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VLA observations at 333 MHz: A Search for pancakes

Published online by Cambridge University Press:  12 April 2016

Juan M. Uson ,
Durgadas S. Bagri  and
T. J. Cornwell
Juan M. Uson
Affiliation:
National Radio Astronomy Observatory, P.O. Box. 0, Socorro, NM 87801
Durgadas S. Bagri
Affiliation:
National Radio Astronomy Observatory, P.O. Box. 0, Socorro, NM 87801
T. J. Cornwell
Affiliation:
National Radio Astronomy Observatory, P.O. Box. 0, Socorro, NM 87801

Abstract

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The P-band is the most recently completed observing band at the VLA. The aperture efficiency of the antennas is 0.4 and the system temperature is ∼ 130 K. The primary beam is slightly off-axis and its half-power width is steeply frequency dependent, which induces abnormal spectral indices on off-axis (≥ 1°) sources. We have searched for Zel’dovich “pancakes” and reached a level of ΔSrms ∼ 3.5 mJy for spectral channels of width Δν ∼ 100 kHz. We find no pancake with MHI ≳5 × 1014 M⊙.

Type
Imaging
Information
International Astronomical Union Colloquium , Volume 131: Radio Interferometry: Theory, Techniques, and Applications , 1991 , pp. 223 - 227
Copyright
Copyright © Astronomical Society of the Pacific 1991

References

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Sunyaev, R.A. & Zel’dovich, Ya.B. 1975, M.N.R.A.S., 171, 375.CrossRefGoogle Scholar
Zel’dovich, Ya.B. 1970, Astr. Ap., 5, 84.Google Scholar