scholarly journals The early technical development of the VLA

1991 ◽  
Vol 131 ◽  
pp. 160-164 ◽  
Author(s):  
George W. Swenson
Keyword(s):  
Radio Astronomy ◽  
Technical Development ◽  
Large Array ◽  
Astronomy Observatory ◽  
University Of Illinois ◽  
Very Large Array ◽  
Radio Astronomy Observatory ◽  
Leave Of Absence ◽  
The University ◽  
Academic Year

In the spring of 1964, having qualified for a sabbattical leave from the University of Illinois and having recently completed two years as Chairman of the Visiting Committee of the National Radio Astronomy Observatory, I inquired of the NRAO staff as to whether a desk and possibly some augmentation of my University half-salary might be available at Green Bank for the following academic year. Instead I was invited to join the staff as a fulltime employee and to take a coordinating role in the development of the “very large array” as Chairman of the Design Committee. The University granted me a year’s leave of absence which eventually stretched to four years.

scholarly journals Future Spectral Line Research with the VLA

1980 ◽  
Vol 87 ◽  
pp. 627-629
Author(s):  
K. J. Johnston
Keyword(s):  
New Mexico ◽  
Spectral Line ◽  
Radio Astronomy ◽  
Molecular Species ◽  
Large Array ◽  
Astronomy Observatory ◽  
Very Large Array ◽  
Radio Astronomy Observatory ◽  
Optical Telescopes

The Very Large Array (VLA) is presently being constructed on the Plains of San Augustine near Socorro, New Mexico by the National Radio Astronomy Observatory. The purpose for which this instrument is being constructed is to produce “radio images” of resolution comparable to that of large optical telescopes. There have already been several “test” observations, some successful, using the partially completed instrument to study the molecular species of OH, H2O, and NH3 with wide bandwidths (200-1500 kHz).

scholarly journals Comparison of Optical and Radio Positions of Stars

1990 ◽  
Vol 141 ◽  
pp. 513-514
Author(s):  
LV Morrison ◽  
RW Argyle ◽  
Y Requième ◽  
JM Mazurier
Keyword(s):  
Radio Astronomy ◽  
Reference Frames ◽  
Large Array ◽  
Astronomy Observatory ◽  
Very Large Array ◽  
Radio Astronomy Observatory ◽  
Important Link ◽  
Radio Stars

The positions of radio stars measured with respect to the VLBI network of extragalactic sources provides an important link between the optical and extragalactic reference frames. The establishment of this link was brought a stage nearer realization with the publication by Florkowski et al.(1985) of the radio positions of 20 stars measured with the Very Large Array (VLA) of the National Radio Astronomy Observatory, and the publication by Lestrade et al.(1985, 1988) of 10 stars measured with the VLBI network.

scholarly journals High Resolution Maps with the VLA

1983 ◽  
Vol 103 ◽  
pp. 69-78
Author(s):  
R. C. Bignell
Keyword(s):  
New Mexico ◽  
High Resolution ◽  
Radio Astronomy ◽  
Full Time ◽  
Large Array ◽  
Astronomy Observatory ◽  
Very Large Array ◽  
Radio Astronomy Observatory ◽  
Time Operation

The Very Large Array is a radio picture making instrument operated by the National Radio Astronomy Observatory in Socorro, New Mexico. The array, which has been in full time operation for more than 2 1/2 years, operates at four main wavelengths, 1.3, 2.0, 6.0 and 20 cm with achievable resolutions of .05, .08, .25 and 0.8 arc seconds respectively.

scholarly journals Upper Limits on Sub-Arcminute Fluctuations in the CBR

1992 ◽  
Vol 9 ◽  
pp. 333-334
Author(s):  
R. B. Partridge
Keyword(s):  
New Mexico ◽  
Radio Astronomy ◽  
Angular Resolution ◽  
Aperture Synthesis ◽  
Large Array ◽  
Astronomy Observatory ◽  
Very Large Array ◽  
Radio Astronomy Observatory ◽  
Upper Limits

The use of aperture synthesis allows one to search for fluctuations in the CBR on angular scales below 1 arcminute. I report here tentative results of an experiment carried out with E. B. Fomalont, R. Windhorst and J. Lowenthal using the Very Large Array of the National Radio Astronomy Observatory in New Mexico. We used the instrument in its tightest configuration and at a wavelength of 3.6 cm; the corresponding angular resolution was ~10”. We were able to set limits on fluctuations in the CBR on a range of angular scales, 10”-90”, and these are among the most sensitive upper limits on CBR fluctuations yet published.

scholarly journals Radio variability properties for sources at multi-frequencies

2007 ◽  
Vol 3 (S245) ◽  
pp. 251-252
Author(s):  
Y. Liu ◽  
J. H. Fan ◽  
H. G. Wang
Keyword(s):  
Time Series ◽  
Radio Astronomy ◽  
Power Spectral Analysis ◽  
Light Curves ◽  
University Of Michigan ◽  
Astronomy Observatory ◽  
Period Analysis ◽  
Radio Astronomy Observatory ◽  
Power Spectral ◽  
The University

AbstractUsing three radio databases of the university of Michigan Radio Astronomy Observatory (UMRAO), the National Radio Astronomy Observatory (NRAO), and the Metsähovi Observatory, we analyzed the radio light curves by the power spectral analysis and CLEANest method in search for possible periodicity. Multiple periods are found in some sources at multi-frequencies. We adopted the wavelets for period analysis of unevenly sampled time series to search for the evolution of the parameters (period, amplitude) of possible periodicities. Some possible variation of these parameters are found.

scholarly journals Brightness temperature for radio sources

2007 ◽  
Vol 3 (S245) ◽  
pp. 245-246
Author(s):  
J. H. Fan ◽  
Y. Huang ◽  
Y. Liu ◽  
Y. Gao ◽  
T. X. Hua ◽  
...  
Keyword(s):  
Brightness Temperature ◽  
Radio Astronomy ◽  
Radio Sources ◽  
University Of Michigan ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory ◽  
Brightness Temperatures ◽  
The University

AbstractIn this work, using the database of the university of Michigan Radio Astronomy Observatory (UMRAO), we determined the brightness temperatures, TB for a sample of 167 radio sources. The value of TB is in a range of log TB(K) = 10.46 to 20.08, which suggested that the boosting factors are in a range of δ = 0.41 to 41.26.

scholarly journals Observations of Some Radio Sources Previously Identified with Clusters of Galaxies

1967 ◽  
Vol 20 (6) ◽  
pp. 725
Author(s):  
HM Tovmassian ◽  
IG Moiseev
Keyword(s):  
Radio Telescope ◽  
Radio Astronomy ◽  
Astronomical Observatory ◽  
Radio Sources ◽  
Clusters Of Galaxies ◽  
Astronomy Observatory ◽  
Radio Astronomy Observatory ◽  
The University ◽  
East West

The positions of 33 radio sources previously identified with distant clusters of galaxies were remeasured more accurately to check the identifications. Observations were made at 1410 and 2650 MHz with the 210 ft radio telescope of the Australian National Radio Astronomy Observatory at Parkes, and at 408 MHz with the east-west arm of the Mills Cross at the Molonglo Radio Astronomical Observatory of the University of Sydney. It was found that 21 sources are situated within 5 min of arc of the centres of the corresponding clusters.

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