J/ApJ/754/38ivo://CDS.VizieR/J/ApJ/754/38doi:10.26093/cds/vizier.17540038CDSChand H.Gopal-Krishna2017-10-16T14:58:17Z2014-03-28T12:11:59ZCDS support team

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

cds-question@unistra.frquasarsline-intensitiesredshiftedspectroscopyradio-sourcesThe conventional wisdom that the rate of incidence of MgII absorption systems, dN/dz (excluding "associated systems" having a velocity {beta}c relative to the active galactic nucleus (AGN) of less than ~5000km/s), is totally independent of the background AGNs has been challenged by a recent finding that dN/dz for strong MgII absorption systems toward distant blazars is 2.2+/-^0.8^_0.6_ times the value known for normal optically selected quasars (QSOs). This has led to the suggestion that a significant fraction of even the absorption systems with {beta} as high as ~0.1 may have been ejected by the relativistic jets in the blazars, which are expected to be pointed close to our direction. Here, we investigate this scenario using a large sample of 115 flat-spectrum radio-loud quasars (FSRQs) that also possess powerful jets, but are only weakly polarized. We show, for the first time, that dN/dz toward FSRQs is, on the whole, quite similar to that known for QSOs and that the comparative excess of strong MgII absorption systems seen toward blazars is mainly confined to {beta}<0.15. The excess relative to FSRQs probably results from a likely closer alignment of blazar jets with our direction; hence, any gas clouds accelerated by them are more likely to be on the line of sight to the active quasar nucleus.2012ApJ...754...38Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/754/38CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)J/A+A/546/A67 : Catalog of strong MgII absorbers (Lawther+, 2012)J/ApJ/748/131 : MgII absorbers in SDSS-DR7 quasar catalog (Shen+, 2012)J/ApJ/732/110 : SDSS 2175{AA} extinction bump candidates (Jiang+, 2011)J/ApJ/714/1521 : Spectroscopy of galaxies around distant QSOs (Chen+, 2010)J/ApJ/698/819 : MgII and LRGs cross-correlation analysis (Lundgren+, 2009)J/ApJ/679/239 : Associated MgII absorbers (Vanden+, 2008)J/ApJS/171/61 : All-Sky Survey of FSRQs - CRATES (Healey+, 2007)J/ApJ/660/1093 : Weak MgII absorbers at 0.4<z<2.4 (Narayanan+, 2007)J/ApJ/639/766 : SDSS-DR3 strong MgII absorbers (Prochter+, 2006)J/MNRAS/354/L25 : MgII absorbers in SDSS QSOs (Bouche+, 2004)J/AJ/106/848 : QSO MgII absorption line systems (Drinkwater+, 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/754/38https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/754/38http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/754/38https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/754/38https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/754/38http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/754/38GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/754/38/table2 (Basic properties of our sample of 115 (nonblazar) Flat-Spectrum Radio Quasars (FSRQs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/754/38/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/754/38/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/754/38/table2?GETtext/xml+votable180.050000true2.8770830.9308330.0055555555555555566/175 2348 3971 4027 4436 4448 4696 4820 4850 6576 6853 7709 8709 8858 10103 13625 17011 17094 17110 17212 17414 17618 17693 17927 17979 18002 18005 18084 18092 18504 18669 18756 18871 19027 19085 19101 19190 19202 20607 21131 21170 21768 21790 23304 23306 24809 24854 24941 25094 25174 25256 25302 25427 25501 25750 25829 26245 26614 26966 27310 27423 27514 27857 27909 28208 28258 31157 31520 34146 34485 34517 34568 34570 34669 35281 35522 35769 35801 35806 35897 36005 36130 36230 36417 36655 36840 36863 38646 38744 38787 39664 40060 43936 44000 44034 44269 44293 44555 44563 44658 44799 45393 46251 46373 46542 46921 46964 47016 47080 47941 48407 48582 48589 48610 487573.180513520130092e-24 3.180513520130092e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/754/38?format=asciiOpticalRadiodefaultJ/ApJ/754/38/table2Basic properties of our sample of 115 (nonblazar) Flat-Spectrum Radio Quasars (FSRQs)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameFlat spectrum radio quasar (FSRQ) namemeta.numbercharprimaryMDisplay the MgII(2796{AA}) redshifts and equivalent widths from table 3meta.ref.urlcharzem[0.6/3.8] NED emission redshiftsrc.redshiftdoublealpha[-0.5/1.3] Radio spectral index {alpha} (G1)spect.indexfloatF4.8[89/10938] The CRATES (Cat. J/ApJS/171/61) 4.8GHz flux densitymJyphot.flux.density;em.radio.3-6GHzintmag[16/21] Veron-Cetty & Veron 2010, Cat. VII/258, magnitude in filter Fmagphot.magfloatF[OPBVRI] Photometry filter (1)meta.code;instr.filtercharDz(w)Redshift path {Delta}z for weak system (2)src.redshift;arith.difffloatNwNumber of weak systems above 5{sigma} (3)meta.numberintDz(s)Redshift path {Delta}z for strong system (4)src.redshift;arith.difffloatNsNumber of strong systems above 5{sigma} (5)meta.numberintRefReference code (G2)meta.noteintCatCross-match within 10" with Narayanan et al. 2007 (J/ApJ/660/1093) and Healey et al. 2008 (J/ApJS/175/97)meta.ref.urlintnullableVV10Display the Veron data 2010, Cat. VII/258meta.ref.urlcharCRATESDisplay the CRATES data (Healey et al. 2007, J/ApJS/171/61)meta.ref.urlchar_RAPositions from Name (right ascension part)degpos.eq.ra;meta.main_DEPositions from Name (declination part)degpos.eq.dec;meta.mainJ/ApJ/754/38/table3MgII absorption systems and their rest-frame equivalent widths, W_r_(MgII2796)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameFlat spectrum radio quasars namemeta.id;meta.maincharzem[0.7/3.8] NED emission redshiftsrc.redshiftfloatzabs[0.2/2.7] Absorption redshift of MgII systemsrc.redshiftfloatEW[0.3/5.4] MgII 2796 rest-frame equivalent width; in Angstrom units0.1nmspect.line.eqWidthfloate_EWError in EW0.1nmstat.error;spect.line.eqWidthfloatalphaRadio spectral index {alpha} (G1)spect.index;em.radiofloatF4.8[89/4135] The CRATES (Cat. J/ApJS/171/61) 4.8GHz flux densitymJyphot.flux.density;em.radio.3-6GHzfloatSNR[9/303]? Signal-to-noise ratio (1)stat.snrfloatnullableRefReference code (G2)meta.noteint