J/ApJS/262/51ivo://CDS.VizieR/J/ApJS/262/51doi:10.26093/cds/vizier.22620051CDSMaselli A.Forman W.R.Jones C.Kraft R.P.Perri M.2023-01-18T05:59:00Z2022-12-19T09:52:18ZCDS support team

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

cds-question@unistra.frradio-galaxiesquasarsx-ray-sourcesastronomical-object-identificationinfrared-photometryvisible-astronomyWe present Neil Gehrels Swift Observatory (hereafter Swift) observations of 31 sources from the SMS4 catalog, a sample of 137 bright radio sources originally designed to extend the well-studied 3CRR radio sample to the Southern Hemisphere. All these sources had no Chandra or XMM-Newton observations: 24 of these were observed with Swift through a dedicated proposal in 2015, and data for the remaining seven were retrieved from the Swift archive. The reduction and analysis of data collected by the Swift X-ray Telescope (XRT) led to 20 detections in the 0.3-10 keV band. We provide details of the X-ray emission in this band for these 20 detections, as well as upper limits for the remaining 11 SMS4 sources. When statistics allowed, we investigated the extent of the X-ray emission and the hardness ratio, and we carried out a spectral analysis. We matched the 20 X-ray-detected sources with infrared (AllWISE, CatWISE2020) and optical (GSC 2.3.2, DES DR2) catalogs to establish associations with infrared and optical sources and compared our results with previously published counterparts in these bands. Requiring a detection in both the infrared and optical bands to establish a candidate counterpart for our X-ray detections, we obtain reliable counterparts for 18 sources, while the remaining two sources need further investigation to establish firm identifications. In the infrared, we confirm 12 previously established counterparts and provide six new candidates. In the optical, we find agreement with 13 previously established counterparts, while we provide an alternative candidate for five SMS4 sources. We find that ~35% of all the SMS4 sources lie below the lower limit of 10.9Jy for the flux density at 178MHz established for the 3CRR sample, at variance with the values extrapolated using measurements at higher frequencies. Therefore, for future studies where flux-density-limited samples are needed, we encourage the use of the more recent G4Jy sample. We present the list of 56 SMS4 sources that in 2022 March remain to be observed in the X-rays with narrow-field instruments, to highlight interesting sources and organize further observational campaigns to achieve complete X-ray coverage for the whole SMS4 in the forthcoming years.2022ApJS..262...51Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/262/51CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/swift : Swift Master Catalog (HEASARC, 2004-)VIII/1 : The 3C and 3CR Catalogues (Edge+ 1959-1962)VIII/2 : Molonglo Reference Catalog of Radio Sources (Large+ 1981)VIII/16 : Molonglo Reference Catalogue of Radio Sources (Large+ 1991)VIII/35 : Radio Sources observed with Culgoora Circular Array (Slee 1995)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VIII/78 : Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2006)VIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008)II/328 : AllWISE Data Release (Cutri+ 2013)VIII/100 : GaLactic and Extragalactic All-sky MWA survey (Hurley-Walker+, 2016)VIII/105 : The GLEAM 4-Jy (G4Jy) Sample (White+, 2020)I/353 : The Guide Star Catalog, Version 2.4.2 (GSC2.4.2) (STScI, 2020)II/371 : The Dark Energy Survey (DES): Data Release 2 (Abbott+, 2021)II/365 : CatWISE2020 catalog (updated version 28-Jan-2021) (Marocco+, 2021)J/MNRAS/204/151 : Bright radio sources at 178 MHz (3CRR) (Laing+ 1983)J/ApJS/80/137 : Southern Extragalactic Radio Sources (Jones+, 1992)J/AJ/131/100 : The Molonglo Southern 4Jy sample. I (Burgess+, 2006)J/AJ/131/114 : The Molonglo Southern 4Jy sample. II (Burgess+, 2006)J/MNRAS/371/898 : Extragalactic radio sources selected at 20GHz (Sadler+, 2006)J/A+A/495/691 : Multifreq. catalog of blazars, Roma-BZCAT (Massaro+, 2009)J/ApJS/186/378 : Hard X-ray survey from Swift-BAT 2004-2006 (Tueller+, 2010)J/ApJ/734/L34 : 145MHz source measurements by PAPER (Jacobs+, 2011)J/ApJ/751/52 : AGN cand. from the WISE, 2MASS, RASS (W2R) (Edelson+, 2012)J/ApJS/206/17 : New gamma-ray blazar candidates in the 3PBC (Maselli+, 2013)J/ApJS/221/12 : AGNs in the MIR using AllWISE data (Secrest+, 2015)J/A+A/594/A116 : HI4PI spectra and column density maps (HI4PI team+, 2016)J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (Intema+, 2017)J/A+A/624/A145 : Astrometric Catalogue 5, LQAC-5 (Souchay+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/262/51https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/262/51http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/262/51https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/262/51https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/262/51http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/262/51GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/262/51/table1 (*List of correspondences established between the 31 SMS4 sources in our and the GLEAM 4Jy (G4Jy) or TGSS-ADR1 sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/262/51/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/262/51/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/262/51/table1?GETtext/xml+votable180.050000true2.6272917-44.38250.005555555555555556Cone search capability for table J/ApJS/262/51/detect (Swift-XRT detections of SMS4 sources of our (Table 2) and candidate counterparts (Table 7))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/262/51/detect?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/262/51/detect?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/262/51/detect?GETtext/xml+votable180.050000true2.626-44.38205560.005555555555555556Cone search capability for table J/ApJS/262/51/table8 (SMS4 sources with no data (2021 September) from narrow-field X-ray telescopes on board Swift, Chandra, or XMM-Newton)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/262/51/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/262/51/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/262/51/table8?GETtext/xml+votable180.050000true1.5608333-83.10.0055555555555555566/24710 24722 32898 32948 33006 33180 33186 33229 33337 33348 33364 33504 33681 33717 33954 34062 34090 34124 34140 34303 34441 34545 34575 34648 34650 34825 35398 35427 35465 35528 35666 36901 37064 37117 37177 37474 37531 38169 38364 38483 38705 39012 39617 40981 40985 41042 41964 42003 42048 42648 43278 43285 43449 43461 43471 43566 43627 44068 45109 45401 45565 45738 45805 45862 45908 46152 46257 46273 46276 46437 46444 46562 46595 46654 46848 46860 47110 47512 47533 47620 47801 47810 47849 48161 48228 482565.3455714667354156e-20 6.513807192489934e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/262/51?format=asciiX-rayOpticalInfraredRadiodefaultJ/ApJS/262/51/table1*List of correspondences established between the 31 SMS4 sources in our and the GLEAM 4Jy (G4Jy) or TGSS-ADR1 sourcesSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCatG4Jy sample or TGSS-ADR1meta.id;meta.datasetcharSMS4SMS4 name according to the MRC or PKS (for B2148-555 only) designation (BHHMM+DDd)meta.id;meta.maincharprimaryn_SMS4Note on SMS4 (1)meta.notecharDetd=Swift detection (in Table 2) or n=not detected by Swift (in Table 3)meta.ref.urlcharS178[11/59] Extrapolated flux density S_178_Jyphot.flux.density;em.radio.100-200MHzfloatLAS[10/780] the largest angular size of the radio source at 843MHzarcsecphys.angSize;em.radio.750-1500MHz;stat.maxintl_zLower limit flag on zmeta.code.error;src.redshiftcharz[0.038/1.52] Redshiftsrc.redshiftdoublen_zp=photometricmeta.notecharNameIAU name in G4Jy according to the GLEAM designation or in TGSS-ADR1 (JHHMMSS+DDMMSS)meta.id.crosscharG4Jy[20/1732]? G4Jy identifiermeta.id.crossintnullableRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainFlux[6.2/50.04] Actual flux density (2)Jyphot.flux.density;em.radiofloate_Flux[0.01/1.32] Flux uncertaintyJystat.error;phot.fluxfloatNEDNED column added by the CDSmeta.ref.urlcharLEDAmeta.ref.urlcharMorphRadio source morphology (3)src.morphcharMRCDisplay data from the Molonglo Southern 4Jy cat (Burgess+, 2006, J/AJ/131/100 and J/AJ/131/114) within 10"meta.ref.urlintnullableTGSSDisplay data from the GMRT 150MHz cat. (Intema+, 2017, J/A+A/598/A78) within 10"meta.ref.urlintnullableJ/ApJS/262/51/detectSwift-XRT detections of SMS4 sources of our (Table 2) and candidate counterparts (Table 7)W1-W2[0.25/1.52] W1-W2 color indexmagphot.color;em.IR;em.IRfloatSMS4Name of the corresponding SMS4 source according to MRC designation (BHHMM+DDd)meta.id;meta.maincharf_SMS4Flag on SMS4 (1)meta.codecharIRCatInfrared catalog identification (3)meta.id;meta.tablecharIRIdInfrared source identification (JHHMMSS.ss+DDMMSS.s)meta.id.crosscharf_IRIdFlag on IRId (1)meta.codecharW1mag[11.55/17.09] WISE W1 (3.4um) band magnitudemagphot.mag;em.IR.3-4umfloatOIDOptical source identificationmeta.id.crosschardelta[0.11/1.55] the angular separation {Delta} between the given infrared and optical sourcesarcsecpos.angDistancefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000X-ray detection hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000X-ray detection degree of declination (J2000)pos.eq.dec;meta.mainePos[3.6/6.5] Positional error radius at the 90% confidence levelarcsecstat.error;phys.angSizefloatCRte[1.3/190.1] 0.3-10keV count rate in 10^-3^counts/s0.001count.s**-1phot.count;em.X-rayfloate_CRte[0.6/8.8] CRte uncertainty0.001count.s**-1stat.errorfloatl_PLimit flag on Pmeta.code.errorcharPProbability, P, that the signal is a statistical fluctuation of the backgroundstat.fit.goodnessdoubleDate1First date of Swift observation (UT)time.epoch;obsnullableDate2Latest date of Swift observation (UT)time.epoch;obsnullableNobs[1/15] Number of Swift observationsmeta.numberintExp[1221/9203] Exposure timestime.duration;obs.exposureintClObject class (A=unique candidate counterpart) (2)meta.codecharn_SMS4b=sources in our initial Swift proposalmeta.notecharJ/ApJS/262/51/table3XRT count rate 3{sigma} upper limits at the position of the 11 SMS4 sources of our sample not detected by SwiftDate1First date of Swift observation (UT)time.epoch;obsnullableSMS4SMS4 name (BHHMM+DDd)meta.id;meta.maincharP[0.0054/1] Probability, P, that the signal is a statistical fluctuation of the backgroundstat.fit.goodnessdoubleLim[2.1/14.9] 0.3-10keV count rate upper limit at the position of the radio coordinatesphot.count;em.X-ray;stat.maxfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCatMRC or PKS designationmeta.id;meta.datasetcharn_SMS4b=sources in our initial Swift proposalmeta.notecharDate2Latest date of Swift observation (UT)time.epoch;obsnullableNobs[1/13] Number of Swift observationsmeta.numberintExp[1075/6453] Total XRT exposure timestime.duration;obs.exposureintJ/ApJS/262/51/table8SMS4 sources with no data (2021 September) from narrow-field X-ray telescopes on board Swift, Chandra, or XMM-NewtonSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCatMRC or PKS designationmeta.id;meta.datasetcharSMS4SMS4 name (BHHMM+DDd)meta.id;meta.maincharn_SMS4b=accepted in 2021 October for observation with Swiftmeta.notecharRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainl_zLower limit flag on zmeta.code.error;src.redshiftcharz[0.03/1.92]? Redshiftsrc.redshiftdoublenullableNEDNED column added by the CDSmeta.ref.urlcharLEDAmeta.ref.urlcharn_zP=photometricmeta.notecharS178[11/44] Extrapolated flux density S_178_ from SMS4Jyphot.flux.density;em.radio.100-200MHzfloatS181[5.5/34.6] Total integrated flux density S_181_ from G4JyJyphot.flux.density;em.radio.100-200MHzfloatLAS[10/1536] Largest angular size of the radio source at 843MHzarcsecphys.angSize;em.radio.750-1500MHz;stat.maxintRClStructural classification of the radio source (1)meta.code.classcharOClClassification of the associated optical counterpart (2)meta.code.classcharMRCDisplay data from the Molonglo Southern 4Jy cat (Burgess+, 2006, J/AJ/131/100 and J/AJ/131/114) within 10"meta.ref.urlintnullable