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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 86 128 FIRST Zero-Declination Variable Sample
See also: VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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)
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
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Jul-2004
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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