J/A+A/577/A36ivo://CDS.VizieR/J/A+A/577/A36doi:10.26093/cds/vizier.35770036CDSMantovani F.Bondi M.Mack K.-H.Alef W.Ros E.Zensus J.A.2017-11-28T13:21:59Z2015-08-05T09:50:13ZCDS support team

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

cds-question@unistra.frquasarsactive-galactic-nucleibl-lacertae-objectsradio-sourcesWe started a follow-up investigation of the "Deep X-ray Radio Blazar Survey" objects with declination >-10{deg} to better understand the blazar phenomenon. We undertook a survey with the European Very Long Baseline Interferometry Network at 5GHz to make the first images of a complete sample of weak blazars, aiming at a follow-up comparison between high- and low-power samples of blazars. We observed 87 sources with the EVN at 5GHz during the period October 2009 to May 2013. The observations were correlated at the Max-Planck-Institut fuer Radioastronomie and at the Joint Institute for VLBI in Europe. The correlator output was analysed using both the AIPS and DIFMAP software packages. All of the sources observed were detected. Point-like sources are found in 39 cases on a milli-arcsecond scale, and 48 show core-jet structure. The total flux density distribution at 5GHz has a median value <S>=44^+23^_-10_mJy. A total flux density <=150mJy is observed in 68 out of 87 sources. Their brightness temperature T_b_ ranges between 10^7^K and 10^12^K. According to the spectral indices previously obtained with multi-frequency observations, 58 sources show a flat spectral index, and 29 sources show a steep spectrum or a spectrum peaking at a frequency around 1-2GHz. Adding to the DXRBS objects we observed those already observed with ATCA in the Southern sky, we found that 14 blazars and a Steep Spectrum Radio Quasars, are associated to {gamma}-ray emitters. We found that 56 sources can be considered blazars. We also detected 2 flat spectrum narrow line radio galaxies. About 50% of the blazars associated to a {gamma}-ray object are BLLacs, confirming that they are more likely detected among blazars {gamma}-emitters. We confirm the correlation found between the source core flux density and the {gamma}-ray photon fluxes down to fainter flux densities. We also found that weak blazars are also weaker {gamma}-ray emitters compared to bright blazars. Twenty-two sources are SSRQs or Compact Steep-spectrum Sources, and 7 are GigaHz Peaked Sources. The available X-ray ROSAT observations allow us to suggest that CSS and GPS quasars are not obscured by large column of cold gas surrounding the nuclei. We did not find any significant difference in X-ray luminosity between CSS and GPS quasars.2015A&A...577A..36Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/577/A36CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/115/1253 : Deep X-Ray Radio Blazar Survey (DXRBS). I. (Perlman+ 1998)J/MNRAS/323/757 : Deep X-Ray Radio Blazar Survey (DXRBS). II. (Landt+, 2001)VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/577/A36https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/577/A36http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/577/A36https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/577/A36https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/577/A36http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/577/A36GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/577/A36/table3 (Derived parameters of the observed DXRBS sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/577/A36/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/577/A36/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/577/A36/table3?GETtext/xml+votable180.050000true3.900092830.87494310.0055555555555555566/158 556 4255 4260 4594 4695 5305 5870 6093 6244 7220 7280 7492 7618 7860 7904 8511 8562 8716 8950 9146 9219 9636 10047 10216 10386 10529 10642 10710 11027 11037 11410 11508 11536 15260 17637 18155 18184 18640 18763 18795 19603 19617 20164 20327 21704 21763 22722 22724 22857 22914 22979 23025 23210 23526 24099 24123 25542 25832 26089 26097 26100 26207 26859 26866 26873 26975 27133 27206 27520 27595 27715 27718 27862 28471 28481 28485 28495 28498 28516 28538 31243 31991 32686 36780 407953.313034785154005e-24 3.313034785154005e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/577/A36?format=asciiRadiodefaultJ/A+A/577/A36/table3Derived parameters of the observed DXRBS sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameBlazar source name (JHHMM.m+DDMM) <1WGA JHHMM.m+DDMM> in Simbadmeta.id;meta.maincharCodeEVN (European VLBI Network) observation codemeta.id;instrcharStot[0.5/2378] Total flux density at 5GHzmJyphot.flux.density;em.radio.3-6GHzfloatrms[0.02/20] Image rms error (in mJy/beam)mJyinstr.det.noisefloataMaj[1.7/21] Beam major axis {theta}_max_masphys.angSizefloataMin[1/6] Beam minor axis {theta}_min_masphys.angSize;instr.beamfloatPA[-90/90]? Position angle of beam major axisdegpos.posAng;instr.beamfloatnullableStr[p cj t?] source structure: p=point, cj=core-jet, t=triplemeta.code;src.morphcharScore[0.4/2410] Core flux density obtained by JMFITmJyphot.flux.density;em.radiofloatcMaj[0/14] Core major axis {theta}_max_ after beam deconvolutionmasphys.angSizefloatcMin[0/6] Core minor axis {theta}_min_ after beam deconvolutionmasphys.angSize;instr.beamfloatPAc[0/180]? Core major axis position angledegpos.posAngintnullableTb[0/108]? Brightness temperature (1)1e+10Kphys.temperaturedoublenullableR[0/4]? EVN to Effelsberg flux density ratiophot.flux;arith.ratiofloatnullableDXRBSDetails from DXRBS about this blazarmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main