Variable and transient radio sources in FIRST J/ApJ/742/49 ivo://CDS.VizieR/J/ApJ/742/49 doi:10.26093/cds/vizier.17420049 CDS Thyagarajan N. Helfand D.J. White R.L. Becker R.H. 2017-12-05T05:11:06Z 2013-05-16T09:47:08Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr radio-sources radio-continuum-emission surveys A comprehensive search for variable and transient radio sources has been conducted using ~55000 snapshot images of the Faint Images of the Radio Sky at Twenty-cm survey (Cat. VIII/90). We present an analysis leading to the discovery of 1627 variable and transient objects down to mJy levels over a wide range of timescales (a few minutes to years). Variations observed range from 20% to a factor of 25. Multi-wavelength matching for counterparts reveals the diverse classes of objects exhibiting variability, ranging from nearby stars and pulsars to galaxies and distant quasars. Interestingly, more than half of the objects in the sample have either no classified counterparts or no corresponding sources at any other wavelength and require multi-wavelength follow-up observations. We discuss these classes of variables and speculate on the identity of objects that lack multi-wavelength counterparts. 2011ApJ...742...49T https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/742/49 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VIII/90 : The FIRST Survey Catalog, Version 12Feb16 (Becker+ 2012) VII/269 : SDSS Quasar Catalog, DR9Q (Paris+, 2012) V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) VIII/26 : Low-Frequency Variable Radio Sources Monitoring (Mitchell+, 1994) J/ApJ/737/45 : Variable 1.4GHz radio sources from NVSS and FIRST (Ofek+, 2011) J/ApJS/180/67 : Photometric selection of QSOs from SDSS. II. (Richards+, 2009) J/AJ/127/2565 : Faint FIRST variable radio sources (de Vries+, 2004) J/AJ/125/2411 : SIRTF First-Look Survey (Condon+, 2003) J/ApJS/143/1 : FIRST-APM Source Catalog (McMahon+, 2002) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/742/49 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/742/49 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/742/49 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/742/49 https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/742/49 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/742/49 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/ApJ/742/49/table1 (Summary of properties of variables and transients) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/742/49/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/742/49/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/742/49/table1? GET text/xml+votable 180.0 50000 true 103.4665 60.48528611 0.005555555555555556 5/2405 6/4140 4142 4143 4148 4158 4163 4190 4195 4236 4239 4245 4259 4304 4314 4332 4336 4352 4354 4360 4366 4368 4372 4376 4377 4392 4401 4412 4436 4455 4465 4475 4486 4500 4502 4504 4505 4507 4514 4534 4537 4566 4569 4592 4594 4595 4602 4603 4615 4619 4623 4627 4628 4642 4644 4648 4655 4664 4669 4695 4698 4704 4711 4724 4737 4738 4749 4753 4754 4757 4759 4762 4770 4771 4774 4777 4783 4789 4804 4806 4807 4808 4831 4836 4842 4858 4866 4868 4891 4900 4921 4927 4933 4941 4945 4957 4972 4974 4976 4978 4979 4989 4996 5005 5022 5026 5028 5030 5032 5033 5037 5039 5042 5043 5046 5058 5061 5062 5067 5068 5072 5083 5101 5106 5128 5129 5130 5135 5141 5161 5164 5168 5201 5206 5207 5211 5220 5229 5233 5234 5240 5242 5244 5246 5260 5262 5267 5277 5279 5284 5297 5317 5328 5334 5353 5355 5356 5357 5380 5381 5382 5384 5390 5393 5405 5408 5411 5413 5415 5421 5422 5424 5425 5427 5428 5435 5442 5448 5452 5461 5463 5465 5466 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of properties of variables and transients SimbadName Simbad column added by the CDS meta.id char recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int RAJ2000 Hour of Right Ascension (J2000) (1) pos.eq.ra;meta.main DEJ2000 Degree of Declination (J2000) (1) pos.eq.dec;meta.main Fpeak [1/234.93] FIRST 1.4GHz peak flux density mJy phot.flux.density;em.radio.750-1500MHz float Fwmp Weighted mean 1.4GHz peak flux density mJy phot.flux.density;em.radio.750-1500MHz float l_Flow Limit flag on Flow meta.code.error char Flow Lower limit of measured flux density range mJy phot.flux.density;em.radio.750-1500MHz float l_Fup Limit flag on Fup meta.code.error char Fup Upper limit of measured flux density range mJy phot.flux.density;em.radio.750-1500MHz float Fnvss ? NVSS 1.4GHz flux density (if match found) mJy phot.flux.density;em.radio.750-1500MHz double nullable N Number of observations in light curve meta.number int l_sigma Limit flag on sigma meta.code.error char sigma [4/8] Variability indicator {sigma}(P({chi}^2^,{nu})) (2) src.var.index float s.max Maximum deviation {sigma}_max_ from mean (3) stat.stdev float D.max Maximum deviation {Delta}_max_({sigma}) (4) stat.fit.param float l_Ratio Limit flag on Ratio meta.code.error;arith.ratio char Ratio Maximum-to-minimum flux density ratio (5) phot.flux.density;arith.ratio float Tmin ? Minimum significant timescale d time.scale int nullable fN [N-] Neighbour flag (6) meta.code char s.nbr [-6.2/3.6]? Distance of neighbors flux {sigma}_nbr_ (7) stat double nullable Vt [VT] Variable or Transient light curve type src.class char imag ? SDSS i-band magnitude mag phot.mag;em.opt.I double nullable Note Cross-ID with other catalogs and object type meta.note char NVSS Cross-match with the NVSS (Cat. VIII/65) within 7" meta.ref.url int nullable SDSS Cross-match with the SDSS-DR9 (Cat. V/139) within 5" meta.ref.url int nullable FIRST Display the FIRST data (Cat. VIII/90) within 0.5" meta.ref.url char Sloan Display the online SDSS data for the nearest object meta.ref.url char