J/ApJS/135/227 The FIRST bright quasar survey. III. (Becker+, 2001)
The FIRST bright quasar survey. III. The South Galactic Cap.
Becker R.H., White R.L., Gregg M.D., Laurent-Muehleisen S.A.,
Brotherton M.S., Impey C.D., Chaffee F.H., Richards G.T., Helfand D.J.,
Lacy M., Courbin F., Proctor D.D.
<Astrophys. J. Suppl. Ser. 135, 227 (2001)>
=2001ApJS..135..227B 2001ApJS..135..227B
ADC_Keywords: Radio sources ; QSOs ; BL Lac objects ; Galaxies, radio ;
H II regions ; Magnitudes
Keywords: BL Lacertae objects: general - galaxies: active -
galaxies: starburst - quasars: general - radio continuum: galaxies -
surveys
Abstract:
We present the results of an extension of the FIRST Bright Quasar
Survey (FBQS) to the South Galactic cap, and to a fainter optical
magnitude limit. Radio source counterparts with SERC R magnitudes
brighter than 18.9 which meet the other FBQS criteria are included. We
supplement this list with a modest number of additional objects to
test our completeness for quasars with extended radio morphologies.
The survey covers 589deg2 in two equatorial strips in the southern
cap. We have obtained spectra for 86% of the 522 candidates and find
321 radio-selected quasars of which 264 are reported here for the
first time. A comparison of this fainter sample with the FBQS sample
shows the two to be generally similar. Fourteen new broad absorption
line (BAL) quasars are included in this sample. When combined with the
previously identified BAL quasars in our earlier papers, we can
discern a break in the frequency of BAL quasars with radio loudness,
namely that the relative number of high-ionization BAL quasars drops
by a factor of 4 for quasars with a radio-loudness parameter R*>100.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 109 321 *FIRST Bright Quasar Catalog
table2.dat 101 31 Narrow-line AGN in FBQS candidate list
table3.dat 105 23 BL Lacertae objects in FBQS candidate list
table4.dat 99 23 H II region galaxies in FBQS candidate list
table5.dat 99 17 Passive galaxies in FBQS candidate list
table6.dat 101 32 Stars in FBQS candidate list
table7.dat 114 75 Objects without spectra in FBQS candidate list
table8.dat 62 14 Broad Absorption-Line quasars
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Note on table1.dat: All objects are defined as in Simbad.
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See also:
VIII/59 : The FIRST Survey, version 1999Jul (White+ 1999)
J/AJ/112/407 : The FIRST bright QSO survey. I. (Gregg+, 1996)
J/ApJS/126/133 : The FIRST bright quasar survey. II. (White+, 2000)
J/AJ/121/1872 : The FIRST radio-selected QSOs (Helfand+, 2001)
Byte-by-byte Description of file: table[1-7].dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension (J2000)
4- 5 I2 min RAm Right Ascension (J2000)
7- 12 F6.3 s RAs Right Ascension (J2000)
14 A1 --- DE- Sign of the Declination (J2000)
15- 16 I2 deg DEd Declination (J2000)
18- 19 I2 arcmin DEm Declination (J2000)
21- 25 F5.2 arcsec DEs Declination (J2000)
27- 28 A2 --- s/g Optical morphology in the APM catalog (1)
30- 34 F5.2 mag Rmag The APM R plate magnitude (2)
36- 40 F5.2 mag Bmag The APM B plate magnitude (2)
42- 46 F5.2 mag B-R Extinction-corrected APM (B-R) color (2)
48- 51 F4.2 mag AR The APM R band extinction correction (3)
53- 57 F5.2 arcsec Sep Separation between radio and optical positions
59- 65 F7.2 mJy Speak FIRST 20cm peak flux density
67- 73 F7.2 mJy Sint FIRST 20cm integrated flux density
75- 79 F5.1 mag BMAG ? The absolute B magnitude
81- 84 F4.1 [mW/m2/Hz] logLR ? Log of radio luminosity at a rest-frame
frequency of 5GHz in units of
ergs/cm2/s/Hz (4)
86- 90 F5.2 --- logR* ? K-corrected 5 GHz radio to 2500Å optical
luminosity ratio (5)
92- 96 F5.3 --- z ? Redshift
98-108 A11 --- Notes Individual object notes (6)
110-113 F4.2 --- ProbQ ? Probability that candidate is a quasar (7)
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Note (1): Optical morphology:
* = stellar on both plates;
gR = nonstellar on R plate;
gB = nonstellar on B plate.
Note (2): Magnitudes are extinction corrected. Note that magnitudes
are unreliable for objects brighter than ∼15th magnitude (Paper II).
Note (3): Computed as 2.7E(B-V) using the extinction maps of
Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S). The correction for B is
4.3E(B-V)=1.59AR.
Note (4): Assuming spectral index α=-0.5(Fν ∝ να)
Note (5): Using the definition of Stocke et al. (1992ApJ...396..487S 1992ApJ...396..487S).
Note (6): the symbols have the following meaning:
o = Previously known QSO (table1.dat) or AGN (table2.dat) or
BL Lac object (table3.dat) or galaxy (table5.dat) from
NASA Extragalactic Database (NED) or
from Veron-Cetty & Veron (1998, Cat. VII/215) catalog.
new z = Newly determined redshift for previously known object.
No spec = A previously known quasar for which no spectrum appears in Fig. 9
DBL = Object included in sample as central-component of core-less
double
CJ = Object included in sample as match to core-jet source.
X = X-ray source in ROSAT BSC (Voges et al., 1996, Cat. IX/10).
I = Infrared source in IRAS FSC (Moshir et al., 1992, Cat. II/156)
HiBAL = Object shows broad absorption lines from high-ionization elements
dmpLα = Object shows damped Lyα absorption
? = Quasar classification is considered uncertain (table3.dat)
In table1.dat, Notes followed by ``?'' are objects that fail the
`balnicity'' test (Weymann et al., 1991ApJ...373...23W 1991ApJ...373...23W) but may
nonetheless be a BAL.
Note (7): For table7.dat only. Computed as described in Paper II.
All source parameters including color were used.
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right ascension (J2000)
4- 5 I2 min RAm Right ascension (J2000)
7- 12 F6.3 s RAs Right ascension (J2000)
14 A1 --- DE- Declination sign (J2000)
15- 16 I2 deg DEd Declination (J2000)
18- 19 I2 arcmin DEm Declination (J2000)
21- 25 F5.2 arcsec DEs Declination (J2000)
27- 31 F5.1 mag BMAG Absolute B magnitude
33- 36 F4.1 [mW/m2/Hz] logLR Log of radio luminosity at a rest-frame
frequency of 5 GHz
38- 41 F4.2 --- logR* K-corrected 5 GHz radio to 2500Å
optical luminosity ratio
43- 47 F5.3 --- z Redshift
49- 52 I4 --- BAL BALnicity index (1)
53 A1 --- n_BAL [b] BAL computed from MgII lines (2)
55- 62 A8 --- Note Notes
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Note (1): BALnicity index, (Weymann et al., 1991ApJ...373...23W 1991ApJ...373...23W), which
if nonzero indicates high confidence that the absorption is a true
broad-absorption line rather than associated absorption.
Note (2): b: BALnicity was computed from Mg II, which generally is
narrower than the high-ionization lines.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 10-Sep-2001