J/ApJ/763/128ivo://CDS.VizieR/J/ApJ/763/128doi:10.26093/cds/vizier.17630128CDSBinder B.Williams B.F.Eracleous M.Gaetz T.J.Kong A.K.H.,Skillman E.D.Weisz D.R.2017-07-12T15:35:06Z2014-11-05T09:11:53ZCDS support team

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

cds-question@unistra.frgalaxiesx-ray-sourceshst-photometrysurveysx-ray-binary-starsWe present a comprehensive X-ray point-source catalog of NGC 404 obtained as part of the Chandra Local Volume Survey. A new 97ks Chandra ACIS-S observation of NGC 404 was combined with archival observations for a total exposure of ~123ks. Our survey yields 74 highly significant X-ray point sources and is sensitive to a limiting unabsorbed luminosity of ~6x10^35^erg/s in the 0.35-8keV band. To constrain the nature of each X-ray source, cross-correlations with multi-wavelength data were generated. We searched overlapping Hubble Space Telescope observations for optical counterparts to our X-ray detections, but find only two X-ray sources with candidate optical counterparts. We find 21 likely low-mass X-ray binaries (LMXBs), although this number is a lower limit due to the difficulties in separating LMXBs from background active galactic nuclei. The X-ray luminosity functions (XLFs) in both the soft and hard energy bands are presented. The XLFs in the soft band (0.5-2keV) and the hard band (2-8keV) have a limiting luminosity at the 90% completeness limit of 10^35^erg/s and 10^36^erg/s, respectively, significantly lower than previous X-ray studies of NGC 404. We find the XLFs to be consistent with those of other X-ray populations dominated by LMXBs. However, the number of luminous (>10^37^erg/s) X-ray sources per unit stellar mass in NGC 404 is lower than is observed for other galaxies. The relative lack of luminous XRBs may be due to a population of LMXBs with main-sequence companions formed during an epoch of elevated star formation ~0.5Gyr ago.2013ApJ...763..128Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/763/128CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)B/hst : HST Archived Exposures Catalog (STScI, 2007)IX/45 : The Chandra Source Catalog, Release 1.1 (Evans+ 2012)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/284 : The USNO-B1.0 Catalog (Monet+ 2003)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)J/ApJ/758/15 : Chandra X-ray point sources of NGC 300 (Binder+, 2012)J/ApJ/737/45 : Variable 1.4GHz radio sources from NVSS & FIRST (Ofek+, 2011)J/ApJ/734/L22 : ACS Nearby Galaxy Survey Treasury (Williams+, 2011)J/ApJS/192/10 : Chandra ACIS survey in 383 nearby galaxies. I. (Liu, 2011)J/ApJS/192/6 : A GALEX UV imaging survey of nearby galaxies (Lee+, 2011)J/ApJS/181/444 : X-emitting stars identified from RASS/SDSS (Agueros+, 2009)J/ApJS/179/19 : CDFS survey: 2 Ms source catalogs (Luo+, 2008)J/MNRAS/382/1552 : Multiwavelength study of nearby galaxy nuclei (Lira+, 2007)J/ApJS/157/59 : Ultraluminous X-ray sources in nearby galaxies (Liu+, 2005)J/MNRAS/328/461 : Early-type galaxies X-ray luminosities (O'Sullivan+, 2001)J/AJ/116/1626 : Spiral & lenticular galaxy brightness profiles (Baggett+,https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/763/128https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/763/128http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/763/128https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/763/128https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/763/128http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/763/128GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/763/128/Xsources (log(pns) values, total net counts, fluxes, hardness ratios and classifications of the NGC 404 source list (tables 3--6, 10 and 13))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/763/128/Xsources?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/763/128/Xsources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/763/128/Xsources?GETtext/xml+votable180.050000true17.1593961135.674263890.0055555555555555566/22829.276497240453405e-25 1.4134638842407062e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/763/128?format=asciiX-raydefaultJ/ApJ/763/128/table12Multi-wavelength observations of NGC 404 X-ray sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/74] Running sequence numbermeta.id;meta.mainintNUV[15.1/24.5]? GALEX GR6 NUV magnitudemagphot.mag;em.UVfloatnullablee_NUV[0.001/0.6]? NUV uncertaintymagstat.errorfloatnullableFUV[17/24.1]? GALEX GR6 FUV magnitudemagphot.mag;em.UVfloatnullablee_FUV[0.003/0.4]? FUV uncertaintymagstat.errorfloatnullableF606W[21.6/25.4]? HST F606W band magnitudemagphot.mag;em.opt.Rfloatnullablee_F606W[0.01/0.02]? F606W uncertaintymagstat.errorfloatnullableF814W[19.2/24.3]? HST F814W band magnitudemagphot.mag;em.opt.Ifloatnullablee_F814W[0.01]? F814W uncertaintymagstat.errorfloatnullableBmag[9/21]? USNO-B1 B-band magnitudemagphot.mag;em.opt.BfloatnullableRmag[8/21]? USNO-B1 R-band magnitudemagphot.mag;em.opt.RfloatnullableJmag[7.6/16.4]? 2MASS J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.02/0.2]? Jmag uncertaintymagstat.error;phot.mag;em.IR.JfloatnullableHmag[7.5/15.9]? 2MASS H-band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.02/0.2]? Hmag uncertaintymagstat.error;phot.mag;em.IR.HfloatnullableKsmag[7.4/15.5]? 2MASS Ks-band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0.02/0.3]? Ksmag uncertaintymagstat.error;phot.mag;em.IR.KfloatnullableS1.4[3.4/53.7]? NVSS 1.4GHz flux densitymJyphot.flux.density;em.radio.750-1500MHzfloatnullablee_S1.4[0.4/2]? S1.4 uncertaintymJystat.errorfloatnullableJ/ApJ/763/128/Xsourceslog(pns) values, total net counts, fluxes, hardness ratios and classifications of the NGC 404 source list (tables 3--6, 10 and 13)l_Net3Limit flag on Net3meta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/74] Running sequence numbermeta.id;meta.mainintprimaryIDSource identifier (HHMMSS.ss+DDMMSS.s; J2000)meta.idcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainePos[0.02/1.1] Positional error circle around sourcearcsecstat.error;posfloatExpmapTotal exposure map value in source regionMs.cm**2phys.area;instrfloatRsrc[1.5/36.3] Average radius of extraction region (1)pixphys.angSize;obs.field;stat.meanfloattheta[0/14] Off-axis angle {theta}arcmininstr.offsetfloatl_logP0Limit flag on logP0meta.code.errorcharlogP0[-10/0] Non-source probability, 0.5-8keV (2)stat.fit.goodnessfloatl_logP2Limit flag on logP2meta.code.errorcharlogP2[-10/0] Non-source probability, 0.5-2keV (2)stat.fit.goodnessfloatl_logP3Limit flag on logP3meta.code.errorcharlogP3[-10/0] Non-source probability, 2-8keV (2)stat.fit.goodnessfloatl_logP4Limit flag on logP4meta.code.errorcharlogP4[-10/0] Non-source probability, 0.35-8keV (2)stat.fit.goodnessfloatl_logP5Limit flag on logP5meta.code.errorcharlogP5[-10/0] Non-source probability, 0.35-1.1keV (2)stat.fit.goodnessfloatl_logP6Limit flag on logP6meta.code.errorcharlogP6[-10/0] Non-source probability, 1.1-2.6keV (2)stat.fit.goodnessfloatNet0[2.5/697] Net counts in the 0.5-8keV energy bandctphot.count;em.X-rayfloatE_Net0Upper limit uncertainty in Net0ctstat.error;stat.maxfloate_Net0Lower limit uncertainty in Net0ctstat.errorfloatNet2[0.8/687] Net counts in the 0.5-2keV energy bandctphot.count;em.X-rayfloatE_Net2Upper limit uncertainty in Net2ctstat.error;stat.maxfloate_Net2Lower limit uncertainty in Net2ctstat.errorfloatNet3[-12/205.5] Net counts in the 2-8keV energy bandctphot.count;em.X-rayfloatE_Net3? Upper limit uncertainty in Net3ctstat.error;stat.maxfloatnullablee_Net3? Lower limit uncertainty in Net3ctstat.errorfloatnullableNet4[4.5/713] Net counts in the 0.35-8keV energy bandctphot.count;em.X-rayfloatE_Net4Upper limit uncertainty in Net4ctstat.error;stat.maxfloate_Net4Lower limit uncertainty in Net4ctstat.errorfloatl_Net5Limit flag on Net5meta.code.errorcharNet5[-0.3/555] Net counts in the 0.35-1.1keV energy bandctphot.count;em.X-rayfloatE_Net5? Upper limit uncertainty in Net5ctstat.error;stat.maxfloatnullablee_Net5? Lower limit uncertainty in Net5ctstat.errorfloatnullablel_Net6Limit flag on Net6meta.code.errorcharNet6[0.9/342] Net counts in the 1.1-2.6keV energy bandctphot.count;em.X-rayfloatE_Net6? Upper limit uncertainty in Net6ctstat.error;stat.maxfloatnullablee_Net6? Lower limit uncertainty in Net6ctstat.errorfloatnullablelogF0[-7/-4] Log of 0.5-8keV energy band photon flux (4)log(cm**-2.s**-1)phot.flux;em.X-rayfloatlogF2Log of 0.5-2keV energy band photon flux (4)log(cm**-2.s**-1)phot.flux;em.X-rayfloatlogF3Log of 2-8keV energy band photon flux (4)log(cm**-2.s**-1)phot.flux;em.X-rayfloatlogF4Log of 0.35-8keV energy band photon flux (4)log(cm**-2.s**-1)phot.flux;em.X-rayfloatlogF5Log of 0.35-1.1keV energy band photon flux (4)log(cm**-2.s**-1)phot.flux;em.X-rayfloatlogF6Log of 1.1-2.6keV energy band photon flux (4)log(cm**-2.s**-1)phot.flux;em.X-rayfloatHR1[-0.8/0.7] The "soft" color (5)phot.flux;arith.ratiofloate_HR1Uncertainty in HR1stat.errorfloatHR2[-0.7/0.8] The "hard" color (5)phot.flux;arith.ratiofloate_HR2Uncertainty in HR2stat.errorfloatHclClassification from hardness ratios (HRs) (G2)src.classcharFitSpectral fit ("apec" = Astrophysical Plasma Emission Code, Smith et al. 2001ApJ...556L..91S)meta.noteVarVariability (long or rapid)meta.code;src.varchard[0/6.3] Galactocentric distancekpcpos.distance;pos.galactocentricfloatXIDWavelength counterpart(s)meta.notecharClassObject classification (background AGN, XRB, SSS:super-soft source or FS: forground star)meta.code.class;instr.backgroundchar