J/ApJ/739/76ivo://CDS.VizieR/J/ApJ/739/76doi:10.26093/cds/vizier.17390076CDSBower G.C.Whysong D.Blair S.Croft S.Keating G.Law C.,Williams P.K.G.Wright M.C.H.2013-03-18T21:27:36Z2013-02-28T08:59:28ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frradio-continuum-emissionsurveysWe present results from daily radio continuum observations of the Bootes field as part of the Pi GHz Sky Survey (PiGSS). These results are part of a systematic and unbiased campaign to characterize variable and transient sources in the radio sky. The observations include 78 individual epochs distributed over five months at a radio frequency of 3.1GHz with a median rms image noise in each epoch of 2.8mJy. We produce five monthly images with a median rms of 0.6mJy. No transient radio sources are detected in the daily or monthly images. At 15mJy, we set an upper limit (2{sigma}) to the surface density of one-day radio transients at 0.025deg^-2^. At 5mJy, we set an upper limit (2{sigma}) to the surface density of one-month radio transients at 0.18deg^-2^. We also produce light curves for 425 sources and explore the variability properties of these sources. Approximately 20% of the sources exhibit some variability on daily and monthly timescales. The maximum rms fractional modulations on the one-day and one-month timescales for sources brighter than 10mJy are 2 and 0.5, respectively. The probability of a daily fluctuation for all sources and all epochs by a factor of 10 is less than 10^-4^. We compare the radio to mid-infrared variability for sources in the field and find no correlation. Finally, we apply the statistics of transient and variable populations to constrain models for a variety of source classes.2011ApJ...739...76Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/739/76CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/87 : The Allen Telescope Array 20cm Survey (ATATS). I. (Croft+ 2010)J/ApJ/725/1792 : Pi Ghz Sky Survey (PiGSS). I. (Bower+, 2010)J/AJ/123/1784 : 1.4 GHz imaging of the Bootes field (de Vries+, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/739/76https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/739/76http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/739/76https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/739/76https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/739/76http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/739/76GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/739/76/table1 (Source statistics)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/739/76/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/739/76/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/739/76/table1?GETtext/xml+votable180.050000true215.823934.702670.0055555555555555565/2286 2287 2628 2629 6/9139 9142 105602.0540815036043594e-24 2.0540815036043594e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/739/76?format=asciiRadiodefaultJ/ApJ/739/76/table1Source statisticsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPiGSSSource name (JHHMMSS+DDMMSS)meta.id;meta.maincharS[1/287.5] Primary-beam corrected flux density at 3.1GHzmJyphot.flux.density;em.radio.1500-3000MHzfloate_S[0.3/5.5] Uncertainty in SmJystat.errorfloatGain[1/18.12] Primary beam gaininstr.paramfloatchi2d[0.1/2.66] Daily reduced {chi}^2^stat.fit.chi2floatchi2m[0.02/13.31] Monthly reduced {chi}^2^stat.fit.chi2floatsigModd[-1536.23/437.33] Daily RMS fractional modulationsrc.var.indexdoublesigModm[0.01/2.98] Monthly RMS fractional modulationsrc.var.indexfloatminModd[-13/-0.1] Minimum daily fractional modulationsrc.var.indexfloatmaxModd[-0.37/12.57] Maximum daily fractional modulationsrc.var.indexfloatminModmMinimum monthly fractional modulationsrc.var.indexfloatmaxModmMaximum monthly fractional modulationsrc.var.indexfloat_RAPositions from PaperI (J/ApJ/725/1792) (right ascension part)degpos.eq.ra;meta.main_DEPositions from PaperI (J/ApJ/725/1792) (declination part)degpos.eq.dec;meta.main