J/AJ/112/407 The FIRST bright QSO survey (Gregg+, 1996)
The FIRST bright QSO survey.
Gregg M.D., Becker R.H., White R.L., Helfand D.J., McMahon R.G., Hook I.M.
<Astron. J. 112, 407 (1996)>
=1996AJ....112..407G 1996AJ....112..407G
ADC_Keywords: QSOs ; Radio sources ; Photometry ; Redshifts
Abstract:
The FIRST radio survey provides a new resource for constructing a
large quasar sample. With source positions accurate to better than
1" and a point source sensitivity limit of 1mJy, it reaches 50 times
deeper than previous radio catalogs. We report here on the results of
the pilot phase for a FIRST Bright Quasar Survey (FBQS). Based on
matching the radio catalog from the initial 300°2 of FIRST
coverage with the optical catalog from the Automated Plate Machine
(APM) digitization of Palomar Sky Survey plates, we have defined a
sample of 219 quasar candidates brighter than E=17.50. We have
obtained optical spectroscopy for 151 of these and classified 25
others from the literature, yielding 69 quasars or Seyfert 1 galaxies,
of which 51 are new identifications. The brightest new quasar has an
E magnitude of 14.6 and z=0.91; four others are brighter than E=16.
The redshifts range from z=0.12 to 3.42. Half of the detected objects
are radio quiet with L21-cm<1032.5ergs/s. We use the results of
this pilot survey to establish criteria for the FBQS that will produce
a quasar search program which will be 70% efficient and 95% complete
to a 21-cm flux density limit of 1.0mJy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 69 FIRST Survey Bright QSOs
table2.dat 68 32 Emission Line Galaxies
table3.dat 70 41 Absorption Line Galaxies
table4.dat 68 31 Stars
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See also:
VIII/59 : The FIRST Survey, version 1999Jul (White+ 1999)
J/AJ/118/1435 : VLA FIRST survey quasar radio emission (Wadadekar+, 1999)
J/ApJS/126/133 : The FIRST bright quasar survey. II. (White+, 2000)
J/ApJS/135/227 : The FIRST bright quasar survey. III. (Becker+, 2001)
Byte-by-byte Description of file: table?.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- 11 F5.2 s RAs Right ascension (J2000)
13 A1 --- DE- Declination sign (J2000)
14- 15 I2 deg DEd Declination (J2000)
17- 18 I2 arcmin DEm Declination (J2000)
20- 23 F4.1 arcsec DEs Declination (J2000)
25- 28 F4.1 mag Bmag O apparent magnitude (blue)
30- 33 F4.1 mag Rmag E apparent magnitude (red)
35- 41 F7.1 mJy S20nuc 20cm nuclear flux density
43- 45 I3 mJy S20tot ? Total 20cm flux density including
radio lobes
46 A1 --- n_S20tot [b-l] Individual notes (1)
48- 52 F5.3 --- z ? Emission line redshift
53 A1 --- u_z Uncertainty flag on z
54 A1 --- n_z [a] a: Previously known QSO
56- 60 F5.2 10-7W/Hz log(L20) ? Inferred radio luminosity for the
nuclear radio source
62- 66 F5.1 mag RMAG ? Absolute E magnitude
68 A1 --- Note [mn] Note about FIRST source (2)
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Note (1): Individual notes, numbered as follows:
b = 0744+2920 = An asymmetric double ∼30" in length
c = 0754+3033: A suggestion of a weak jet ∼15" in length
d = 0802+3335: An asymmetric double ∼60" in extent
e = 0919+2914: A core-jet geometry ∼12" in length
f = 0937+2937: May have a wide separation double ∼120" in length;
if so, then total flux density is 25 mJy.
g = 1103+3014: A double ∼60" in extent
h = 1110+3019: An asymmetric double ∼45" in length
i = 1217+3006: A core-halo morphology ∼50" in diameter
j = 1342+2828: A double ∼40" in extent
k = 1348+2840: A core jet morphology ∼15" in length
l = 1348+3020: A core jet morphology ∼25" in length; possible radio
lobe along the perpendicular axis ∼40" from the core
Note (2): Missing FIRST sources, as follows:
m = not in later versions of FIRST catalog; peak flux = 0.76 mJy
n = Not in later versions of FIRST catalog; peak flux = 0.77 mJy
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Acknowledgements:
We thank H. Andernach for the preparation of the data files.
(End) Patricia Bauer [CDS] 16-May-2000