J/AJ/127/2565 Faint FIRST variable radio sources (de Vries+, 2004)
Optical properties of faint FIRST variable radio sources.
de Vries W.H., Becker R.H., White R.L., Helfand D.J.
<Astron. J., 127, 2565-2578 (2004)>
=2004AJ....127.2565D 2004AJ....127.2565D
ADC_Keywords: QSOs ; Galaxies, radio ; Radio sources
Keywords: galaxies: active - galaxies: statistics - quasars: general
Abstract:
A sample of 123 radio sources that exhibit significant variations at
1.4GHz on a 7 year baseline has been created using FIRST VLA
B-configuration data from 1995 and 2002 on a strip at δ=0 near
the south Galactic cap. This sample spans the range of radio flux
densities from ∼2 to 1000mJy. It presents both in size and radio flux
density range a unique starting point for variability studies of
galaxies and quasars harboring lower luminosity active galactic nuclei
(AGNs).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 86 128 FIRST Zero-Declination Variable Sample
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See also:
VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Source/component name (JHHMMSS+DDMMSS)
16 A1 --- f_Name [fgh] Flag on Name (1)
18- 19 I2 h RAh Hour of right ascension (J2000)
21- 22 I2 min RAm Minute of right ascension (J2000)
24- 28 F5.2 s RAs Second of right ascension (J2000)
30 A1 --- DE- Sign of the declination (J2000)
31- 32 I2 deg DEd Degree of declination (J2000)
34- 35 I2 arcmin DEm Arcminute of declination (J2000)
37- 40 F4.1 arcsec DEs Arcsecond of declination (J2000)
42- 48 F7.2 mJy F2002 1.4GHz flux density in 2002
50- 56 F7.2 mJy F1995 1.4GHz flux density in 1995
58- 61 F4.2 --- FR Corrected flux density ratio (2)
63- 66 F4.1 --- Sig Significance in units of σ rms (3)
68- 72 F5.3 --- z ? SDSS redshift
74 A1 --- f_z [e] when redshift taken from literature
76- 80 F5.2 mag rmag ? SDSS r-band magnitude
82 A1 --- Id [GQq] Optical identification (5)
84- 85 A2 --- RType Radio morphology (6)
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Note (1): Flasg on Name have the following meaning:
f = Also meets the FZDB-NVSS variability criterion. Only sources
brighter in the FZDB epoch were considered.
g = NGC 7603.
h = Variability of this source is spurious (see section 4).
Note (2): FR=1.0116*[(F2002)+0.090mJy]/F1995
Note (3): As defined by Sig=|(FR-1)/χ(FR+1)|, using
χ=[0.012+(1.3/(S/N))2]1/2 (definition from eq. (4)).
Note (5): Except where noted. Sources in the list with RA between
21 hours and 23 hours are not covered by SDSS DR1.
G = galaxy
Q = quasar
q = quasar, optical data from literature
Note (6): Radio morphology as follows:
PS = Point source
CJ = Core-jet
CL = Core + lobes
CX = Complex
CH = Core + halo
HS = Possible hot spot
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Jul-2004