The 2WHSP catalog J/A+A/598/A17 ivo://CDS.VizieR/J/A+A/598/A17 doi:10.26093/cds/vizier.35980017 CDS Chang Y.-L. Arsioli B. Giommi P. Padovani P. 2022-02-04T11:56:24Z 2017-01-25T07:46:56Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr active-galactic-nuclei gamma-ray-astronomy High Synchrotron Peaked blazars (HSPs) dominate the gamma sky at energies larger than a few GeV; however, only a few hundred blazars of this type have been catalogued so far. In this paper we present the 2WHSP sample, the largest and most complete list of HSP blazars available to date, which is an expansion of the 1WHSP catalog of gamma-ray source candidates off the Galactic plane. We cross-matched a number of multi-wavelength surveys (in the radio, infrared and X-ray bands) and applied selection criteria based on the radio to IR and IR to X-ray spectral slopes. To ensure the selection of genuine HSPs we examined the SED of each candidate and estimated the peak frequency of its synchrotron emission ({nu}_peak_) using the ASDC SED tool, including only sources with {nu}_peak_>10^15^Hz (equivalent to {nu}_peak_>4eV). We have assembled the largest and most complete catalog of HSP blazars to date, which includes 1691 sources. A number of population properties, such as infrared colours, synchrotron peak, redshift distributions, and gamma-ray spectral properties, have been used to characterise the sample and maximize completeness. We also derived the radio logN-logS distribution. This catalog has already been used to provide seeds to discover new very high energy objects within Fermi-LAT data and to look for the counterparts of neutrino and ultra high energy cosmic ray sources, showing its potential for the identification of promising high-energy gamma, sources and multi-messenger targets. 2017A&A...598A..17C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/598/A17 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to VII/274 : The Roma BZCAT - 5th edition (Massaro+, 2015) J/ApJS/188/405 : Fermi-LAT first source catalog (1FGL) (Abdo+, 2010) J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012) J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/598/A17 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/598/A17 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/598/A17 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/598/A17 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/598/A17 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/598/A17 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/598/A17/2whsp (The 2WHSP catalog (table 4)) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/598/A17/2whsp? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/598/A17/2whsp? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/598/A17/2whsp? 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46510 46542 46564 46629 46793 46823 46910 46918 46924 46992 46994 47014 47017 47101 47130 47149 47152 47199 47319 47375 47398 47424-47425 47450 47461 47479 47497 47575 47586 47877 47960 48090 48174 48201 48223 48245 48259 48284 48316 48353 48403 48408 48419 48443 48447 48477 48498 48504 48536 48576 48596 48603 48608 48624 48629 48676 48683 48752 48778 48829-48830 48915 48920 48933 48985 49068 49141-49142 49151 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/598/A17?format=ascii Gamma-ray default J/A+A/598/A17/2whsp The 2WHSP catalog (table 4) recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int 2WHSPJ Name of the object (HHMMSS.s+DDMMSS) meta.id;meta.main char u_2WHSPJ [*] Uncertainty flag on 2WHSPJ meta.code.error char 5BZCat 5BZCat source meta.id;meta.dataset char l_lognupeak Limit flag on lognupeak (1) meta.code.error char lognupeak Synchrotron peak log(Hz) em.freq float u_lognupeak [*] Uncertainty flag on lognupeak meta.code.error char l_lognufnu Limit flag on lognufnu (1) meta.code.error char lognufnu Synchrotron peak flux (log(erg/s/cm2)) log(mW.m**-2) phot.flux float u_lognufnu [*] Uncertainty flag on lognufnu meta.code.error char l_z Limit flag on z meta.code.error;src.redshift char z ? Redshift src.redshift float nullable u_z [*] Uncertainty flag on z meta.code.error;src.redshift char r_z [bcdefg] Reference on z (2) meta.ref;pos.frame char Fermi-LAT Fermi gamma-ray detection (3) meta.id char GAMMA ? Fermi gamma-ray photon index spect.index float nullable e_GAMMA ? Photon index error stat.error float nullable 2FHL 2FHL source name (HHMM.m+DDd, J2000) meta.id char FOM Figure of Merit meta.bib.fig float Simbad Simbad column added by the CDS meta.ref.url char _RA Position from name (right ascension part) deg pos.eq.ra;meta.main _DE Position from name (declination part) deg pos.eq.dec;meta.main