J/A+A/631/A78ivo://CDS.VizieR/J/A+A/631/A78doi:10.26093/cds/vizier.36310078CDSStanley F.Jolly J.B.Koenig S.Knudsen K.K.2019-10-23T06:22:36Z2019-10-23T07:20:25ZCDS support team

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

cds-question@unistra.frquasarsspectroscopyOutflows in quasars during the early epochs of galaxy evolution are an important part of the feedback mechanisms potentially affecting the evolution of the host galaxy. However, systematic observations of outflows are only now becoming possible with the advent of sensitive mm telescopes. In this study we use spectral stacking methods to search for faint high velocity outflow signal in a sample of [CII] detected, z~6 quasars. We search for broad emission line signatures from high-velocity outflows for a sample of 26 z~6 quasars observed with ALMA, with a detection of the [CII] line. The observed emission lines of the sources are dominated by the host galaxy, and outflow emission is not detected for the individual sources. We use a spectral line stacking analysis developed for interferometric data to search for outflow emission. We stack both extracted spectra and the full spectral cubes. We also investigate the possibility that only a sub-set of our sample contributes to the stacked outflow emission. We find only a tentative detection of a broad emission line component in the stacked spectra. When taking a region of about 2 arcsec around the source central position of the stacked cubes, the stacked line shows an excess emission due to a broad component of 1.1-1.5 sigma, but the significance drops to 0.4-0.7 sigma when stacking the extracted spectra from a smaller region. The broad component can be characterised by a line width of full width half max FWHM > 700 km/s. Furthermore, we find a sub-sample of 12 sources the stack of which maximises the broad component emission. The stack of this sub-sample shows an excess emission due to a broad component of 1.2-2.5 sigma. The stacked line of these sources has a broad component of FWHM>775km/s. Deeper ALMA observations are necessary to confirm the presence of a broad component in the individual spectra.2019A&A...631A..78Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/631/A78CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/631/A78https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/631/A78http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/631/A78https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/631/A78https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/631/A78http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/631/A78GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/631/A78/sources (List of studied sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/631/A78/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/631/A78/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/631/A78/sources?GETtext/xml+votable180.050000true7.02733334.95713890.005555555555555556Cone search capability for table J/A+A/631/A78/list (List of fits datcubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/631/A78/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/631/A78/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/631/A78/list?GETtext/xml+votable180.050000true22.49378-0.594370.0055555555555555566/16554 17236 17358 17407 17663 18155 19036 20116 25330 26239 26524 26869 26973 27022 27041 27676 30036 34187 34762 35615 36182 44429 44463 46589 46983 48715 48899https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/631/A78?format=asciidefaultJ/A+A/631/A78/sourcesList of studied sourcesSNameSimbad namemeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainFileNameName of the fits datacube in subdirectory fitsmeta.id;meta.fitscharJ/A+A/631/A78/listList of fits datcubesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of slicesmeta.numberintObs.dateObservation datestime.epoch;obsnullablebVRADLower value of VRAD intervalm/sphys.velocdoubleBVRADUpper value of VRAD intervalm/sphys.velocdoubledVRADVRAD resolutionm/sspect.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits