J/MNRAS/465/997ivo://CDS.VizieR/J/MNRAS/465/997doi:10.26093/cds/vizier.74650997CDSChandola Y.Saikia D.J.2024-08-17T20:17:29Z2018-09-07T12:14:57ZCDS support team

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

cds-question@unistra.fractive-galactic-nucleispectroscopyinfrared-photometryHI absorption studies of active galaxies enable us to probe their circumnuclear regions and the general interstellar medium and study the supply of gas that may trigger nuclear activity. In this article, we investigate the dependence of the detection rate of HI absorption on the nature of radio galaxies based on their emission-line spectra and on the nature of host galaxies based on WISE colours and their radio structure, which may help us understand the different accretion modes. We find significant differences in the distributions of W2-W3 colour for sources with HI absorption detections and non-detections. We report a high detection rate of HI absorption in those galaxies with WISE infrared colours W2-W3>2, typical of gas-rich systems, along with a compact radio structure. The HI detection rate for low-excitation radio galaxies (LERGs) with W2-W3>2 and compact radio structure is high (70.6+/-20.4 per cent). In high-excitation radio galaxies (HERGs), compact radio structure in the nuclear or circumnuclear region could give rise to absorption by gas in the dusty torus, in addition to gas in the interstellar medium. However, the higher specific star-formation rate (sSFR) for LERGs with W2-W3>2 suggests that HI absorption may be largely due to star-forming gas in their hosts. LERGs with extended radio structure tend to have significantly lower values of W2-W3 compared with those with compact structure. Extended radio sources and those with W2-W3<2 have low HI detection rates.2017MNRAS.465..997Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/465/997CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/328 : AllWISE Data Release (Cutri+ 2013)J/A+A/575/A44 : HI absorption in flux-selected radio AGNs (Gereb+, 2015)J/MNRAS/421/1569 : Properties of 18286 SDSS radio galaxies (Best+, 2012)http://wwwmpa.mpa-garching.mpg.de/SDSS/DR7 : SDSS DR7 Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/465/997https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/465/997http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/465/997https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/465/997https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/465/997http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/465/997GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/465/997/sample (Optical line characteristics of sources (D, table A1) and not detected (N, table A2) in HI absorption by Gereb et al., 2015, Cat. J/A+A/575/A44)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/465/997/sample?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/465/997/sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/465/997/sample?GETtext/xml+votable180.050000true119.4862539.9933330.0055555555555555566/4429 4521 4705 4731 4758 4807 4861 4918 4927 5005 5225 5583 5618 5642 5680 5800 5889 5930 6212 6261 6436 6515 6519 6526 6532 6534-6535 6620 7192 7196 7265 7285 7301 7351 7552 8414 8514 8521 8526 8576 8658-8659 8850 8900 9009 9049 9060 9075 9078 9200 9351 9357 9376 9387 9764 9771 9839 9855 9981 10027 10120 10355 10402 10465 10491 10579 10682 10748-10749 10784 10835 10865 10868 10877 10941 10959 10975 11001 11136 11242 11398 11426 11512 11792 11908 27894 28003 28005 28036 28075 28249 28270 28298 28307 28339 28407 28415 28517 28643https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/465/997?format=asciiInfrareddefaultJ/MNRAS/465/997/sampleOptical line characteristics of sources (D, table A1) and not detected (N, table A2) in HI absorption by Gereb et al., 2015, Cat. J/A+A/575/A44RClassRadio Structural class (4)meta.code.classcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSampDetected or Not detected by Gereb et al., 2015, Cat. J/A+A/575/A44meta.codecharSeq[1/100] Sequence numbermeta.id;meta.mainintRAJ2000Right ascension (J2000.0) (1)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0) (1)pos.eq.dec;meta.mainFHbH{beta} flux (2)1e-20W.m**-2phot.flux;em.line.Hbetafloate_FHbH{beta} flux error1e-20W.m**-2stat.errorfloatFO[III]O[III] flux (2)1e-20W.m**-2phot.fluxdoublee_FO[III]O[III] flux error (2)(5)1e-20W.m**-2stat.errorfloatEWO[III]O[III] equivalent width (2)0.1nmspect.line.eqWidthfloate_EWO[III]O[III] equivalent width error0.1nmstat.errorfloatFO[I]O[I] flux (2)(6)1e-20W.m**-2phot.fluxfloate_FO[I]O[I] flux error (2)(5)1e-20W.m**-2stat.errorfloatFHaH{alpha} flux (2)1e-20W.m**-2phot.flux;em.line.Halphadoublee_FHaH{alpha} flux error (2)(5)1e-20W.m**-2stat.errorfloatFN[II]N[II] flux (2)1e-20W.m**-2phot.fluxdoublee_FN[II]N[II] flux error (2)(5)1e-20W.m**-2stat.errorfloatFS[II]S[II] flux (2)(6)1e-20W.m**-2phot.fluxdoublee_FS[II]S[II] flux error (2)(5)1e-20W.m**-2stat.errordoubleOClassOptical class (3)meta.code.classcharJ/MNRAS/465/997/tablea3WISE magnitudes, stellar masses (SM), star formation rates (SFR) and specific star formation rates (sSFR) for all 100 sourcesSeq[1/100] Sequence numbermeta.id;meta.mainintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWISESource name in WISE catalog (1)meta.idcharW1magMagnitude at W1(3.4 micron), Vega (2)magphot.mag;em.IR.3-4umfloate_W1magError in magnitude at W1, Vega (2)(6)magstat.error;phot.magfloatW2magMagnitude at W2(4.6 micron), Vega (2)magphot.mag;em.IR.4-8umfloate_W2magError in magnitude at W2, Vega (2)(6)magstat.error;phot.magfloatl_W3magUpper limit flag on W3magmeta.code.errorcharW3magMagnitude at W3(12 micron), Vega (2)magphot.flux.density;em.IR.8-15umfloate_W3mag? Error in magnitude at W3, Vega (2)(6)magstat.error;phot.magfloatnullablel_W4magUpper limit flag on W4magmeta.code.errorcharW4magMagnitude at W4(22 micron), Vega (2)magphot.flux.density;em.IR.15-30umfloate_W4mag? Error in magnitude at W4, Vega (2)(6)magstat.error;phot.magfloatnullableLogSMLog Stellar mass (3)log(solMass)phys.massfloatLogSFRLog star formation rate (4)log(solMass.yr**-1)meta.idfloatLogsSFRLog specific star formation rate (5)log(yr**-1)phys.SFRfloat