J/A+A/679/A30ivo://CDS.VizieR/J/A+A/679/A30doi:10.26093/cds/vizier.36790030CDSFynbo J.P.U.Christensen L.B.Geier S.J.Heintz K.E.Krogager J.-K.,Ledoux C.Milvang-Jensen B.Moller P.Vejlgaard S.Viuho J.Ostlin G.2024-11-28T20:05:43Z2023-11-01T09:01:53ZCDS support team

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

cds-question@unistra.frquasarsgalaxiesWe report on further observations of the field of the quasar Q1218+0832. Geier et al. (2019A&A...625L...9G) presented the discovery of the quasar resulting from a search for quasars reddened and dimmed by dust in foreground Damped Lyman-alpha Absorbers (DLAs). The DLA is remarkable by having a very large HI column density close to 10^22^cm^-2^. Its dust extinction curve shows the 2175{AA}-bump known from the Local Group. It also shows absorption from cold gas exemplified by CI and CO-molecules. We here present narrow-band observations of the field of Q1218+0832 and also use archival HST image to search for the galaxy counterpart of the DLA. No emission from the DLA galaxy is found neither in the narrow-band imaging nor in the HST image. In the HST image, we can probe down to an impact parameter of 0.3arcsec and a 3-sigma detection limit of 26.8 mag per arcsec^2^. In the narrow-band image, we probe down to 0 arcsec impact parameter and detect nothing down to a 3-sigma detection limit of about 3*10^-17^erg/s/cm^2^. We do detect a bright Lyman-alpha emitter 59arcsec south of Q1218+0832 with a flux of 3*10^-16^erg/s/cm^2^. We conclude that the DLA galaxy must be located at very small impact parameter (<0.3arcsec, 2.5kpc) or is optically dark. Also, the DLA galaxy most likely is part of a galaxy group.2023A&A...679A..30Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/679/A30CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/679/A30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/679/A30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/679/A30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/679/A30https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/679/A30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/679/A30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/679/A30/gtcspecReduced GTC spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength (vacuum)0.1nmem.wldoubleFluxFlux (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1phot.fluxdoublee_FluxFlux error (in erg/s/cm^2^/{AA})10mW.m**-2.nm**-1stat.error;phot.fluxdouble