J/ApJS/175/97 CGRaBS: survey of γ-ray blazar candidates (Healey+, 2008)
CGRaBS: an all-sky survey of gamma-ray blazar candidates.
Healey S.E., Romani R.W., Cotter G., Michelson P.F., Schlafly E.F.,
Readhead A.C.S., Giommi P., Chaty S., Grenier I.A., Weintraub L.C.
<Astrophys. J. Suppl. Ser., 175, 97-104 (2008)>
=2008ApJS..175...97H 2008ApJS..175...97H
ADC_Keywords: Active gal. nuclei ; Radio sources ; Spectroscopy ; Gamma rays
Keywords: BL Lacertae objects: general - galaxies: active - quasars: general -
surveys
Abstract:
We describe a uniform all-sky survey of bright blazars, selected
primarily by their flat radio spectra, that is designed to provide a
large catalog of likely γ-ray active galactic nuclei (AGNs). The
defined sample has 1625 targets with radio and X-ray properties
similar to those of the EGRET blazars, spread uniformly across the
|b|>10° sky. We also report progress toward optical
characterization of the sample; of objects with known R<23, 85% have
been classified and 81% have measured redshifts. One goal of this
program is to focus attention on the most interesting (e.g.,
high-redshift, high-luminosity, ...) sources for intensive
multiwavelength study during the observations by the Large Area
Telescope (LAT) on GLAST.
Description:
The sample selection contents over 11000 flat-spectrum radio sources
with interferometric measurements at ∼1 and 8.4GHz from CRATES catalog
(Healey et al., 2007, Cat. J/ApJS/171/61) and NVSS (Condon et al.,
1998, Cat. VIII/65). To complete the process of optical
identification, we have conducted our own imaging campaign, primarily
at the 5m Hale Telescope at Palomar, the 3.6m New Technology Telescope
(NTT) at La Silla, and the 2.7m Harlan J. Smith Telescope at McDonald.
The great workhorse of our spectroscopic effort has been the 9.2m
Hobby-Eberly Telescope (HET) at McDonald.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 79 1625 The CGRaBS catalog (Candidates Gamma-Ray Blazar)
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See also:
VIII/85 : SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
J/ApJS/171/61 : All-Sky Survey of Flat-Spectrum Radio Sources (Healey+, 2007)
J/ApJ/657/706 : EGRET blazar gamma-ray spectrum (Nandikotkur+, 2007)
J/ApJ/626/95 : Gamma-ray blazar candidates (Sowards-Emmerd+, 2005)
J/A+A/379/755 : Radio data of X- and gamma-ray loud blazars (Venturi+, 2001)
J/AJ/115/1253 : Deep X-Ray Radio Blazar Survey (DXRBS). I. (Perlman+ 1998)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- CGRaBS Object identification (JHHMM+DDMM)
12- 13 I2 h RAh Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 22 F5.2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- Sign of the Declination (J2000)
25- 26 I2 deg DEd Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000)
36- 42 F7.1 mJy S8.4 Flux density at 8.4GHz
44- 48 F5.3 --- FoM Figure of merit
50 A1 --- f_FoM [X] source outside FoM (1)
52 A1 --- l_Rmag Limit flag on Rmag
53- 57 F5.2 mag Rmag ? R band magnitude
59- 62 F4.2 mag AR Extinction in the R band
64- 69 A6 --- Class Object classification (2)
71- 76 F6.3 --- z ? Redshift
77 A1 --- u_z Uncertainty flag on z
79 A1 --- r_z Reference for z (3)
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Note (1): X = source would not satisfy the FoM cutoff if its X-ray flux
were ignored. See Section 2.
Note (2): Classes are:
AGN = Active Galaxy Nucleus
BLL = BL Lac object
FSRQ = flat-spectrum radio quasar
GALAXY = galaxy
NLRG = narrow-line radio galaxy
PN = planetary nebula
See Sections 3.2.1-3.2.2 for discussion of the type classifications.
Note (3): references as follows:
V = Veron quasar catalog, twelfth edition; Veron-Cetty & Veron, 2006,
Cat. VII/248
S = SDDS DR5 quasar catalog; Schneider et al., 2007, Cat. VII/252
N = NED;
I = SIMBAD;
C = CGRaBS spectroscopy.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Jun-2009