| NEUTRAL HYDROGEN ABSORPTION IN THE Irr II GALAXY M82, |
1970 |
|
| Authors:
M. Guelin; L. Weliachew; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
 | Absorption by neutral hydrogen has been detected in the galaxy M82. Measurements were carried out with the transit radio telescope at Nancay. Emission and absorption do not occur at the same velocities. The velocity and width of the absorption profile are i agreement with emission lines detected previously at optical wavelengths along the major axis and close to the center of the galaxy. The neutral absorbing gas is related to ... |
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| GALACTIC HYDROGEN ABSORPTION AT 21 CM WAVELENGTH IN THE DIRECTION OF VIRGO A, |
1970 |
|
| Authors:
R. S. Colvin; M. P. Hughes; A. R. Thompson; G. L. Verschuur; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The 21 cm optical depth in the direction of Virgo A is 0.017 plus or minus 0.003 near the velocity of the peak of the galactic background emission, and the corresponding gas temperature lies within the range 180 - 460 degrees Kelvin. In the negative-velocity wing of the emission profile the optical depth is less than 0.002 which indicates a minimum gas temperature of 600K. |
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| SYNTHESIS OF THE POLARIZATION PROPERTIES OF 3C10 AND 3C58 AT 1420 AND 2880 MHz, |
1970 |
|
| Authors:
K. W. Weiler; G. A. Seielstad; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| An earth-rotation aperture-synthesis technique was combined with the methods of interference polarimetry to study the total intensity and linear polarization properties of the two radio sources 3C10 and 3C58 with a resolution of approximately one minute of arc at both 1420 and 2880 MHz. These data were then used to calculate the distributions of spectral index, rotation measure, intrinsic position angle, and polarization for the sources. (Author) |
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| A MEASUREMENT OF THE DEFLECTION OF 9.602-GHz RADIATION FROM 3C279 IN THE SOLAR GRAVITATIONAL FIELD, |
1970 |
|
| Authors:
G. A. Seielstad; R. A. Sramek; K. W. Weiler; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| During its occultation by the sun in October 1969, the position of the radio source 3C279 was interferometrically monitored to determine the deviation of its 9.602-GHz radiation in the solar gravitational field. Rapid instrumental calibration and negligible coronal diffraction enabled the measurement of a General Relativity deflection of 1.77 plus or minus 0.20 seconds at the limb of the sun. This is in close agreement with Einstein's prediction. (Author) |
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| A RADIO INTERFEROMETRIC TEST OF THE GENERAL RELATIVISTIC LIGHT BENDING NEAR THE SUN, |
1970 |
|
| Authors:
D. O. Muhleman; R. D. Ekers; E. B. Fomalont; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Radio interferometry was used to measure the deflection of a radio source as it passed the Sun. This deflection is a separable combination of refraction in the coronal electron plasma and the General Relativistic effect. The observed inverse distance component was 1.04(+0.15/-0.10) of that predicted by Einstein's theory of General Relativity. The observation also yielded a reasonable value for the coronal electron density. (Author) |
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| OPTICAL IDENTIFICATION OF RADIO SOURCES SELECTED FROM THE 4C CATALOG, |
1970 |
|
| Authors:
E. T. Olsen; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| A total of 490 radio positions having an average error of plus or minus 20 seconds in both coordinates have been studied optically in an attempt to identify the sources. The radio sources were selected from the 4C catalog and the optical search was carried out on the Palomar Sky Survey prints. Approximately one-third of the 204 identifications proposed here are quasi-stellar objects. There is evidence that the plate limit ... |
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| POLARIZED BRIGHTNESS DISTRIBUTION FOR 3C20, |
1970 |
|
| Authors:
Edward B. Fomalont; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| High resolution maps at 2695 MHz using the NRAO three-element interferometer have been obtained for the linearly polarized and total radiation of 3C20. The total radiation shows a common structure composed of two unresolved components with larger-scale radiation between them. The polarized distribution shows good correspondence with the total distribution. The intense components are only slightly polarized while the central regions have polarizations as large as 20 percent. (Author) |
|
| AN ATTEMPT AT RADIO OBSERVATION OF Ap STARS, |
1970 |
|
| Authors:
Keiichi Kodaira; Edward B. Fomalont; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Twelve Ap stars were observed with a radio interferometer at 6.2 cm wavelength. An upper limit of radio flux was found for all of the stars. The absence of radio emission indicates a relatively steady electromagnetic nature for Ap stars. The amount of synchrotron radiation possible cannot produce the variable light and color of these stars. (Author) |
|
| AN ATTEMPT TO DETECT NEUTRAL HYDROGEN IN PLANETARY NEBULAE, |
1969 |
|
| Authors:
A. R. Thompson; R. S. Colvin; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Six planetary nebulae were observed at the frequency of the 21 cm hydrogen line in an attempt to detect absorption of the thermal radio emission in neutral hydrogen in the outer parts of the nebulae. No evidence of such neutral gas was detected, and in two cases an upper limit of 0.12 solar mass can be placed on the HI mass if the observations are interpreted in terms of a ... |
|
| COMPACT RADIO SOURCE IN THE NUCLEUS OF M 87, |
1969 |
|
| Authors:
M. H. Cohen; A. T. Moffet; D. Shaffer; B. G. Clark; K. I. Kellermann; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The compact radio source in M 87 has been observed with a long baseline interferometer composed of the 210-foot telescope at Goldstone, California, U.S.A., and the 85-foot telescope at Tidbinbilla, near Canberra, A.C.T., Australia. The observations suggest that the radio source is remarkably concentrated to the galactic nucleus and has a linear diameter of about 2.5 light months. |
|
| THE 21 CM ABSORPTION PROFILES OF DR 21 AND THE SOURCE NEAR NGC 6857, |
1969 |
|
| Authors:
A. R. Thompson; R. S. Colvin; M. P. Hughes; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The 21 cm absorption profiles of two dense thermal sources, DR 21 and the source near NGC 6857 have been obtained using the interferometer at the Owens Valley Radio Observatory. DR 21 shows absorption over a range of radial velocities from +18 to -20 km/sec (with respect to the local standard of rest), although on the basis of the observed radial velocity and the usual model for galactic rotation one ... |
|
| POLARIZATION OF PULSATING RADIO SOURCES (8), |
1969 |
|
| Authors:
R. D. Ekers; A. T. Moffet; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The complete polarization characteristics of a number of pulsating radio sources have been determined at 13 cm. Both a stable average and a time varying component of the polarized radiation were found. A change in the position angle of the linear component during the course of the pulse is a common property; however the high degree of linear polarization and constant rotation of angle seen for PSR0833-45 is atypical. (Author) ... |
|
| THE NATURE OF THE FAR INFRARED RADIATION OF THE GALACTIC CENTER (7), |
1969 |
|
| Authors:
James Lequeux; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The strong far-infrared emission discovered at the galactic center by Hoffmann and Frederick (1968) is shown to be probably emission by dust particles; the large total mass of these particles suggests that the mass of the interstellar medium at the center of the Galaxy may be larger than indicated by the 21 cm line observations. (Author) |
|
| CIRCULAR POLARIZATION MEASUREMENTS OF COMPACT RADIO SOURCES AT 1420 MHz. INTERFEROMETRIC OBSERVATIONS OF THE RADIO SOURCE VRO 42 22 01, |
1969 |
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| Authors:
G. A. Seielstad; K. B. Yip; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| E CIRCULAR POLARIZATION OF SEVENTEEN SMALL-DIAMETER RADIO SOURCES HAS BEEN MEASURED AT A FREQUENCY OF 1420 MHz. None had detectable polarization, although for some sources independent measurements made at different frequencies agreed as to the sense of circular polarization. The position of VRO 42 22 01 has been measured to an accuracy of 2 in. Its diameter at 9.6 GHz is < 2 in. The flux density varies at frequencies ... |
|
| DISCOVERY OF AN INTENSE OH EMISSION SOURCE, |
1969 |
|
| Authors:
b. eliasson; J. F. Bartlett; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| This letter reports the discovery of a bright OH emission source at 1612.231 MHz in the constellation Canis Major. The source was discovered with the Owens Valley interferometer in October, 1968. There is a bright infrared object listed close to the position of the source in the Caltech catalog of infrared stars (Neugebauer and Leighton 1968). This infrared object has been identified with an irregular variable, VY Canis Majoris. (Author) ... |
|
| A MEASUREMENT OF THE GALACTIC MAGNETIC FIELD USING THE PULSAR PSR 0833-45, |
1969 |
|
| Authors:
R. D. Ekers; J. Lequeux; A. T. Moffet; G. A. Seielstad; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The radiation from PSR 0833-45 is strongly linearly polarized. Measurements at 21, 18 and 13 cm show a rotation measure of +33 + or - 5 radian/sq m. Combined with the published value of the dispersion measure this yields a mean value of 0.73 + or - 0.13 microgauss for the longitudinal component of the galactic magnetic field along the inner face of the Orion arm. (Author) |
|
| A GENERAL DISCUSSION OF THE BRIGHTNESS DISTRIBUTION OF EXTRA-GALACTIC RADIO SOURCES. 3, |
1969 |
|
| Authors:
Edward B. Fomalont; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The paper contains a description and discussion of the brightness distribution of extra-galactic radio sources based mainly on recent observations at the California Institute of Technology. The paper concentrates on displaying general properties of radio sources rather than a discussion of individual sources. The angular scale and the morphological types of radio structures are discussed, a method for analyzing the structure of a large sample of sources using the visibility ... |
|
| HIGH RESOLUTION OBSERVATIONS OF RADIO SOURCES. 4, |
1969 |
|
| Authors:
Marshall H. Cohen; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Three principal methods are used to obtain high angular resolution at radio wavelengths: interferometry, lunar occultations, and interplanetary scintillations. These methods are reviewed and compared. Typical results are presented. A general tabulation of all interferometric results at resolution higher than one second of arc is also included. (Author) |
|
| POLARIZATION MEASUREMENTS OF EXTRAGALACTIC RADIO SOURCES AT 3.12 CM WAVELENGTH. 2, |
1969 |
|
| Authors:
G. L. Berge; G. A. Seielstad; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The two-element interferometer at the Owens Valley Radio Observatory was used in late 1967 to measure the integrated polarization, both linear and circular, of 32 extragalactic radio sources at a wavelength of 3.12 cm. In addition, flux densities of 103 radio sources were also measured. (Author) |
|
| ONE-DIMENSIONAL POLARIZATION DISTRIBUTIONS OVER FOUR SUPERNOVA REMNANTS AT 1418 MHZ, |
1968 |
|
| Authors:
G. A. Seielstad; K. W. Weiler; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Distributions of the linearly polarized radiation at a frequency of 1418 MHz from the four supernova remnants 3C 10 (Tycho's supernova), Taurus A (Crab Nebula), 3C358 (Kepler's supernova), and Cassiopeia A have been determined by synthesizing a fan beam whose small dimension is along a circle of constant declination. In addition, extremely low upper limits have been placed on the net degree of circular polarization in the integrated radiation from ... |
|
| FURTHER OBSERVATIONS OF PULSATING RADIO SOURCES AT 13 CM, |
1968 |
|
| Authors:
R. D. Ekers; A. T. Moffet; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Four pulsars, CP0834, CP0950, CP1133 and CP1919 have been observed at 13 cm with the 210 ft antenna of the J.P.L. Goldstone tracking station. Comparison of the 13 cm intensities with those observed elsewhere at longer wavelengths shows that two have definite cutoffs near 30 cm while one, CP1133 has a power-law spectrum. Pulse shapes are similar to those observed at 74 cm, except that the second component in CP1133 ... |
|
| EAST-WEST LINEAR POLARIZATION DISTRIBUTIONS OF RADIO GALAXIES AT 1418 MHz, |
1968 |
|
| Authors:
G. A. Seielstad; K. W. Weiler; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The distributions along a circle of constant declination of the linearly polarized radiation at a frequency of 1418 MHz from 68 extragalactic radio sources were examined. The effective resolution was about 0.8. At places within many sources very high degrees of polarization (> 15 per cent), usually accompanied by a constant plane of polarization, were found. Both facts imply the existence of a highly ordered magnetic field. Often other regions ... |
|
| HIGH-RESOLUTION INTERFEROMETRY OF VENUS AT 3.12-CM WAVELENGTH, |
1968 |
|
| Authors:
Glenn L. Berge; Eric W. Greisen; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The two-element interferometer at the Owens Valley Radio Observatory was used in September, 1967, to measure the 3-cm brightness and polarization distributions of Venus near inferior conjunction. The limbs were found to be unpolarized to a very low upper limit. Limb-darkening was observed, but no departures from circular symmetry could be detected. Apparently the Venus atmosphere supplies most of the radiation observed at this wavelength. Venus was also observed briefly ... |
|
| RADIO SOURCES AND ELLIPTICAL GALAXIES. |
1968 |
|
| Authors:
David H. Rogstad; Ronald D. Ekers; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| One hundred ninety-one E and SO non-cluster galaxies with known redshift have been surveyed for radio emission at a frequency of 2640 MHz. The observations support the hypothesis that an elliptical galaxy must have an absolute photographic magnitude brighter than -20 to be a strong radio source. A comparison of the results of this survey with observations of radio galaxies in rich clusters indicates that cluster membership does not enhance ... |
|
| POSITIONS AND STOKES PARAMETERS OF SEVEN OH EMISSION SOURCES, |
1968 |
|
| Authors:
Ernst Raimond; Baldur Eliasson; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The two-element variable baseline interferometer of the Owens Valley Radio Observatory has been used to determine positions of the OH sources near the galactic radio sources W3, Ori A, NGC6334, Sgr B2, W49, W51 and W75. The accuracy of the absolute positions is 4 sec. to 6 sec., that of relative positions of different features belonging to one source is approximately 3 sec. The relative distances between different components of ... |
|
| EAST-WEST FOURIER TRANSFORMS OF POLARIZATION PARAMETERS OF RADIO SOURCES AT 1418 MHz, |
1968 |
|
| Authors:
G. A. Seielstad; K. W. Weiler; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| As part of a continuing study employing the Owens Valley Radio Observatory's twin-element interferometer to provide high angular resolution measurements of the various radio source properties the Fourier transforms of the distributions of the Stokes parameters Q, U, and V were measured at several antenna spacings along an east-west baseline. The present paper catalogs these measurements, while a subsequent paper will interpret them in terms of the structure of the ... |
|
| ACCURATE POSITIONS OF SELECTED 4C SOURCES, |
1967 |
|
| Authors:
E. T. Olsen; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Positions and flux densities at 1417 MHz of 490 radio sources have been measured using the two 90-ft steerable paraboloids at the Owens Valley Radio Observatory as an east-west and a north-south interferometer. After confusion has been taken into account, most of the positions are accurate to within plus or minus 20 sec. in each coordinate and most flux densities to within plus or minus 0.1 f.u. (Author) |
|
| THE EAST-WEST STRUCTURE OF RADIO SOURCES AT 1425 MHZ, |
1967 |
|
| Authors:
E. B. Fomalont; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The east-west brightness distribution of over 500 radio sources, 200 of them resolved, are given in tabular and graphical form. The observations were taken with the Caltech twin-element interferometer at a frequency of 1425 MHz. Nine separations from 144 wavelengths to 2626 wavelengths were used to synthesize an east-west fan beam of 45 seconds of arc. |
|
| RADIO MEASUREMENTS OF PLANETARY NEBULAE, |
1967 |
|
| Authors:
A. R. Thompson; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Sixty-eight planetary nebulae were investigated in a series of observations at 10 cm wavelength using the two 90-ft. diameter antennas of the Owens Valley Radio Observatory. Of these, fifty-two were found to have flux densities greater than a minimum detectable level of approximately 10 to the -27th power W/Hz m squared. To indicate cases of possible confusion in the radio observations, the measured radio position of each nebula was compared ... |
|
| A CATALOG OF THE EAST-WEST VISIBILITY FUNCTIONS OF RADIO SOURCES AT 1425 MHZ. |
1967 |
|
| Authors:
E. B. Fomalont; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| As part of a general program for determining the radio structure of discrete sources, 532 sources have been observed using the two 90-foot paraboloids at the Owens Valley Radio Observatory as an east-west interferometer. The frequency of the observations was 1425 MHz and up to nine east-west spacings, ranging from 144 wavelengths to 2626 wavelengths, were used. (Author) |
|
| ON THE POSSIBILITY OF SELECTING QUASI-STELLAR GALAXIES FROM BLUE STARS BY OBSERVATIONS IN THE NEAR INFRARED, |
1967 |
|
| Authors:
Alessandro Braccesi; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| It is known that a certain fraction of the high-galactic-latitude, faint, blue 'stars' are objects with the same optical properties as the quasi-stellar sources. The possibility of selecting these objects from the white dwarfs by observations in the near infrared is shown. (Author) |
|
| NEUTRAL HYDROGEN STUDIES OF GALAXIES WITH A SINGLE SPACING INTERFEROMETER, |
1967 |
|
| Authors:
D. H. Rogstad; G. W. Rougoor; J. B. Whiteoak; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| A total of 79 galaxies were investigated with the Owens Valley Observatory's two-element interferometer for content of neutral hydrogen. The baseline used was 100 ft east-west, and the filter bandwidth was 100 kHz. Thirty of the galaxies had detectable emission. The results are presented as line and position profiles for each galaxy. An extensive investigation of model profiles is also presented for the purposes of interpretation of the observed results. ... |
|
| 2800 RADIO EMISSION FROM ELEVEN QUASI-STELLAR GALAXIES, |
1967 |
|
| Authors:
Alessandro Braccesi; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Recently Sandage and Luyten were able to identify eleven quasi-stellar galaxies in a field of the Palomar Observatory-National Geographic Society Sky Survey. The objects have been selected on the basis of their optical properties alone. Thus the sample is unbiased with respect to the radio emission of the objects. A search in the 4C catalog shows that none of the objects is brighter than 2 . 10 to the -26th ... |
|
| NEW DETERMINATIONS OF THE FARADAY ROTATION FOR EXTRAGALACTIC RADIO SOURCES, |
1966 |
|
| Authors:
G. L. Berge; G. A. Seielstad; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Data are presented on the linear polarization properties of 42 radio sources at 18.0-cm wavelength. These are combined with data obtained previously at other wavelengths to obtain rotation measures. The dependence of all reliable rotation measures on the galactic coordinates is interpreted in terms of the magnetic field within the local spiral arm. (Author) |
|
| THE RADIO SOURCE 3C 17, |
1966 |
|
| Authors:
A. T. Moffet; M. Schmidt; C. H. Slater; A. R. Thompson; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The position of the radio source 3C 17 is derived from 9 occultation events recorded at three observatories. The positional accuracy is about 0.5 second, and a 19th magnitude galaxy is found within 1 second of the radio position. Occultation and interferometric measurements indicate that the source is probably of the corehalo type, with a maximum diameter of 20-30 seconds. The optical spectrum of the galaxy shows emission lines typical ... |
|
| MEASUREMENTS OF THE FLUX DENSITIES, POSITIONS AND ANGULAR WIDTHS OF PLANETARY NEBULAE AT 10 CM AND 21 CM WAVELENGTHS, |
1966 |
|
| Authors:
A. R. Thompson; R. S. Colvin; G. J. Stanley; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Observations of 36 planetary and two diffuse nebulae have been made using the two 90-ft diameter antennas. The effects of confusion with non-thermal radio sources were examined statistically. In addition some indication of the nebulae for which confusion is most serious was obtained from a comparison of the radio positions with optical positions. Errors in the flux density measurements resulting from confusion should be small at 10 cm but are ... |
|
| POSITIONS FOR 3C REVISED RADIO SOURCES, |
1966 |
|
| Authors:
E. B. Fomalont; J. D. Wyndham; J. F. Bartlett; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Positions for 275 radio sources, mainly from the 3C Revised Catalog, have been measured with the Owens Valley interferometer as part of a program to identify radio sources with optical objects. The observations were made at a frequency of 1421 MHz. (Author) |
|
| OCCULTATION OF THE CRAB NEBULA BY THE SOLAR CORONA IN JUNE 1963, |
JUN 1963 |
|
| Authors:
J. D. Wyndham; B. G. Clark; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Observations of the Crab Nebula were undertaken in June 1963 using the twin 90-ft dishes of the California Institute of Technology's Owens Valley Radio Observatory. The two antennae were employed as an east-west interferometer of spacing 680 wavelength operating at a frequency of 1660 Mc/s (18 cm wavelength). Any increase in angular diameter of the source, observed with interferometer, results in a decrease in the recorded source response which may ... |
|
| LINEAR POLARIZATION MEASUREMENTS OF THE DECIMETER WAVELENGTH RADIATION FROM SMALL DIAMETER RADIO SOURCES, |
1963 |
|
| Authors:
CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
|
| OBSERVATIONS OF THE CALIFORNIA INSTITUTE OF TECHNOLOGY RADIO OBSERVATORY, OWENS VALLEY, CALIFORNIA 1961. 4. BRIGHTNESS DISTRIBUTION IN DISCRETE RADIO SOURCES. I. OBSERVATIONS WITH AN EAST-WEST INTERFEROMETER |
1961 |
|
| Authors:
Alan T. Moffet; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The Caltech variable baseline interferometer was used in a program of brightness distribution measurements on 195 discrete radio sources at a wavelength of 31.3 cm. This paper reports measurements, made with an east-west interferometer baseline, of the complex visibility functions of 127 sources. The amplitude and phase of the visibility functions were measured at transit with antenna spacings of 195, 389, 779, and 1557 lambda. Using these same basic spacings, ... |
|
| THE BRIGHTNESS DISTRIBUTION IN EXTRAGALACTIC RADIO SOURCES |
1961 |
|
| Authors:
A.T. MOFFET; P. Maltby; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Efforts are presented on a continuing program of angular size and brightness distribution measurements. One hundred eighty radio sources were observed with the variable spacing interferometer at the Owens Valley Radio Observatory. Results are presented for a group of 88 sources which were observed with both an east-west and a north-south baseline. All observations were made at a wavelength of 31.3 cm. (Author) |
|
| THE CENTRAL COMPONENT OF THE RADIO SOURCE CENTAURUS A |
1961 |
|
| Authors:
P. Maltby; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
|
| THE HYDROGEN LINE IN ABSORPTION |
1961 |
|
| Authors:
B.G. CLARK; V. Radhakrishnan; R.W. WILSON; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Twenty-one-cm absorption spectra have been obtained for 12 radio sources using conventional techniques. Six of these sources were also studied with a hydrogen-line interferometer. Differences in the profiles obtained by the 2 methods give information on the structure and temperature of the HI clouds seen in absorption. Estimates of the angular sizes of 4 clouds based on these differences lead to an average diameter of 13 parsecs. In some cases ... |
|
| OBSERVATIONS OF THE CALIFORNIA INSTITUTE OF TECHNOLOGY RADIO OBSERVATORY, OWENS VALLEY, CALIFORNIA 1961. 6. THE RADIO SPECTRUM OF SUPERNOVA REMNANTS |
1961 |
|
| Authors:
D.E. HARRIS; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| 960 Mc/s observations of thirteen galactic sources generally assumed to be supernova remnants, are coupled with previous observations at other frequencies to derive spectral indices.Although several values of spectral index are found in the neighborhood of zero, arguments are presented that free-free transitions are not the primary cause of the radio emission. An interpretation of the relatively large range of spectral indices is suggested on the basis of an evolutionary ... |
|
| OBSERVATIONS OF THE CALIFORNIA INSTITUTE OF TECHNOLOGY RADIO OBSERVATORY, OWENS VALLEY, CALIFORNIA 1961. 5. BRIGHTNESS DISTRIBUTION IN DISCRETE RADIO SOURCES. II. OBSERVATIONS WITH A NORTH-SOUTH INTERFEROMETER |
1961 |
|
| Authors:
P. Maltby; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| The brightness distribution in 165 radio sources was obtained at a wavelength of 31.3 cm. The measurements were made with the variable spacing interferometer at the Owens Valley Radio Observatory using a north-south baseline. Primary sets of observations, giving the visibility amplitude and the phase, were taken at transit at four different antenna spacings. Additional information about the brightness distribution was obtained from observations at large hour angles, using the ... |
|
| RADIO EMISSION FROM JUPITER AT A WAVELENGTH OF 31 CM |
1959 |
|
| Authors:
J.A. ROBERTS; G.J. STANLEY; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Radio emission from Jupiter was measured at a wavelength of 31 cm. The mean equivalent disk temperature is 5.5 x 1000 K. Two possible sources of the radiation are discussed: freefree transitions in a Jovian corona, and synchrotron emission from a Jovian van Allen belt. (Author) |
|
| POSITIONS AND SUGGESTED IDENTIFICATIONS FOR THE RADIO STARS HYDRA-A AND HERCULES-A |
1959 |
|
| Authors:
J.A. ROBERTS; J.G. BOLTON; D.E. HARRIS; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| Position measurements of two radio stars confirm the identification of Hydra-A with a close pair of galaxies and suggest that Hercules-A may be a very distant elliptical. (Author) |
|
| A STUDY OF CENTAURUS-A/NGC 5128 AT 31 CM |
1959 |
|
| Authors:
J.G. BOLTON; B.G. CLARK; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
| A study of Centaurus-A/NGC 5128 at 960 mc shows that the radio extensions are visible in the decimeter wavelength range as well as at meter wavelengths. A comparison of the results at 960 mc and 85 mc shows that the brightness distributions are very similar, thus the spectrum of the radio emission is independent of the region of emission. The brightness distribution can be clearly separated into at least three ... |
|
| ON THE LINEAR POLARIZATION OF THE RADIATION FROM RADIO SOURCES, |
1944 |
|
| Authors:
G. A. Seielstad; D. Morris; V. Radhakrishnan; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
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| By combining all available data, information on the polarization characteristics of about 30 sources is summarized in a table. Source designation and its position in Galactic coordinates, the polarization properties of the sources, and other source properties which are of interest when discussing their linear polarization are tabulated. (Author) |
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| COMPONENT SHAPES IN DOUBLE RADIO SOURCES, |
1944 |
|
| Authors:
Alan T. Moffet; CALIFORNIA INST OF TECH PASADENA OWENS VALLEY RADIO OBSERVATORY
|
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Reports by Corporate Author
