J/ApJ/764/135ivo://CDS.VizieR/J/ApJ/764/135doi:10.26093/cds/vizier.17640135CDSShaw M.S.Romani R.W.Cotter G.Healey S.E.Michelson P.F.,Readhead A.C.S.Richards J.L.Max-Moerbeck W.King O.G.Potter W.J.2018-01-05T08:55:44Z2015-08-03T10:57:52ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsredshiftedspectroscopygamma-ray-astronomyWe report on spectroscopic observations covering most of the 475 BL Lacs in the second Fermi Large Area Telescope (LAT) catalog of active galactic nuclei (AGNs). Including archival measurements (correcting several erroneous literature values) we now have spectroscopic redshifts for 44% of the BL Lacs. We establish firm lower redshift limits via intervening absorption systems and statistical lower limits via searches for host galaxies for an additional 51% of the sample leaving only 5% of the BL Lacs unconstrained. The new redshifts raise the median spectroscopic {overline}{Z} from 0.23 to 0.33 and include redshifts as large as z=2.471. Spectroscopic redshift minima from intervening absorbers have {overline}{Z}, showing a substantial fraction at large z and arguing against strong negative evolution. We find that detected BL Lac hosts are bright ellipticals with black hole masses M_{bullet}_~10^8.5^-10^9^, substantially larger than the mean of optical AGNs and LAT Flat Spectrum Radio Quasar samples. A slow increase in M_{bullet}_ with z may be due to selection bias. We find that the power-law dominance of the optical spectrum extends to extreme values, but this does not strongly correlate with the {gamma}-ray properties, suggesting that strong beaming is the primary cause of the range in continuum dominance.2013ApJ...764..135Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/764/135CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/562/A64 : Fermi detection of BL Lac objects (Wu+, 2014)J/AJ/145/31 : Catalog of X-ray selected BL Lac objects (Kapanadze+, 2013)J/A+A/538/A26 : BL Lac objects beyond z=1.3 (Rau+, 2012)J/ApJ/748/49 : Optical spectroscopy of 1LAC broad-line blazars (Shaw+, 2012)J/ApJS/199/31 : Fermi LAT second source catalog (2FGL) (Nolan+, 2012)J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)J/ApJ/743/171 : The 2LAC catalog (Ackermann+, 2011)J/ApJ/709/1407 : SED of the Fermi blazars (Li+, 2010)J/AJ/139/390 : Opt. selected BL Lac objects from SDSS-DR7 (Plotkin+, 2010)J/ApJS/175/97 : Survey of {gamma}-ray blazar candidates (Healey+, 2008)J/A+A/466/63 : VLBI observations of BL Lac objects (Wu+, 2007)J/A+A/445/441 : SED of BL Lacertae objects (Nieppola+, 2006)J/AJ/129/2542 : BL Lac from SDSS (Collinge+, 2005)J/AJ/129/2138 : Centers of early-type galaxies with HST (Lauer+, 2005)J/A+A/401/927 : The HRX-BL Lac sample (Beckmann+, 2003)J/MNRAS/277/1477 : A catalogue of BL Lacertae objects (Padovani+ 1995)J/A+AS/98/393 : 1Jy BL Lac Objects: Observational Data (Stickel+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/764/135https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/764/135http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/764/135https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/764/135https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/764/135http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/764/135GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/764/135/table3 (BL Lac spectral properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/764/135/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/764/135/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/764/135/table3?GETtext/xml+votable180.050000true0.32501694-7.774111110.0055555555555555566/100 250 514 716 770 851 1085 1120 1622 1700 1915 2028 2094 2100 2122 2140 2295 2414 2484 2636 2792 2808 3017 3096 3431 3492 3569 3784 3876 3882 4134 4255 4312 4543 4601 4685 4855 4865 4866 4882 4960 4964 5072 5098 5361 5462 5483 5516 5614 5723 5776 5836 5918 5990 6015 6021 6067 6088 6110 6507 6515 6559 6636 6647 6723 6787 6815 6822 6888 6963 6996 7091 7235 7285 7315 7354 7448 7475 7518 7553 7655 7758 7764 7896 8100 8177 8321 8374 8487 8615 8746 8818 8915 8945 8955 8972 9013 9196 9501 9566 9773 10046 10071 10119 10183 10198 10280 10512 10524 10605 10612 10625 10669 10780 10800 10801 10843 10910 10921 10994 11153 11209 11212 11242 11321 11323 11374 11385 11396 11430 11444 11522 11649 11682 11912 11975 12218 12323 12599 13098 13179 13353 13406 13410 13613 13640 13664 13673 13711 13743 13867 14608 14641 14751 14797 15211 15269 15286 15305 15490 15761 15916 15917 15955 15998 16057 16170 16272 16510 16532 16665 16736 16796 16816 17048 17347 17516 17579 17611 17842 17917 17994 18070 18119 18210 18253 18270 18315 18402 18457 18853 18889 19023 19037 19143 19487 19523 19723 19724 19756 19789 19878 19907 19989 20006 20016 20049 20141 20202 20325 20611 20777 20836 20888 20908 20920 21160 21179 21493 21574 21793 21968 21972 22083 23011 23015 23127 23181 24027 24112 24123 24260 24902 25239 25389 25409 25910 26036 26203 26242 26254 26256 26483 26539 26550 26565 26695 26798 26964 26983 27056 27082 27138 27217 27311 27472 27523 27524 27846 28101 28117 28139 28199 28225 28342 28352 28388 28454 28492 28498 28517 28836 28971 29620 29729 29754 29952 30012 30015 30036 30570 30842 30928 31362 31485 31656 31663 31773 31930 31967 32034 32068 32174 32247 32261 32311 32581 32605 32611 32712 32904 33040 33046 33356 33370 33412 33744 33825 33880 33968 34038 34163 34317 34461 34528 34747 34767 34779 35076 35252 35501 35700 35722 35786 35981 36882 37045 37529 37994 38355 38481 38918 38937 39505 40174 40689 40766 40811 40874 40885 41363 41988 42188 42515 42571 42914 43085 43116 43122 43380 43447 43596 44059 44170 44340 44669 44813 45774 46204 46258 46740 46787 46872 47248 47413 47708 47714 47969 48624 48885 49037 49141https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/764/135?format=asciiGamma-rayOpticaldefaultJ/ApJ/764/135/table3BL Lac spectral propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2FGL2FGL catalog identifier (JHHMM.m+DDMM)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainNameSource name (JHHMM+DDMM)meta.idcharlogFlog(spectral flux) at ~598nm (1)log(10uJy)phot.fluxfloate_logFUncertainty in logFlog(10uJy)stat.errorfloatalpha[-6.5/3] Spectral index {alpha} (1)spect.indexfloate_alpha? Uncertainty in alphastat.error;pos.eq.rafloatnullableRMag[-24.3/-21]? Absolute R band magnitudemagphys.magAbs;em.opt.Rfloatnullablee_RMag[0.08/0.4]? Uncertainty in RMagmagstat.error;phot.mag;em.opt.Rfloatnullablez[0.01/2.5]? Spectroscopic redshiftsrc.redshiftfloatnullableu_zSystematic uncertainty flag in z; see textmeta.code.error;src.redshiftcharn_zRedshift method for z (2)meta.notecharzmin? Spectroscopic lower redshift limit (3)src.redshiftfloatnullablez22.5? Minimum redshift assuming M_R_=-22.5magsrc.redshift;pos.heliocentricfloatnullablez22.9? Minimum redshift assuming M_R_=-22.9magsrc.redshift;pos.heliocentricfloatnullablezmaxSpectroscopic upper redshift limitsrc.redshiftfloatTypeSource type (4)src.classcharSEDSpectral energy distribution type (5)src.spType;instr.bandwidthcharTelTelescope used to obtain the data (6)instr.setupcharMJDModified Julian Date of the observationdtime.epochintSimbadSimbad column added by the CDSmeta.ref.urlcharNEDSimbad column added by the CDSmeta.ref.urlchar