J/AJ/118/1435 VLA FIRST survey quasar radio emission (Wadadekar+, 1999)
A study of quasar radio emission from the VLA FIRST survey
Wadadekar Y., Kembhavi A.
<Astron. J. 118, 1435 (1999)>
=1999AJ....118.1435W 1999AJ....118.1435W
ADC_Keywords: QSOs ; Radio continuum ; Redshifts ; Surveys
Keywords: catalogs - methods: statistical - quasars: general - surveys
Abstract:
Using the most recent (1998) version of the VLA FIRST survey radio
catalog, we have searched for radio emission from 1704 quasars taken
from the most recent (1993, Cat. VII/158) version of the Hewitt &
Burbidge quasar catalog. These quasars lie in the roughly 5000 deg2 of
sky already covered by the VLA FIRST survey. Our work has resulted in
positive detection of radio emission from 389 quasars, of which 69
quasars have been detected for the first time at radio wavelengths. We
find no evidence of a correlation between optical and radio
luminosities for optically selected quasars. We find indications of a
bimodal distribution of radio luminosity, even at a low flux limit of
1 mJy. We show that radio luminosity is a good discriminant between
radio-loud and radio-quiet quasar populations, and that it may be
inappropriate to make such a division on the basis of the
radio-to-optical luminosity ratio. We discuss the dependence of the
radio-loud fraction on optical luminosity and redshift.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 91 436 FIRST detections of quasars
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See also:
VIII/59 : the FIRST Survey, version 1999Jul (White+ 1999)
http://sundog.stsci.edu : FIRST
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name *IAU designation
10- 12 A3 --- Sel *[ORCXU ] Selection technique
14- 18 F5.2 mag Pmag ? Photographic magnitude
20- 27 F8.2 mJy F1.4GHz 1.4GHz peak radio flux
29- 32 F4.2 --- z Redshift
34- 36 F3.1 arcsec Sep Separation with the FIRST source
38- 46 A9 --- Names Alternative designation
48- 91 A44 --- Radio Recent radio detection
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Note on Name:
The name is based on B1950 position, a 'B' should therefore
be added in front of the name.
Note on Sel: the following symbols are used:
O: objective prism
R: radio
C: UV-excess
X: X-ray
U: selection technique not mentioned
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History: From AJ electronic version
* 14-Jan-2002: ReadMe corrected (IAU name based on B1950 position)
(End) James Marcout, Patricia Bauer [CDS] 30-Nov-1999