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: -------------------------------------------------------------------------------- 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
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