J/MNRAS/473/5154ivo://CDS.VizieR/J/MNRAS/473/5154doi:10.26093/cds/vizier.74735154CDSMishra S.Chand H.Gopal-KrishnaJoshi R.Shchekinov Y.A.,Fatkhullin T.A.2024-08-18T20:16:57Z2021-02-10T15:43:01ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleibl-lacertae-objectsquasarsredshiftedline-intensitiesIt is widely believed that the cool gas clouds traced by MgII absorption, within a velocity offset of 5000km/s relative to the background quasar are mostly associated with the quasar itself, whereas the absorbers seen at larger velocity offsets towards us are intervening absorber systems and hence their existence is completely independent of the background quasar. Recent evidence by Bergeron et al. (2011A&A...525A..61P, hereinafter BBM) has seriously questioned this paradigm, by showing that the number density of intervening MgII absorbers towards the 45 blazars in their sample is nearly two times the expectation based on the MgII absorption systems seen towards normal quasars (QSOs). Given its serious implications, it becomes important to revisit this finding, by enlarging the blazar sample and subjecting it to an independent analysis. Here, we first report the outcome of our re-analysis of the available spectroscopic data for the BBM sample itself. Our analysis of the BBM sample reproduces their claimed factor of 2 excess of dN/dz along blazar sightlines, vis-a-vis normal QSOs. We have also assembled an approximately three times larger sample of blazars, albeit with moderately sensitive optical spectra. Using this sample together with the BBM sample, our analysis shows that the dN/dz of the MgII absorbers statistically matches that known for normal QSO sightlines. Further, the analysis indicates that associated absorbers might be contributing significantly to the estimated dN/dz up to offset speeds {DELTA}v~0.2c relative to the blazar.2018MNRAS.473.5154Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/473/5154CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)J/MNRAS/277/1477 : A catalogue of BL Lacertae objects (Padovani+ 1995)J/A+A/495/691 : Blazars multifrequency catalog, Roma-BZCAT (Massaro+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/473/5154https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/473/5154http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/473/5154https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/473/5154https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/473/5154http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/473/5154GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/473/5154/table2 (Basic properties of our 191 blazars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/473/5154/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/473/5154/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/473/5154/table2?GETtext/xml+votable180.050000true4.9041720.362780.0055555555555555566/60 579 1085 2140 4642 4770 4805 4824 5107 5139 5270 5284 5311 5361 5450 5510 5516 5529 5677 5836 5887 5960 5990 6021 6096 6132 6255 6386 6406 6507 6527 6568 6629 6636 7269 7478 8195 8321 8374 8487 8509 8521 8559 8955 9114 9196 9301 9318 9327 9445 9600 9618 9762 9823 9879 9950 9984 10389 10422 10572 10612 10669 10715 10780 10800 10843 10848 10852 10900 10910 11004 11143 11153 11176 11209 11253 11260 11290 11373 11385 11449 11460 11515 11522 11832 11876 11912 12475 15286 17150 17239 17401 17516 17755 17857 18070 18491 18604 18661 19056 19088 19110 19200 19411-19412 19890 19993 20006 20202 21121 21855 21879 21924 21960 23011 23121 24608 25864 26036 26056 26067 26073-26074 26256 26270 26308 26310 26483 26565 26595 26956 26983 26998 27003 27082 27198 27249 27251 27310 27389 27396 27523-27524 27554 27669 27675 28045 28199 28222 28290 28432 28542 28662 28664 29675 30012 31323 31424 31485 31656 32442 33880 34123 34317 34461 34572 35079 35199 35720 35786 35981 36005 36058 36342 36432 36728 36779 40479 40689 43366 43447 43765 44147 46204 46736 46787 47003 47057 47708 47943https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/473/5154?format=asciidefaultJ/MNRAS/473/5154/table2Basic properties of our 191 blazarsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEWrrest-frame equivalent width in table3meta.ref.urlcharBlazarBlazar name (JHHMMSS+DDMMSS)meta.id;meta.maincharprimaryn_z[*] Note on z (1)meta.notecharzEmission redshift (1)src.redshiftfloatSourceArchive name from where data has been aquiredmeta.idcharDeltazRedshift path for strong system analysis (2)src.redshift;pos.heliocentricfloatSNRSNR of the spectrum involved in the analysisstat.snrfloat_RAPosition from name (right ascension part)degpos.eq.ra;meta.main_DEPosition from name (declination part)degpos.eq.dec;meta.mainJ/MNRAS/473/5154/table3The detected 43 MgII absorption systems and their rest-frame equivalent widths, W_r_(MgII{lambda}2796{AA}), as identified in 35 blazars belonging to our 191 blazarszemEmission redshiftsrc.redshiftfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBlazarBlazar name (JHHMMSS+DDMMSS)meta.id;meta.maincharzabsAbsorption redshift of detected MgII systemsrc.redshiftdoubleWrEquivalent width of detected MgII system0.1nmspect.line.eqWidthfloatAbsAssociated metal absorption lines detected using the velocity plot w.r.t absorption redshift of MgII systemsmeta.notechar