J/ApJ/732/116ivo://CDS.VizieR/J/ApJ/732/116doi:10.26093/cds/vizier.17320116CDSMalmrose M.P.Marscher A.P.Jorstad S.G.Nikutta R.Elitzur M.2018-01-04T08:22:57Z2012-12-05T14:45:12ZCDS support team

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

cds-question@unistra.frquasarsbl-lacertae-objectsinfrared-astronomyspectroscopyA possible source of {gamma}-ray photons observed from the jets of blazars is inverse Compton scattering by relativistic electrons of infrared seed photons from a hot, dusty torus in the nucleus. We use observations from the Spitzer Space Telescope to search for signatures of such dust in the infrared spectra of four {gamma}-ray bright blazars, the quasars 4C 21.35, CTA102, and PKS 1510-089, and the BL Lacertae object ON231. The spectral energy distribution (SED) of 4C 21.35 contains a prominent infrared excess indicative of dust emission. After subtracting a non-thermal component with a power-law spectrum, we fit a dust model to the residual SED. The model consists of a blackbody with temperature ~1200K, plus a much weaker optically thin component at ~660K. The total luminosity of the thermal dust emission is 7.9+/-0.2x10^45^erg/s. If the dust lies in an equatorial torus, the density of infrared photons from the torus is sufficient to explain the {gamma}-ray flux from 4C 21.35 as long as the scattering occurs within a few parsecs of the central engine. We also report a tentative detection of dust in the quasar CTA102, in which the luminosity of the infrared excess is 7+/-2x10^45^erg/s. However, in CTA102 the far-infrared spectra are too noisy to detect the 10um silicate feature. Upper limits to the luminosity from thermal emission from dust in PKS 1510-089, and ON231, are 2.3x10^45^, and 6.6x10^43^erg/s, respectively. These upper limits do not rule out the possibility of inverse Compton upscattering of infrared photons to {gamma}-ray energies in these two sources.2011ApJ...732..116Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/732/116CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/225 : Catalog of Infrared Observations, Edition 5 (Gezari+ 1999)J/A+A/537/A99 : Large Quasar Astrometric Catalogue 2 (LQAC-2) (Souchay+, 2012)J/other/NewA/16.503 : 2MASS observation of BL Lac objects II. (Mao+, 2011)J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)J/MNRAS/405/2062 : AGN candidates from 2MASS/ROSAT catalogs (Kouzuma+, 2010)J/AJ/121/2843 : QSOs in 2MASS incremental release DR2 (Barkhouse+, 2001)J/A+AS/143/357 : Tuorla Quasar Monitoring (Katajainen+ 2000)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/732/116https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/732/116http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/732/116https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/732/116https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/732/116http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/732/116GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/732/116/table1 (Luminosity distances and dates of observations for the four blazars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/732/116/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/732/116/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/732/116/table1?GETtext/xml+votable180.050000true186.226873321.37957780.0055555555555555566/19398 28083 28492 44908https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/732/116?format=asciiInfrareddefaultJ/ApJ/732/116/table1Luminosity distances and dates of observations for the four blazarsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharprimarySpIR spectrameta.ref.urlcharDistLuminosity distanceGpcpos.distance;pos.heliocentricfloatEp[1/2]time.epochintIRS.dateIRS observation datetime.epoch;obsnullableMIPS.dateMIPS observation datetime.epochnullableIRAC.dateIRAC observation datetime.epochnullableSimbadSimbad column added by the CDSmeta.refcharNEDSimbad column added by the CDSmeta.refchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/732/116/spectraEpoch 1 and 2 Spitzer datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharprimaryInstSpitzer instrument usedinstr.setupcharlam1Wavelength in epoch 1umtime.epoch;em.wldoubleF1? Flux density in epoch 1Jyphot.fluxdoublenullablee_F1? Error in F1Jystat.errordoublenullablelam2Wavelength in epoch 2umtime.epoch;em.wldoubleF2? Flux density in epoch 2Jyphot.fluxdoublenullablee_F2? Error in F2Jystat.errordoublenullable