J/ApJ/777/7ivo://CDS.VizieR/J/ApJ/777/7doi:10.26093/cds/vizier.17770007CDSSomers G.Mathur S.Martini P.Watson L.Grier C.J.Ferrarese L.2017-11-06T12:23:14Z2015-04-28T09:22:26ZCDS support team

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

cds-question@unistra.frx-ray-sourcesgalaxiesastronomical-object-identificationWe have used Chandra observations of eight bulgeless disk galaxies to identify new ultraluminous X-ray source (ULX) candidates, study their high-mass X-ray binary (HMXB) population, and search for low-luminosity active galactic nuclei (AGNs). We report the discovery of 16 new ULX candidates in our sample of galaxies. Eight of these are found in the star forming galaxy NGC 337, none of which are expected to be background contaminants. The HMXB luminosity function of NGC 337 implies a star formation rate (SFR) of 6.8_-3.5_^+4.4^M_{sun}/yr, consistent at 1.5{sigma} with a recent state of the art SFR determination. We also report the discovery of a bright ULX candidate (X-1) in ESO 501-23. X-1's spectrum is well fit by an absorbed power law with {Gamma}=1.18_-0.11_^+0.19^ and N_H_=1.13_-1.13_^+7.07^/cm2, implying a 0.3-8keV flux of 1.08_-0.07_^+0.05^x10^-12^erg/s/cm2. Its X-ray luminosity (L_X_) is poorly constrained due to uncertainties in the host galaxy's distance, but we argue that its spectrum implies L_X_>10^40^erg/s. An optical counterpart to this object may be present in an Hubble Space Telescope image. We also identify ULX candidates in IC 1291, PGC 3853, NGC 5964, and NGC 2805. We find no evidence of nuclear activity in the galaxies in our sample, placing a flux upper limit of 4x10^-15^erg/s/cm2 on putative AGN. Additionally, the Type II-P supernova SN 2011DQ in NGC 337, which exploded two months before our X-ray observation, is undetected.2013ApJ...777....7Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/777/7CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)II/311 : WISE All-Sky Data Release (Cutri+ 2012)II/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003)I/284 : The USNO-B1.0 Catalog (Monet+ 2003)VII/155 : Third Reference Cat. of Bright Galaxies (RC3) (de Vaucouleurs+ 1991)VII/145 : Nearby Galaxies Catalogue (NBG) (Tully 1988)J/ApJ/741/49 : ULX candidates in nearby galaxies (Swartz+, 2011)J/ApJ/687/471 : Observational comparison between ULXs and XRBs (Berghea+, 2008)J/ApJ/676/184 : Peculiar motion away from the Local Void (Tully+, 2008)J/ApJ/649/730 : ULX population in nearby galaxies from XMM (Winter+, 2006)J/ApJS/164/81 : Spectrophotometry of nearby galaxies (Moustakas+, 2006)J/AJ/126/1607 : IRAS Revised Bright Galaxy Sample (Sanders+, 2003)http://www.sdss3.org/ : SDSS-III home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/777/7https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/777/7http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/777/7https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/777/7https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/777/7http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/777/7GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/777/7/table5 (SDSS-DR8 cross-correlation)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/777/7/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/777/7/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/777/7/table5?GETtext/xml+votable180.050000true14.96555833-7.514488890.005555555555555556Cone search capability for table J/ApJ/777/7/table1 (Galaxy properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/777/7/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/777/7/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/777/7/table1?GETtext/xml+votable180.050000true14.9587083-7.57797220.005555555555555556Cone search capability for table J/ApJ/777/7/table3 (Full X-ray source list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/777/7/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/777/7/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/777/7/table3?GETtext/xml+votable180.050000true14.965417-7.5144440.005555555555555556Cone search capability for table J/ApJ/777/7/table4 (USNO-B1.0 cross-correlation)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/777/7/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/777/7/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/777/7/table4?GETtext/xml+votable180.050000true14.9654375-7.514486110.005555555555555556Cone search capability for table J/ApJ/777/7/table6 (WISE cross-correlation)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/777/7/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/777/7/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/777/7/table6?GETtext/xml+votable180.050000true14.96549167-7.514466670.0055555555555555566/5967 6001 7584 15068 17592 17594 17598 31469 38872 388748.157980699529898e-21 6.513807192489934e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/777/7?format=asciiX-raydefaultJ/ApJ/777/7/table5SDSS-DR8 cross-correlationCl[3/6] SDSS-DR8 object class (3=galaxy, 6=star)meta.code.classinte_umag[0.005/4] umag uncertaintymagstat.error;phot.mag;em.opt.UfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/173] Sequence number as in table 3meta.recordintObsID[12979/12986] Observation IDmeta.id;obsintChip[6/8] CCD chip numbermeta.id;instrintWNum[1/19] Wavdetect source numbermeta.idintSDSSSDSS-DR8 identification (JHHMMSS.ss+DDMMSS.s)meta.id.crosscharDelta[0.1/2] Offset {Delta} between centroid of Chandra source and SDSS DR8 sourcearcsecinstr.offsetfloatumag[14.5/27.7] SDSS-DR8 u-band magnitudemagphot.mag;em.opt.Ufloatgmag[10.8/31] SDSS-DR8 g-band magnitudemagphot.mag;em.opt.Bfloate_gmag[0.001/0.7] gmag uncertaintymagstat.error;phot.mag;em.opt.Bfloatrmag[9.9/30.2] SDSS-DR8 r-band magnitudemagphot.mag;em.opt.Rfloate_rmag[0.001/0.7] rmag uncertaintymagstat.error;phot.mag;em.opt.Rfloatimag[9.7/24.3] SDSS-DR8 i-band magnitudemagphot.mag;em.opt.Ifloate_imag[0.001/0.9] imag uncertaintymagstat.error;phot.mag;em.opt.Ifloatzmag[9.8/27.7] SDSS-DR8 z-band magnitudemagphot.mag;em.opt.Ifloate_zmag[0.001/2] zmag uncertaintymagstat.error;phot.mag;em.opt.IfloatRAJ2000SDSS-DR8 hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000SDSS-DR8 degree of declination (J2000)pos.eq.dec;meta.mainJ/ApJ/777/7/table1Galaxy propertiesNameGalaxy namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of right ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000) (1)pos.eq.dec;meta.mainePos[0.5/1.3] Positional uncertainty (1)arcsecstat.error;posfloatDist[7/31.5] Distance to the galaxyMpcpos.distance;pos.heliocentricfloatr_DistDistance reference (2)meta.ref;pos.framecharMaj[109/379] Semi-major axis of the 25th magnitude/arcsec^2^ B-band isophote (3)arcsecphys.angSize;em.opt.BintMin[87/287] Semi-minor axis of the 25th magnitude/arcsec^2^ B-band isophote (3)arcsecphys.angSize;srcintPA[105/300] Pitch angle of the galaxy, from Watson et al. (2012ApJ...751..123W)degsrc.morph.paramfloate_PA[0.2/5] PA uncertaintydegstat.errorfloatTT[6.5/8] de Vaucouleurs (VII/155) T typemeta.notefloatNH[0.9/7.4] Galactic hydrogen column density along line-of-sight to galaxy (4)1e+20cm**-2phys.columnDensity;pos.galacticfloatAGN[37.3/38.7] log 2{sigma} upper limit for a putative AGN luminosity at the location from RA and DEClog(1e-07W)phys.luminosityfloatULXNumber of ULX candidates in this galaxymeta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/777/7/table3Full X-ray source listrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsID[12979/12986] Chandra observation ID (1)meta.id;obsintChipACIS-S chip number (S2-S4)meta.id;instrcharSeq[1/174] Running sequence numbermeta.id;meta.mainintprimaryULXSimbad column added by the CDSmeta.codeintnullableCXOUChandra X-ray source name (JHHMMSS.s+DDMMSS)meta.idcharXcCross-correlations with optical/IR sources (tables 4--6)meta.ref.urlintnullableRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainAeff[102/655] 1.7keV effective area at the location of the source (2)cm**2phys.area;instrintDelta[0/13] Angular distance {Delta} from the pointing location of the observation to the sourcearcminpos.angDistancefloatBcts[4/867] Net counts in the 0.3-8keV band (3)ctphot.count;em.X-rayfloate_Bcts[2/30] Ncts 1{sigma} uncertainty (3)ctstat.errorfloatScts[0/529] Net counts in the 0.3-2keV band (3)ctphot.count;em.X-rayfloate_Scts[0/23] Scts 1{sigma} uncertainty (3)ctstat.errorfloatHcts[-3/339] Net counts in the 2-8keV band (3)ctphot.count;em.X-rayfloate_Hcts[0.1/19] Hcts 1{sigma} uncertainty (3)ctstat.errorfloatD25?[Y] Is this object within the D25 isophote of the target galaxy?meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/777/7/table4USNO-B1.0 cross-correlationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/172]? Sequence number as in table 3meta.recordintnullableObsID[12979/12986] Observation IDmeta.id;obsintChip[6/8] CCD chip numbermeta.id;instrintWNumWavdetect source numbermeta.idintUSNO-B1.0USNO-B1.0 identifiermeta.id.crosscharDelta[0.08/2] Offset between X-ray source and USNO-B1.0 source centroidarcsecinstr.offsetfloatB1mag[10.9/21.3]? First USNO-B1 B-band magnitudemagphot.mag;em.opt.BfloatnullableR1mag[9.4/20.3]? First USNO-B1 R-band magnitudemagphot.mag;em.opt.RfloatnullableB2mag[10.3/21.9]? Second USNO-B1 B-band magnitudemagphot.mag;em.opt.BfloatnullableR2mag[9.3/20.8]? Second USNO-B1 R-band magnitudemagphot.mag;em.opt.RfloatnullableImag[8.9/18.8]? USNO-B1 I-band magnitudemagphot.mag;em.opt.IfloatnullableRAJ2000USNO-B1 hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000USNO-B1 degree of declination (J2000)pos.eq.dec;meta.mainpmRA[-142/12] USNO-B1 proper motion along RAmas/yrpos.pm;pos.eq.raintpmDE[-62/12] USNO-B1 proper motion along DECmas/yrpos.pm;pos.eq.decintJ/ApJ/777/7/table6WISE cross-correlationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/173] Sequence number as in table 3meta.recordintObsID[12979/12986] Observation IDmeta.id;obsintChip[6/8] CCD chip numbermeta.id;instrintWNumWavdetect source numbermeta.idintWISEWISE identification (JHHMMSS.ss+DDMMSS.s)meta.id.crosscharDelta[0.09/2] Offset between centroid of Chandra source and WISE sourcearcsecinstr.offsetfloatW1mag[7.5/17.9] WISE W1-band magnitudemagphot.mag;em.IR.3-4umfloate_W1mag[0.02/0.3] W1mag uncertaintymagstat.error;phot.magfloatW2mag[7.6/16.9] WISE W2-band magnitudemagphot.mag;em.IR.4-8umfloate_W2mag[0.02/0.5] W2mag uncertaintymagstat.error;phot.magfloatl_W3magLimit flag on W3magmeta.code.errorcharW3mag[6.7/13.4] WISE W3-band magnitudemagphot.flux.density;em.IR.8-15umfloate_W3mag[0.01/0.6]? W3mag uncertaintymagstat.error;phot.magfloatnullablel_W4magLimit flag on W4magmeta.code.errorcharW4mag[3.7/9.8] WISE W4-band magnitudemagphot.flux.density;em.IR.15-30umfloate_W4mag[0.01/0.6]? W4mag uncertaintymagstat.error;phot.magfloatnullableRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainJ/ApJ/777/7/table7Sources consistent with ULX in the sample galaxiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy namemeta.id;meta.maincharXIDX-ray identifier (X-NN)meta.idcharSeq[5/145] Sequence number as in table 3meta.recordintCXOUChandra ID name (JHHMMSS.s+DDMMSS)meta.idcharDist[2.2/168] Projected distance from galactic nucleusarcsecpos.angDistancefloatBcts[4.4/867] Net broad (0.3-8keV) detected counts within 2.3" aperturectphot.count;em.X-rayfloate_Bcts[2.2/29.5] Bcts uncertaintyctstat.errorfloatScts[1/528.7] Net soft (0.3-2keV) detected counts within 2.3" aperturectphot.count;em.X-rayfloate_Scts[1/23] Scts uncertaintyctstat.errorfloatHcts[-0.3/338.3] Net hard (2-8keV) detected counts within 2.3" aperturectphot.count;em.X-rayfloate_Hcts[0.1/18.4] Hcts uncertaintyctstat.errorfloatHR[-1.09/0.6] Hardness ratio: (H-S)/(H+S) (1)phot.flux;arith.ratiofloate_HR[0.03/0.5] Gaussian error of HR (1)stat.errorfloatGamma[0.1/3.1]? Approximate value of the power law exponent {Gamma} (2)stat.fit.paramfloatnullableE_Gamma? Positive error on Gammastat.error;stat.maxfloatnullablee_Gamma? Negative error on Gammastat.errorfloatnullableFlux[0.43/84.7] Unabsorbed flux in 10^-14^erg/s/cm^2^ (3)1e-17W.m**-2phot.flux;em.X-rayfloate_Flux[0.2/2.9] Flux uncertainty1e-17W.m**-2stat.error;phot.fluxfloatLX[0.4/167] X-ray luminosity of the source (4)1e+31Wphys.luminosity;em.X-rayfloate_LX[0.1/11] LX uncertainty1e+31Wstat.errorfloatHa?[Y] Does this object coincide with H{alpha} emission from MDM imaging?meta.codecharNoteNotes (5)meta.notecharSimbadSimbad column added by the CDSmeta.ref.urlchar