J/MNRAS/441/1802ivo://CDS.VizieR/J/MNRAS/441/1802doi:10.26093/cds/vizier.74411802CDSKarhunen K.Kotilainen J.K.Falomo R.Bettoni D.2024-08-09T20:14:53Z2015-05-22T08:14:16ZCDS support team

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

cds-question@unistra.frquasarsactive-galactic-nucleiredshiftedapparent-magnitudeWe study the environments of low-redshift (z<0.5) quasars based on a large and homogeneous data set from the Stripe 82 region of the Sloan Digital Sky Survey (SDSS). We have compared the <1Mpc scale environments of 302 quasars that were resolved in our recent study to those of 288 inactive galaxies with closely matched redshifts. Crucially, the luminosities of the inactive galaxies and the quasar host galaxies are also closely matched, unlike in most previous studies. The environmental overdensities were studied by measuring the number density of galaxies within a projected distance of 200kpc to 1Mpc. The galaxy number density of the quasar environments is comparable to that of the inactive galaxies with similar luminosities, both classes of objects showing significant excess compared to the background galaxy density for distances <400kpc. There is no significant dependence of the galaxy number density on redshift, quasar or host galaxy luminosity, black hole mass or radio loudness. This suggests that the fuelling and triggering of the nuclear activity is only weakly dependent on the local environment of quasars, and the quasar phase may be a short-lived common phase in the life cycle of all massive galaxies.2014MNRAS.441.1802Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/441/1802CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)J/MNRAS/440/476 : Low-redshift quasars in SDSS Stripe 82 (Falomo+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/441/1802https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/441/1802http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/441/1802https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/441/1802https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/441/1802http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/441/1802GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/441/1802/table1 (Table of all quasars in the full quasar sample (FQS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/441/1802/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/441/1802/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/441/1802/table1?GETtext/xml+votable180.050000true309.23866670.02897220.005555555555555556Cone search capability for table J/MNRAS/441/1802/table2 (Table of all galaxies in the full control galaxy sample (FCGS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/441/1802/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/441/1802/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/441/1802/table2?GETtext/xml+votable180.050000true0.3394167-0.19452780.0055555555555555565/4437-4438 4442 4453-4454 4457 4501-4502 4505-4506 4517-4518 4521-4522 4693-4694 4697-4698 4710 4714 4758 4774 5786 5797-5798 5801-5802 7509-7510 6/0 2 12288 12290 17406-17407 17663 17725 17727 17741 17746-17747 17756-17757 17761-17764 17766-17767 17772 17774 17776 17778 17805 17807 17809-17811 17820-17821 17826-17827 17832 17834-17836 17838 17840-17842 17856 17858 17983 17997-17999 18002-18003 18012 18014 18018-18019 18028-18030 18032-18034 18061 18063 18067 18076 18082-18083 18092-18094 18096 18112 18114 18176 18178 18686-18687 18751 18765 18767 18769-18771 18780-18782 18786-18787 18796 18798 18800-18801 18829 18831 18833 18835-18838 18844-18845 18850-18853 18855 18860-18862 18864-18865 18880 18882 19005 19007 19021 19023 19026-19029 19031 19036-19038 19041 19043 19045-19048 19050-19053 19056 19091 19093 19100 19105 19107 19109-19111 19113-19114 19116 19120-19122 19136 19200 19456-19457 23101-23103 23150 23181 23183 23185 23187 23196 23198 23201 23203 23212-23214 23216-23218 23232-23233 30031 30035 30044 30046 30053 30064 36861-36863 49149 49151https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/441/1802?format=asciiOpticaldefaultJ/MNRAS/441/1802/table1Table of all quasars in the full quasar sample (FQS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqObject sequential number, within the table (1)meta.recordintNameName of object (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharz[0.5/0.5] Redshiftsrc.redshiftfloatN0.25[0/98] Number of galaxies detected within 0.25Mpcmeta.numberintn0.25[0/25] Galaxy density within 0.25Mpcarcmin**-2phys.densityfloatnbg[1/9.5] Average background galaxy densityarcmin**-2phys.densityfloate_nbgrms uncertainty on nbgarcmin**-2stat.errorfloatithr[20.7/23.3] Apparent i-band magnitude threshold determined for the framemagphot.magfloatNotesSample(s) the source belongs to (2)meta.notecharDR7QSODisplay SDSS-DR7 quasar catalog (Schneider et al., 1990, Cat. VII/260) datameta.ref.urlcharSloanDisplay the SDSS data for this quasarmeta.ref.urlchar_RAPositions from Name (right ascension part)degpos.eq.ra;meta.main_DEPositions from Name (declination part)degpos.eq.dec;meta.mainJ/MNRAS/441/1802/table2Table of all galaxies in the full control galaxy sample (FCGS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqObject sequential number, within the table (1)meta.recordintNameName of object (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharz[0.5/0.5] Redshiftsrc.redshiftfloatN0.25[0/98] Number of galaxies detected within 0.25Mpcmeta.numberintn0.25[0/25] Galaxy density within 0.25Mpcarcmin**-2phys.densityfloatnbg[1/9.5] Average background galaxy densityarcmin**-2phys.densityfloate_nbgrms uncertainty on nbgarcmin**-2stat.errorfloatithr[20.7/23.3] Apparent i-band magnitude threshold determined for the framemagphot.magfloatNotesSample(s) the source belongs to (2)meta.notecharSloanDisplay the SDSS data for this galaxymeta.ref.urlchar_RAPositions from Name (right ascension part)degpos.eq.ra;meta.main_DEPositions from Name (declination part)degpos.eq.dec;meta.main