J/AJ/152/82ivo://CDS.VizieR/J/AJ/152/82doi:10.26093/cds/vizier.51520082CDSTingay S.J.Hancock P.J.Wayth R.B.Intema H.Jagannathan P.Mooley K.2019-03-29T12:28:25Z2016-11-29T14:47:52ZCDS support team

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

cds-question@unistra.frradio-continuum-emissionradio-sourcesWe present the first dedicated radio continuum survey of a Kepler K2 mission field, Field 1, covering the North Galactic Cap. The survey is wide field, contemporaneous, multi-epoch, and multi-resolution in nature and was conducted at low radio frequencies between 140 and 200MHz. The multi-epoch and ultra wide field (but relatively low resolution) part of the survey was provided by 15 nights of observation using the Murchison Widefield Array (MWA) over a period of approximately a month, contemporaneous with K2 observations of the field. The multi-resolution aspect of the survey was provided by the low resolution (4') MWA imaging, complemented by non-contemporaneous but much higher resolution (20'') observations using the Giant Metrewave Radio Telescope (GMRT). The survey is, therefore, sensitive to the details of radio structures across a wide range of angular scales. Consistent with other recent low radio frequency surveys, no significant radio transients or variables were detected in the survey. The resulting source catalogs consist of 1085 and 1468 detections in the two MWA observation bands (centered at 154 and 185MHz, respectively) and 7445 detections in the GMRT observation band (centered at 148MHz), over 314 square degrees. The survey is presented as a significant resource for multi-wavelength investigations of the more than 21000 target objects in the K2 field. We briefly examine our survey data against K2 target lists for dwarf star types (stellar types M and L) that have been known to produce radio flares.2016AJ....152...82Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/152/82CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVIII/97 : 74MHz VLA Low-frequency Sky Survey Redux (VLSSr) (Lane+, 2014)VIII/42 : Texas Survey of radio sources at 365MHz (Douglas+ 1996)VIII/35 : Radio Sources observed with Culgoora Circular Array (Slee 1995)VIII/16 : Molonglo Reference Catalogue of Radio Sources (Large+ 1991)J/ApJ/734/L34 : 145MHz source measurements by PAPER (Jacobs+, 2011)J/ApJ/648/629 : Radio observations of late M, L, and T dwarfs (Berger+, 2006)J/ApJS/13/65 : Radio source flux densities at 750&1400MHz (Pauliny-Toth+ 1966)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/152/82https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/152/82http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/152/82https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/152/82https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/152/82http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/152/82GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/152/82/table1 (Murchison Widefield Array (MWA) observation log)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/152/82/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/152/82/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/152/82/table1?GETtext/xml+votable180.050000true198.87-40.090.005555555555555556Cone search capability for table J/AJ/152/82/table2 (Catalog from the Murchison Widefield Array (MWA) at 154MHz and 184MHz)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/152/82/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/152/82/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/152/82/table2?GETtext/xml+votable180.050000true170.3635-8.26280.005555555555555556Cone search capability for table J/AJ/152/82/table3 (*Catalog from the TGSS image)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/152/82/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/152/82/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/152/82/table3?GETtext/xml+votable180.050000true171.9716-8.5370.0055555555555555563/421 423 4/1598 1599 1681 1682 1683 1689 1728 1730 1736 1738 5/6381 6382 6383 6570 6721 6722 6723 6753 6755 6764 6765 6767 6865 6868 6869 6918 6924 6926 6948 6950 6956 6/25503 25515 25517 25518 25519 25521 25522 25523 25546 25547 25550 25551 26274 26284 26286 26287 26881 26883 27009 27011 27045 27065 27413 27456 27457 27459 27664 27666 27700 27702 27708 27710 27796 27798 27804 27806 27828 27832 28160 28161 28162 28164 40719 40790 43614 43636 43778 43784https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/152/82?format=asciiRadiodefaultJ/AJ/152/82/table1Murchison Widefield Array (MWA) observation logrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMWA[1087724024/1090489536] Murchison Widefield Array (MWA) observation identifiermeta.id;obs.param;obslongObsUT date of the observationstime.epoch;obsnullableExp[112/296] Exposure time (112 or 296)stime.duration;obs.exposureintTargetObservation target (K2, CenA, or HydA) (1)obs.param;obscharFreq[154.8/185.6] Center frequency (154.88 or 185.60)MHzem.freqfloatRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainJ/AJ/152/82/table2Catalog from the Murchison Widefield Array (MWA) at 154MHz and 184MHzrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreq[154/185] Frequency of the observation (154 or 185)MHzem.freq;obsintSource[0/2012] Source identifier (used in place of a position based name) (G1)meta.id;meta.mainintNcNumber of cross-matches for this sourcemeta.numberintnullableRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.maine_RAJ2000Mean error in RAdegdegstat.error;pos.eq.rafloatDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maine_DEJ2000Mean error in DEdegdegstat.error;pos.eq.decfloatSavg[155/20006] Mean flux density across all epochsmJyphot.flux.density;em.radiointe_Savg[1/716] Standard deviation of flux ({Delta}Flux)mJystat.errorintNobs1Number of observations (figure3) for this source and at this frequencymeta.numberintnullableNobs2Number of observations (figure3) for this source at both frequenciesmeta.numberintnullableLCLight Curvemeta.ref.urlcharJ/AJ/152/82/table3*Catalog from the TGSS imagePA[-90/90] Position angledegpos.posAngintDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSource[1/7445] Source running sequence identifier (used in place of a position based name) (2)meta.id;meta.mainintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.maine_RAJ2000Mean error in right ascensiondegstat.error;pos.eq.rafloate_DEJ2000Mean error in declinationdegstat.error;pos.eq.decfloatSp[0.01/16] Peak flux densityJy/beamphot.flux.densityfloate_Sp[0.001/0.074] Mean error on SpJy/beamstat.error;src.spTypefloata[16.95/237] Major axisarcsecphys.angSizefloate_a[0.01/75.8] Mean error in aarcsecstat.errorfloatb[16.75/105.4] Minor axisarcsecphys.angSize;srcfloate_b[0.01/27.2] Mean error in barcsecstat.errorfloate_PA[0/90]? Mean error on PA (a null error indicates that the position angle was not able to be estimated) (1)degstat.errorintnullableJ/AJ/152/82/figure3The light curves of all sources from the 154 and 185MHz catalogsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqFrequency of the observation (154 or 185)MHzem.freq;obsintSource[0/2012] Source identifier (G1)meta.id;meta.mainintJDJulian Date of the observationdtime.epochdoubleS[151/20556] Flux densitymJy/beamphot.flux.density;em.radiointe_S[37/604] Mean error in fluxmJy/beamstat.errorintSpot[45/80] Murchison Widefield Array (MWA) sweet spot number (telescope pointing direction: 45, 56, or 80)meta.idintNobs1Number of observations for this source and at this frequencymeta.numberintnullableNobs2Number of observations for this source at both frequenciesmeta.numberintnullable