J/A+A/598/A134ivo://CDS.VizieR/J/A+A/598/A134doi:10.26093/cds/vizier.35980134CDSArsioli B.Chang Y.-L.2022-02-04T12:00:12Z2017-07-13T08:50:56ZCDS support team

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

cds-question@unistra.frgamma-ray-astronomybl-lacertae-objectsA direct search of {gamma}-ray emission centered on multifrequency selected candidates is a valuable complementary approach to the standard search adopted in current {gamma}-ray Fermi-LAT catalogs. Our sources are part of the 2WHSP sample that was assembled with the aim of providing targets for Imaging Atmospheric Cherenkov Telescopes (IACT). A likelihood analysis based on their known position enabled us to detect 150 {gamma}-ray excess signals that have not yet been reported in previous {gamma}-ray catalogs (1FGL, 2FGL, 3FGL). By identifying new sources, we solve a fraction of the extragalactic isotropic {gamma}-ray background (IGRB) composition, improving the description of the {gamma}-ray sky. We perform data reduction with the Fermi Science Tools using positions from 400 high synchrotron peaked (HSP) blazars as seeds of tentative {gamma}-ray sources; none of them have counterparts from previous 1FGL, 2FGL and 3FGL catalogs. Our candidates are part of the 2WHSP sample (currently the largest set of HSP blazars). We focus on HSPs characterized by bright synchrotron component with peak flux {nu}f_({nu})_>=10^-12.1^erg/cm^2^/s, testing the hypothesis of having a {gamma}-ray source in correspondence to the WHSP positions. Our likelihood analysis considers the 0.3-500GeV energy band, integrating over 7.2yr of Fermi-LAT observation and making use of the Pass 8 data release. From the 400 candidates tested, a total of 150 2WHSPs showed excess {gamma}-ray signature: 85 high-significance detections with test statistic (TS)>25, and 65 lower-significance detections with TS between 10 to 25. We assume a power law spectrum in the 0.3-500GeV band and list the spectrum parameters describing all 150 new {gamma}-ray sources. We study the {gamma}-ray photon spectral index distribution, the likelihood of detection according to the synchrotron peak brightness (figure of merit parameter), and plot the measured {gamma}-ray LogN-LogS of HSP blazars, also discussing the portion of the IGRB that has been resolved by the present work. We also report on four cases where we could resolve source confusion and find counterparts for unassociated 3FGL sources with the help of high-energy TS maps together with multifrequency data. The 150 new {gamma}-ray sources are named with the acronym 1BIGB for the first version of the Brazil ICRANet Gamma-ray Blazar catalog, in reference to the cooperation agreement supporting this work.2017A&A...598A.134Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/598/A134CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/598/A17 : The 2WHSP catalog (Chang+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/598/A134https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/598/A134http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/598/A134https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/598/A134https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/598/A134http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/598/A134GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/598/A134/tablea1 (The 150 new gamma-ray signatures detected down to TS>10 level)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/598/A134/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/598/A134/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/598/A134/tablea1?GETtext/xml+votable180.050000true2.45708-43.280560.005555555555555556Cone search capability for table J/A+A/598/A134/tablea2 (*List of 30 2WHSPs detected with the largest significance within our gamma-ray likelihood analysis, all having TS>45 based Pass 8 Fermi-LAT data when integrating over 7.2yr of observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/598/A134/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/598/A134/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/598/A134/tablea2?GETtext/xml+votable180.050000true220.651667-46.3833330.0055555555555555566/29 49 115 137 717 975 1704 2249 3351 4040 4098 4190 4642 4672 4705 4974 5657 5939 6204 6362 6625 7265 7613 7681 8008 8134 8258 8267 8374 8789 9168 9383 9694 9860 9991 10154 10258 10756 10766 10852 11321 11572 11778 12433 12973 13534 13546 14962 16015 16740 17188 17519 17721 17820 18498 18513 18760 18992 19034 19405 19558 19786 19870 20438 20546 20670 20696 20888 20918 21454 22608 22611 23085 23208 23231 23516 24737 25187 25203 25209 25510 25849 26134 26176 26248 26569 26571 26787 26986 27021 27053 27631 27722 28432 29313 30894 31177 31318 31636 31679 32244 32344 32442 32990 33606 33609 34214 34250 34285 34420 34464 34617 34721 34759 35311 35356 35489 35630 35905 36366 36779 37523 38389 39012 40351 40809 41155 41187 41966 43421 43630 44289-44290 44379 44474 44477 44533 44820 45016 45214 45543 45812 46090 46918 46924 48090 48504 48629https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/598/A134?format=asciiGamma-raydefaultJ/A+A/598/A134/tablea1The 150 new gamma-ray signatures detected down to TS>10 levelrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint1BIGBSource name (JHHMMSS.d+DDMMSS) (1)meta.id;meta.maincharn_1BIGB[abc ] Note on 1BIGB (2)meta.notecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainl_zLower limit flag on z (3)meta.code.error;src.redshiftcharzRedshift from literature (4)src.redshiftfloatu_z[?] Uncertainty flag on zmeta.code.error;src.redshiftcharGAMMASpectral photon index (5)spect.indexfloate_GAMMArms uncertainty on GAMMAstat.errorfloatN0N0 parameter (5)1e-13ph.cm**-2.s**-1.MeV**-1stat.fit.paramfloate_N0rms uncertainty on N01e-13ph.cm**-2.s**-1.MeV**-1stat.errorfloatTSTest statisticstat.fit.paramfloatSimbadSimbad column added by the CDSmeta.ref.urlcharFluxPhoton counts calculated by integrating Eq. (1) along the energy range 1-100 GeV (Flux_1-100GEv_)1e-10ph.cm**-2.s**-1phot.flux.density;em.gamma.hardfloatNote[*] * indicates sources with re-evaluated parameters in tablea2meta.notecharJ/A+A/598/A134/tablea2*List of 30 2WHSPs detected with the largest significance within our gamma-ray likelihood analysis, all having TS>45 based Pass 8 Fermi-LAT data when integrating over 7.2yr of observationsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2WHSP2WHSP source name (JHHMMSS.s+DDMMSS)meta.id;meta.maincharn_2WHSP[*] Note on 2WHSP (1)meta.notecharGAMMASpectral photon index (2)spect.indexfloate_GAMMArms uncertainty on GAMMAstat.errorfloatN0pre-factor parameter N0 (2)1e-13ph.cm**-2.s**-1.MeV**-1stat.fit.paramfloate_N0rms uncertainty on N01e-13ph.cm**-2.s**-1.MeV**-1stat.errorfloatTS4yrTest statistic based on Pass 7 data, integrating over the first 4yr of missionstat.fit.paramfloatFluxIntegral flux in the 1-100GeV energy band1e-10ph.cm**-2.s**-1phot.flux.density;em.gamma.hardfloat_RAPositions from 2WHSP name (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2WHSP name (declination part)degpos.eq.dec;meta.main