J/MNRAS/516/2947ivo://CDS.VizieR/J/MNRAS/516/2947doi:10.26093/cds/vizier/bg-g4-2w3CDSSu R.Sadler E.M.Allison J.R.Mahony E.K.Moss V.A.Whiting M.T.,Yoon H.Aditya J.N.H.S.Bellstedt S.Robotham A.S.G.,Garratt-smithson L.Gu M.Koribalski B.S.Soria R.Weng S.2026-08-03T07:31:52Z2025-10-07T14:07:38ZCDS support team

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

cds-question@unistra.frgalaxiesradio-sourcesradio-continuum-emissionactive-galactic-nucleih-i-line-emissionspectroscopyastrometryastronomical-object-identificationredshiftedvisible-astronomystellar-spectral-typesinfrared-photometrygalaxy-classification-systemsWe present the results of a search for associated 21 cm HI absorption at redshift 0.42 < z < 1.00 in radio-loud galaxies from three Galaxy And Mass Assembly (GAMA) survey fields. These observations were carried out as part of a pilot survey for the Australian SKA Pathfinder (ASKAP) First Large Absorption Survey in HI (FLASH). From a sample of 326 radio sources with 855.5 MHz peak flux density above 10 mJy, we detected two associated HI absorption systems, in SDSS J090331+010847 at z = 0.522 and SDSS J113622+004852 at z = 0.563. Both galaxies are massive (stellar mass > 10^11^ M_{Sun}_) and have optical spectra characteristic of luminous red galaxies, though spectral energy distribution fitting implies that SDSS J113622+004852 contains a dust-obscured starburst with star formation rate ~ 69 M_{Sun}_.yr^-1^. The HI absorption lines have a high optical depth, with {tau}_pk_ of 1.77 +/- 0.16 for SDSS J090331+010847 (the highest value for any z > 0.1 associated system found to date) and 0.14 +/- 0.01 for SDSS J113622+004852. In the redshift range probed by our ASKAP observations, the detection rate for associated HI absorption lines (with {tau}_pk_ > 0.1 and at least 3{sigma} significance) is 2.9^+9.7^_-2.6_ per cent. Although the current sample is small, this rate is consistent with a trend seen in other studies for a lower detection rate of associated 21 cm HI absorption systems at higher redshift. We also searched for OH absorption lines at 0.67 < z < 1.34, but no detection was made in the 145 radio sources searched.2022MNRAS.516.2947Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/516/2947CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/464/1306 : LARGESS survey (Ching+, 2017)J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)J/MNRAS/452/2087 : Galaxy And Mass Assembly (GAMA): DR2 (Liske+, 2015)J/MNRAS/452/217 : HI cosmological mass density at z=5 (Crighton+, 2015)J/MNRAS/440/696 : HI absorption in nearby radio galaxies (Allison+, 2014)J/MNRAS/476/875 : xGASS catalog (Catinella+, 2018)J/MNRAS/342/738 : HI Jodrell All Sky Survey (Lang+, 2003)J/MNRAS/435/650 : 325MHz GMRT survey of Herschel-ATLAS/GAMA fieldsJ/MNRAS/473/1879 : VVDS14h redshift catalog (Rhee+, 2018)J/MNRAS/474/3875 : Galaxy And Mass Assembly (GAMA): DR3 (Baldry+, 2018)J/A+A/547/L1 : SDSS-III DR9 DLA catalogue (Noterdaeme+, 2012)J/A+A/647/A63 : 4C52.37 and 3C 293 parsec-scale HI outflows (Schulz+, 2021)J/A+A/604/A43 : HI in nearby radio sources (Maccagni+, 2017)J/A+A/575/A44 : HI absorption in flux-selected radio AGNs (Gereb+, 2015)J/A+A/585/A41 : EBHIS spectra and HI column density maps (Winkel+, 2016)J/A+A/595/A118 : NIBLES. I. The Nancay HI survey (van Driel+, 2016)J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (Intema+, 2017)J/ApJS/255/28 : ~420MHz uGMRT obs. of MIR selected radio-loud AGNJ/ApJS/245/3 : HI 21cm and OH 18cm absorption search with the GBTJ/ApJS/238/14 : 21-SPONGE HI Absorption Line Survey. I. (Murray+, 2018)J/ApJS/97/347 : Source Catalog, PMN Equatorial Survey (Griffith+ 1995)J/AJ/151/74 : VLA/VLBA obscured radio-loud active galactic nucleiVIII/38 : The Parkes-MIT-NRAO 4.85GHz (PMN) SurveysVIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)VIII/100 : GaLactic and Extragalactic All-sky MWA surveyVIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)II/335 : Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7)II/328 : AllWISE Data Release (Cutri+ 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/516/2947https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/516/2947http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/516/2947https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/516/2947https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/516/2947http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/516/2947GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/516/2947/table4 (326 Radio sources in 0.42 < z < 1.0 with optical counterparts and S855.5 => 10mJy in GAMA fields)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/516/2947/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/516/2947/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/516/2947/table4?GETtext/xml+votable180.050000true9.1745832.4938920.005555555555555556Cone search capability for table J/MNRAS/516/2947/table5 (Physical and observational properties of our selected 326 radio sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/516/2947/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/516/2947/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/516/2947/table5?GETtext/xml+votable180.050000true128.80929170.27075280.005555555555555556Cone search capability for table J/MNRAS/516/2947/tablea1 (*73 extended radio sources in 0.42 < z < 1.0 and S855.5 => 10mJy that were excluded)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/516/2947/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/516/2947/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/516/2947/tablea1?GETtext/xml+votable180.050000true128.8975-0.1283440.0055555555555555564/1130 5/1026 4493 4495 4506-4507 4514-4515 4517 4519 4524 4526 4528-4530 4865 5463 5469 6398 6483 6487-6489 6491 6501 6568 6570 6827 6830 6/4096-4097 4099-4100 4102-4103 4109 4112-4114 4116 8202 8225-8226 17397 17399 17407 17951 17971 17977-17979 17994 18017-18019 18022 18042 18051 18053-18055 18065-18067 18072-18074 18101-18103 18108-18109 18124 18126 18128 18130 18144-18146 19457 19459 19469 19472-19473 19476 21829 21836-21837 21839 21842-21844 21846-21850 21861 21875 21884 21886 25567 25581 25591 25596 25598-25599 25909 25911 25914-25915 25917-25919 25925-25926 25930-25931 25936-25938 25940 25942-25943 25946-25947 25960 25963 25969-25974 25976-25977 25979-25980 26001 26003 26012-26013 26015 26048-26049 26051-26053 26055 26058-26061 26064-26066 26081 26243 26246 26248-26250 26252 26254 26266 26278-26279 26285 26287-26288 26290-26291 26294 26296 26298 26949-26951 26956-26957 26959-26962 26964 26966 26969-26971 26973-26975 26992-26993 26995-26996 27270 27273-27274 27277-27279 27290 27297 27299 27301-27303 27305 27307 27314-27315 27649-27650 27654 27657-27658 40949 40957-40959 45051https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/516/2947?format=asciiOpticalInfraredRadiodefaultJ/MNRAS/516/2947/table4326 Radio sources in 0.42 < z < 1.0 with optical counterparts and S855.5 => 10mJy in GAMA fieldsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIsland identifier designation (Island_ID) (1)meta.id.part;meta.maincharRAISRight ascension of the island (J2000)pos.eq.raDEISDeclination of the island (J2000)pos.eq.decCompIDComponent designation within each island (Comp_ID)meta.id.part;meta.maincharRAJ2000Right ascension of the component (J2000)pos.eq.ra;meta.mainDEJ2000Declination of the component (J2000)pos.eq.dec;meta.mainS855.5Peak flux density at 855.5 MHz from ASKAP observations of GAMA fields (Peak_flux_density)mJy/beamphot.flux.density;em.radio.750-1500MHz;obsfloatzOptical redshift of the host galaxy of each radio source (Redshift)src.redshiftfloatr_zLiterature reference of z (Redshift_origin) (2)meta.ref;pos.framecharSepAngular separation between island coordinates and optical coordinates (Separation)arcsecpos.angDistancefloatSDSSSDSS designation name from photometric catalogue DR12 (SDSS_ID)meta.id.parentcharFlag[yes/no ] Indicates if the optical source is in LARGESS Ching's catalog, yes for 329 sources and no for 74 sources (In_ching2017)meta.code.errorcharJ/MNRAS/516/2947/table5Physical and observational properties of our selected 326 radio sourcesDLDistance luminosity (D)Mpcpos.distance;arithfloattau? Peak optical depth of the H I absorption line as in equation 2 of section 5.3.1 ({tau}_pk_)phys.absorption.opticalDepth;meta.modelled;arithfloatnullableE_tau? Upper error of taustat.error;stat.maxfloatnullablee_tau? Lower error of taustat.errorfloatnullablel_log(NHI)Upper limit flag of the estimated H I column density log(N_HI_) for non detections in HImeta.code.errorcharlog(NHI)? Logarithm of HI column density (log10N_HI_) (5)log(cm**-2)phys.columnDensity;meta.modelled;arithfloatnullableE_log(NHI)? Upper error of log (NHI)log(cm**-2)stat.error;stat.maxfloatnullablee_log(NHI)? Lower error of log (NHI)log(cm**-2)stat.errorfloatnullable_RAOptical position from SDSS-DR12 names (right ascension part)degpos.eq.ra;meta.main_DEOptical position from SDSS-DR12 names (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS designation name from optical photometric catalogue DR12 (SDSS_ID)meta.id;meta.maincharSDSS-DR12Display SDSS DR12 from Alam et al. 2015ApJS..219...12A, Cat. V/147meta.ref.urlcharSpectDisplay the online SDSS-DR12 data for the nearest objectmeta.ref.urlcharzOptical redshift of the host galaxy of each radio source (Redshift)src.redshiftdoubleFNVSSNVSS integrated flux density (S_NVSS_)mJyphot.flux.density;em.radio.750-1500MHzfloatFASKAPASKAP integrated flux density (S_ASKAP_)mJyphot.flux.density;em.radio.750-1500MHz;obsfloatlog(L1.4GHz)Rest-frame radio power at 1.4GHz from with FASKAP (log10L1.4GHz)log(W.Hz**-1)phys.luminosity;em.radio.750-1500MHz;obsfloatalphaSpectral index at 855.5-1400MHz calculated from the NVSS and ASKAP flux densitiesspect.index;em.radio.750-1500MHz;obsfloatW1mag? W1 apparent magnitude from allWISE of Cat. II/328 (W1)magphot.mag;em.IR.3-4umfloatnullablee_W1mag? Mean uncertainty of W1mag (errW1)magstat.error;phot.magfloatnullableW2mag? W2 apparent magnitude from allWISE Cat. II/328 (W2)magphot.mag;em.IR.4-8umfloatnullablee_W2mag? Mean uncertainty of W2mag (errW2)magstat.error;phot.magfloatnullablel_W3magLower limit flag of W3magmeta.code.errorcharW3mag? W3 apparent magnitude from allWISE of Cat. II/328 (W3)magphot.flux.density;em.IR.8-15umfloatnullablee_W3mag? Mean uncertainty of W3mag (errW3)magstat.error;phot.magfloatnullablelog(QHI)Ionizing photon rate (log10Q_HI_)log(s**-1)phot.count;em.UV;meta.modelledfloatTypeActivity type reported by Ching et al. 2017MNRAS.464.1306C, Cat. J/MNRAS/464/1306 (Type) (1)src.classcharMorphRadio morphology classification based on our visual inspection of FIRST images (Structure) (2)meta.code.classcharFieldGAMA observation fields (Field) (3)obs.fieldcharSBIDIndicates the SBID from which we extracted each spectrum (SBID) (4)obs.fieldintRMSRMS spectral noise in a single 18.5 kHz ASKAP channel (in mJy/channel) (rms)mJystat.stdevfloatl_tauUpper limit flag of tau for 3{sigma} limit based on RMS spectral noise values in assignedmeta.code.errorcharJ/MNRAS/516/2947/tablea1*73 extended radio sources in 0.42 < z < 1.0 and S855.5 => 10mJy that were excludedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIsland identifier designation (Island_ID) (1)meta.id.part;meta.maincharRAISRight ascension of the island (J2000)pos.eq.raDEISDeclination of the island (J2000)pos.eq.decCompIDComponent designation within each island (Comp_ID)meta.id.part;meta.maincharRAJ2000Right ascension of the component (J2000)pos.eq.ra;meta.mainDEJ2000Declination of the component (J2000)pos.eq.dec;meta.mainS855.5Peak flux density at 855.5 MHz from ASKAP observations of GAMA fields (Peak_flux_density)mJy/beamphot.flux.density;em.radio.750-1500MHz;obsfloatSDSSSDSS designation name from photometric catalogue DR12 (SDSS_ID)meta.id.parentcharzOptical redshift of the host galaxy of each radio source (Redshift)src.redshiftfloatr_zLiterature reference of z (Redshift_origin) (2)meta.ref;pos.framecharFlag[yes/no ] Indicates if the optical source is in LARGESS Ching's catalog, yes for 105 sources and no for 38 sources (In_ching2017)meta.code.errorcharSepAngular separation between island coordinates and optical coordinates (Separation)arcsecpos.angDistancefloat