J/ApJ/511/612 Comparison of Radio-loud and Quiet Quasars (Goldschmidt+, 1999)
A Comparison of the Optical Properties of Radio-loud and Radio-quiet Quasars
Goldschmidt P., Kukula M. J., Miller L., Dunlop J. S.
<Astrophys. J. 511, 612 (1999)>
=1999ApJ...511..612G 1999ApJ...511..612G
ADC_Keywords: Galaxies, radio; QSOs; Radio sources; Surveys
Keywords: quasars: general - radio continuum: galaxies - surveys
Abstract:
We have made radio observations of 87 optically selected quasars at 5
GHz with the VLA in order to measure the radio power for these objects
and hence determine how the fraction of radio-loud quasars varies with
redshift and optical luminosity. The sample has been selected from the
recently completed Edinburgh Quasar Survey and covers a redshift range
of 0.3≤z≤1.5 and an optical absolute magnitude range of
(-26.5)≤MB≤(-23.5) (h=1/2, qo=1/2). We have also matched
other existing surveys with the Faint Images of the Radio Sky at
Twenty Centimeters and NRAO VLA Sky Survey radio catalogs and combined
these data so that the optical luminosity-redshift plane is now far
better sampled than before. We have fitted a model to the probability
of a quasar being radio-loud as a function of absolute magnitude and
redshift, and from this model we infer the radio-loud and radio-quiet
optical luminosity functions. The radio-loud optical luminosity
function is featureless and flatter than the radio-quiet one. It
evolves at a marginally slower rate if quasars evolve by density
evolution, but the difference in the rate of evolutions of the two
different classes is much less than was previously thought.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 84 91 Radio Fluxes and positions for the Edinburgh
Quasars
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Object Edinburgh Quasar Survey name
17 A1 --- n_Name [a] note on Name (1)
23- 24 I2 h RAh Right Ascension (B1950)
26- 27 I2 min RAm Right Ascension (B1950)
29- 33 F5.2 s RAs Right Ascension (B1950)
35 A1 --- DE- Sign of the Declination (B1950)
36- 37 I2 deg DEd Declination (B1950)
39- 40 I2 arcmin DEm Declination (B1950)
42- 45 F4.1 arcsec DEs Declination (B1950)
47- 50 F4.1 mag Bmag ? B band magnitude (2)
52- 56 F5.2 mag B-V ? (B-V) color (2)
58- 64 F7.3 --- z ? Redshift (2)
67 A1 --- l_S5GHz limit on 5GHz
68- 75 F8.3 mJy S5GHz 5 GHz flux density
78 A1 --- l_S8.4GHz limit on 8.4GHz
79- 85 F7.3 mJy S8.4GHz ? 8.4 GHz flux density (3)
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Note (1): The quasar has already been detected by Parkes, MIT, Green Bank,
Texas or Molonglo
Note (2): Columns Bmag, B-V, and z are taken from Goldschmidt 1993
Note (3): The 8.4 GHz flux from Hooper et al. 1995a (1995ApJ...445...62H 1995ApJ...445...62H),
1995b (1995ApJ...473..746H 1995ApJ...473..746H)
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History:
From ApJ electronic edition
February 2000: The redshift of EQS B1317-0033 was changed from
890.0 given in the journal to 0.890 given in SIMBAD.
References: Goldschmidt, P. 1993, Ph.D. thesis, Univ. Edinburgh
(End) Greg Schwarz (AAS) 11-Feb-2000