J/A+A/641/A62ivo://CDS.VizieR/J/A+A/641/A62doi:10.26093/cds/vizier.36410062CDSPaggi A.Bonato M.Raiteri C.M.Villata M.De Zotti G.Carnerero M.I.2021-04-27T11:34:32Z2020-09-10T07:29:06ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleix-ray-sourcesBlazars are the rarest and most powerful active galactic nuclei, playing a crucial and growing role in today multi-frequency and multi-messenger astrophysics. They dominate the high-energy extragalactic sky and recently have been associated to high-energy astrophysical neutrinos, and they may be among the accelerators of the ultra-high energy cosmic rays. Current blazar catalogs, however, are incomplete and particularly depleted at low Galactic latitudes. We aim at augmenting the current blazar census starting from a sample of ALMA calibrators that provides more homogeneous sky coverage, especially at low Galactic latitudes, to build a catalog of blazar candidates that can provide candidate counterparts to unassociated gamma-ray sources and to sources of high-energy neutrino emission or ultra-high energy cosmic rays. Starting from the ALMA Calibrator Catalog we built a catalog of 1580 blazar candidates (ALMA Blazar Candidates) for which we collect multi-wavelength information, including Gaia photometric, parallax and proper motion data, SDSS and LAMOST photometric and spectral data, WISE photometric data, X-ray (Swift-XRT, Chandra-ACIS and XMM-Newton-EPIC) count-rates and spectra, and Fermi-LAT fluxes and spectral slopes. We also compared our ALMA Blazar Candidates with existing blazar catalogs, like 4FGL, 3HSP, WIBRaLS2 and the KDEBLLACS. The ALMA Blazar Candidates catalogue fills the lack of low Galactic latitude sources in current blazar catalogues. Cross-matching this catalog with Gaia DR2, SDSS DR12, LAMOST DR5, AllWISE and 4FGL catalogues we obtained 805, 295, 31, 1311 and 259 matches, respectively. ALMA Blazar Candidates are significantly dimmer than known blazars in Gaia g band, while the difference in the Gaia b-r colour between the two populations is less pronounced. Also, ALMA Blazar Candidates sources appear bluer in SDSS than known blazars, although with low statistical significance. Most ALMA Blazar Candidates classified as QSO and BL Lac fall into the SDSS colour regions of low redshift quasars, with some QSOs entering the regions of higher redshift quasars. We collected 110 optical spectra in SDSS DR12 and LAMOST DR5, which mostly classify the corresponding sources as QSO (98), while 12 sources resulted galactic objects. Regarding WISE colours, we found that ABC sources are significantly bluer than known blazars in the w2-w3 and w3-w4 colours. In X-rays we detected 173 ALMA Blazar Candidates, and we were able to extract a X-ray spectra for 92 of them. Our sources are on average similar in X-rays to known blazar in terms of count-rates and spectral slopes, implying that our sample is covering the same region of the blazar parameter space in this band. A comparison of gamma-ray properties shown that ALMA Blazar Candidates are on average dimmer, and their gamma-ray spectra are softer than known blazars, indicating a significant contribution of FSRQ sources. Making use of WISE colours, we classified 715 ALMA Blazar Candidates as candidate gamma-ray blazar of different classes. We built a new catalogue of 1580 candidate blazars with a rich multi-wavelength data-set, filling the lack of low Galactic latitude sources in current blazar catalogues. This will be particularly important to identify the source population of high energy neutrinos or ultra-high energy cosmic rays, or to verify the Gaia optical reference frame. In addition, ALMA Blazar Candidates can be investigated both through optical spectroscopic observation campaigns or through repeated photometric observations for variability studies. In this context, the data collected by the upcoming LSST surveys will provide a key tool to investigate the possible blazar nature of these sources.2020A&A...641A..62Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/641/A62CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/311 : WISE All-Sky Data Release (Cutri+ 2012)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)VII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015)J/MNRAS/485/1188 : The ALMA Calibrator Catalogue (Bonato+, 2019)J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)J/A+A/632/A77 : 3HSP blazars catalog (Chang+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/641/A62https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/641/A62http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/641/A62https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/641/A62https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/641/A62http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/641/A62GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/641/A62/table1 (ACC main properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/641/A62/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/641/A62/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/641/A62/table1?GETtext/xml+votable180.050000true0.549922667-21.8860736670.005555555555555556Cone search capability for table J/A+A/641/A62/catalog (*ABC catalog (merging Tables 2, 4, C1 and C2 of the paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/641/A62/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/641/A62/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/641/A62/catalog?GETtext/xml+votable180.050000true0.549922667-21.8860736670.0055555555555555565/7288 6/198 206 250 344 375 494 546 593 674 839 882 884 904 967 1025 1029 1035 1038 1065 1084 1092-1093 1109 1118 1120-1121 1132 1152 1163 1173 1181 1187 1233 1239 1250 1263 1286 1315-1316 1356 1549 1576 1582 2112 2172 2198-2199 2207 2213-2214 2223 2245 2308 2312 2348 2435 2439 2600 2605 2694 2721 4137 4152 4155 4174 4179 4223 4393 4448 4538 4575 4644 4708 4765 4815 4825 4844 5032 5078 5103 5218 5306 5311 5432 5509 5658 5766 6219 6264 6280 6469 6532 6560 6671 8256 8526 8588 8640-8641 8658 8660 8673 8675 8819 8905 8983 9036 9228 9284 9288 9347 9412 10283 10288 10432 10440 10762 10795 10886 12311 12352 12370 12400 12444 12536 12551 12588 12598 12603 12621 12635 12640 12643 12664 12677 12778 12836 12844 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43233 43256-43257 43259 43272 43281 43283 43338 43412 43418 43432 43447 43453 43466 43469 43528 43533 43563 43567 43584 43586 43591 43605 43607 43616 43646 43662 43696 43707 43717 43739 43757 43786 43828 43835 43840 43854 43862 43876 43891 43918 43954 43967 43978 43995 44028 44068 44088 44091 44099 44106 44118 44122 44131 44140 44153 44155 44169 44185 44193 44199 44208 44265 44272 44313 44335 44338 44358 44377 44381 44421 44441 44475 44482 44484 44502 44523 44526 44542 44546 44554 44574 44649 44670 44681 44700 44714-44715 44717 44724 44729 44735 44742 44761 44791 44809 44815 44845 44873 44885 44896 44907-44908 44911 44921 44955 45026 45062 45065 45094 45099 45108 45110 45123 45162 45198 45214 45216 45235 45250 45259 45262 45297 45358 45371 45395 45400 45434 45446 45451 45483 45490-45492 45497 45511 45513-45514 45522 45540 45548 45567 45571 45586 45600 45604 45619 45621 45645 45647 45665 45695 45698 45728 45761 45763 45770 45784 45811 45816 45823 45833 45835-45836 45874 45907 45914 45928 45947 45950 45955 45957 45964 45972 45982 46000 46002 46040 46102 46109 46119 46157 46174 46186 46194 46203 46215 46259 46265 46354 46356 46379 46390 46394-46395 46398 46419 46468 46499 46569 46612 46619 46659 46686 46709 46728 46762 46772 46782 46789 46801 46831 46835 46859 46939 46993 47008 47080 47104 47107 47122 47124 47202 47205 47207 47237-47238 47249 47277 47282 47304 47343 47383 47408 47433 47442 47447 47453 47455 47470 47478 47498 47504 47513 47585 47600 47607 47618 47663 47675 47744 47796 47847 47864 47978 48053 48126 48143 48147 48153 48182 48224 48268 48274 48310 48362 48384-48385 48421 48434 48480 48513 48533 48538 48542 48552 48605 48618 48646 48648 48652 48666 48677 48714 48724 48729 48738 48821 48841 48867 48890 48939 48952 49002 49049 49070 49079 49097 49135https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/641/A62?format=asciiX-raydefaultJ/A+A/641/A62/table1ACC main propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintABCindicates in ABC catalogmeta.ref.urlcharALMAALMA source name (JHHMM+DDMM)meta.id;meta.maincharprimaryRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainNameNED source namemeta.idcharz? Source redshiftsrc.redshiftfloatnullableTypeSIMBAD source classification (1)src.classcharBibCodeLiterature referencemeta.ref;pos.framecharJ/A+A/641/A62/catalog*ABC catalog (merging Tables 2, 4, C1 and C2 of the paper)XRaySp? X-ray spectrum type (2)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintALMAALMA source name (JHHMM+DDMM)meta.id;meta.maincharRAJ2000Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainz? Source Redshiftsrc.redshiftfloatnullableType? SIMBAD source classification (1)src.classchar4FGL? 4FGL source name (JHHMM.m+DDMM)meta.idcharType4FGL? 4FGL source classificationsrc.classchar3HSP? 3HSP source name (JHHMMSS.s+DDMMSS)meta.idcharWIBRaLS2WISE name of WIBRaLS2 counterpart (JHHMMSS.ss+DDMMSS.s)meta.idcharTypeW? WIBRaLS2 source typesrc.classcharClassW? WIBRaLS2 source classsrc.classcharKDEBLLACSWISE name of KDEBLLACS counterpart (JHHMMSS.ss+DDMMSS.s)meta.idcharXRTobsID? OBSID of Swift-XRT observationmeta.id;obsnullableXRTExp? Exposure of Swift-XRT observationksobs.param;obsfloatnullableXRTCR? 0.3-7keV countrate of Swift-XRT detected counterpart0.001s**-1phot.count;em.X-rayfloatnullablee_XRTCR? Error on 0.3-7keV countrate of Swift-XRT detected counterpart0.001s**-1phot.count;em.X-rayfloatnullableXRTSNR? Signal to noise ratio of Swift-XRT detected counterpartstat.snrfloatnullableXRTFlux? 0.1-2.4keV flux of Swift-XRT detected counterpart1e-16W.m**-2phot.flux;em.X-rayfloatnullablee_XRTFlux? Error on 0.1-2.4keV flux of Swift-XRT detected counterpart1e-16W.m**-2stat.errorfloatnullableXRTGamma? Spectral slope of Swift-XRT detected counterpart1e-16W.m**-2spect.indexfloatnullablee_XRTGamma? Lower error on spectral slope of Swift-XRT detected counterpart1e-16W.m**-2spect.indexfloatnullableE_XRTGamma? Upper error on spectral slope of Swift-XRT detected counterpart1e-16W.m**-2spect.indexfloatnullableXRTK? Power-law normalization of Swift-XRT detected counterpart0.0001keV.cm**-2.s**-1phot.fluxfloatnullablee_XRTK? Lower error on power-law normalization of Swift-XRT detected counterpart0.0001keV.cm**-2.s**-1stat.errorfloatnullableE_XRTK? Upper error on power-law normalization of Swift-XRT detected counterpart0.0001keV.cm**-2.s**-1stat.error;stat.maxfloatnullableXRTChi2? Reduced chi2 of Swift-XRT power-law fitstat.fit.chi2floatnullableXRTDOF? Degrees of freedom of Swift-XRT power-law fitstat.fit.dofintnullableACISobsID? OBSID of Chandra-ACIS observationmeta.id;obsintnullableACISExp? Exposure of Chandra-ACIS observationksobs.param;obsfloatnullableACISCR? 0.3-7keV countrate of Chandra-ACIS detected counterpart0.001s**-1phot.count;em.X-rayfloatnullablee_ACISCR? Error on 0.3-7keV countrate of Chandra-ACIS detected counterpart0.001s**-1phot.count;em.X-rayfloatnullableACISSNR? Signal to noise ratio of Chandra-ACIS detected counterpartstat.snrfloatnullableACISFlux? 0.1-2.4keV flux of Chandra-ACIS detected counterpart1e-16W.m**-2phot.flux;em.X-rayfloatnullablee_ACISFlux? Error on 0.1-2.4keV flux of Chandra-ACIS detected counterpart1e-16W.m**-2stat.errorfloatnullableACISGamma? Spectral slope of Chandra-ACIS detected counterpartspect.indexfloatnullablee_ACISGamma? Lower error on spectral slope of Chandra-ACIS detected counterpartspect.indexfloatnullableE_ACISGamma? Upper error on spectral slope of Chandra-ACIS detected counterpartspect.indexfloatnullableACISK? Power-law normalization of Chandra-ACIS detected counterpart0.0001keV.cm**-2.s**-1phot.fluxfloatnullablee_ACISK? Lower error on power-law normalization of Chandra-ACIS detected counterpart0.0001keV.cm**-2.s**-1stat.errorfloatnullableE_ACISK? Upper error on power-law normalization of Chandra-ACIS detected counterpart0.0001keV.cm**-2.s**-1stat.error;stat.maxfloatnullableACISChi2? Reduced chi2 of Chandra-ACIS power-law fitstat.fit.chi2floatnullableACISDOF? Degrees of freedom of Chandra-ACIS power-law fitstat.fit.dofintnullableEPICobsID? OBSID of XMM-EPIC observationmeta.id;obsnullableEPICExp? Exposure of XMM-EPIC observationksobs.param;obsfloatnullableEPICCR? 0.3-7keV countrate of XMM-EPIC detected counterpart0.001s**-1phot.count;em.X-raydoublenullablee_EPICCR? Error on 0.3-7keV countrate of XMM-EPIC detected counterpart0.001s**-1phot.count;em.X-rayfloatnullableEPICSNR? Signal to noise ratio of XMM-EPIC detected counterpartstat.snrfloatnullableEPICFlux? 0.1-2.4keV flux of XMM-EPIC detected counterpart1e-16W.m**-2phot.flux;em.X-rayfloatnullablee_EPICFlux? Error on 0.1-2.4keV flux of XMM-EPIC detected counterpart1e-16W.m**-2stat.errorfloatnullableEPICGamma? Spectral slope of XMM-EPIC detected counterpartspect.indexfloatnullablee_EPICGamma? Lower error on spectral slope of XMM-EPIC detected counterpartspect.indexfloatnullableE_EPICGamma? Upper error on spectral slope of XMM-EPIC detected counterpartspect.indexfloatnullableEPICK? Power-law normalization of XMM-EPIC detected counterpart0.0001keV.cm**-2.s**-1phot.fluxfloatnullablee_EPICK? Lower error on power-law normalization of XMM-EPIC detected counterpart0.0001keV.cm**-2.s**-1stat.errorfloatnullableE_EPICK? Upper error on power-law normalization of XMM-EPIC detected counterpart0.0001keV.cm**-2.s**-1stat.error;stat.maxfloatnullableEPICChi2? Reduced chi2 of XMM-EPIC power-law fitstat.fit.chi2floatnullableEPICDOF? Degrees of freedom of XMM-EPIC power-law fitstat.fit.dofintnullableLAMOST? LAMOST DR5 counterpart name (JHHMMSS.ss+DDMMSS.s)meta.idcharTypeL? LAMOST DR5 counterpart spectral typesrc.classcharzL? LAMOST DR5 counterpart redshiftsrc.redshiftdoublenullablee_zL? Error on LAMOST DR5 counterpart redshiftstat.errordoublenullableSDSS? SDSS DR12 counterpart name (JHHMMSS.ss+DDMMSS.s)meta.idcharTypeS? SDSS DR12 counterpart spectral typesrc.classcharzS? SDSS DR12 counterpart redshiftsrc.redshift;pos.heliocentricfloatnullablee_zS? Error on SDSS DR12 counterpart redshiftstat.errordoublenullableOptClass? Source optical spectral class (3)src.classcharWISE? WISE counterpart name (JHHMMSS.ss+DDMMSS.s)meta.idcharWISECdCl? Gamma-ray blazar candidate class (4)src.classchar