J/MNRAS/491/2057ivo://CDS.VizieR/J/MNRAS/491/2057doi:10.26093/cds/vizier.74912057CDSLofthouse E.K.Fumagalli M.Fossati M.O'Meara J.M.Murphy M.T.,Christensen L.Prochaska J.X.Cantalupo S.Bielby R.M.Cooke R.J.,Lusso E.Morris S.L.2024-08-20T20:14:30Z2023-04-13T14:39:52ZCDS support team

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

cds-question@unistra.frgalaxiesspectroscopyquasarsredshiftedultraviolet-astronomyvisible-astronomyWe present the design, methods, and first results of the MUSE Analysis of Gas around Galaxies (MAGG) survey, a large programme on the Multi-Unit Spectroscopic Explorer (MUSE) instrument at the Very Large Telescope (VLT), which targets 28z>3.2 quasars to investigate the connection between optically thick gas and galaxies at z~3-4. MAGG maps the environment of 52 strong absorption line systems at z>~3, providing the first statistical sample of galaxies associated with gas-rich structures in the early Universe. In this paper, we study the galaxy population around a very metal poor gas cloud at z~3.53 towards the quasar J124957.23-015928.8. We detect three Ly{alpha} emitters within ~<200km/s of the cloud redshift, at projected separations ~<185kpc (physical). The presence of star-forming galaxies near a very metal-poor cloud indicates that metal enrichment is still spatially inhomogeneous at this redshift. Based on its very low metallicity and the presence of nearby galaxies, we propose that the most likely scenario for this Lyman Limit System (LLS) is that it lies within a filament which may be accreting on to a nearby galaxy. Taken together with the small number of other LLSs studied with MUSE, the observations to date show a range of different environments near strong absorption systems. The full MAGG survey will significantly expand this sample and enable a statistical analysis of the link between gas and galaxies to pin down the origin of these diverse environments at z~3-4.2020MNRAS.491.2057Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/491/2057CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/491/2057https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/491/2057http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/491/2057https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/491/2057https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/491/2057http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/491/2057GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/491/2057/table2 (Summary of the archival quasar spectroscopy used in this survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/2057/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/2057/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/2057/table2?GETtext/xml+votable180.050000true16.58016330.80649140.005555555555555556Cone search capability for table J/MNRAS/491/2057/table3 (Continuum sources in the MUSE FOV extracted by Sextractor with S/N>2 and m_r_<27mag)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/2057/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/2057/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/2057/table3?GETtext/xml+votable180.050000true192.48148-1.99934690.005555555555555556Cone search capability for table J/MNRAS/491/2057/table4 (Line emitters extracted within 1000km/s of the LLS at z~3.525)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/2057/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/2057/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/2057/table4?GETtext/xml+votable180.050000true192.4850375-1.998663890.0055555555555555566/8912 16417 17317 17735 17805 17895 18007 18032 18200 18466 18521 20016 23099 25413 26167 26369 26882 27083 27341 27549 27578 27845 29795 31313 35241 36320 47941 48166https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/491/2057?format=asciiUVOpticaldefaultJ/MNRAS/491/2057/table2Summary of the archival quasar spectroscopy used in this surveySimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameQuasar name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharInstInstrument namemeta.id;instrcharResolSpectral resolution (range is used if dependent on instrument arm)spect.resolutioncharlambdaminWavelength range covered by the spectrum (minimum value)0.1nminstr.bandwidthintlambdamaxWavelength range covered by the spectrum (maximum value)0.1nminstr.bandwidthintS/NblueS/N per pixel representative of the Ly{alpha} forest, away from saturated absorption linesstat.snrintlambdablueActual wavelength associated to S/Nblue0.1nmmeta.id.assoc;em.wlintS/Nred? S/N per pixel representative of the continuum redward to the quasar Ly{alpha}stat.snrintnullablelambdared? Actual wavelength associated to S/Nred0.1nmmeta.id.assoc;em.wlintnullablevdispNominal pixel velocity dispersion of the 1D spectra (range is used if arm dependent)km/sphys.veloc.dispersion;instr.pixelchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/491/2057/table3Continuum sources in the MUSE FOV extracted by Sextractor with S/N>2 and m_r_<27magSimbadSimbad column added by the CDSmeta.ref.urlcharID[1/105] Internal object identifiermeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameMUSE name (MUSEJHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainrmag? r-band magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag? Error on rmagmagstat.error;phot.magfloatnullablez? Redshift obtained using MARZsrc.redshiftdoublenullableq_z[1/6] Redshift confidence (1)meta.code.qual;src.redshiftintJ/MNRAS/491/2057/table4Line emitters extracted within 1000km/s of the LLS at z~3.525SimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[1/6] Inernal object identifiermeta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainFlineLine flux1e-21W.m**-2phot.flux;spect.linefloate_FlineError on Fline1e-21W.m**-2stat.errorfloatLlineLine luminosity1e+34Wphys.luminosityfloate_LlineError on Lline1e+34Wstat.errorfloatISNIntegrated S/N of the sourcestat.snrfloatClass[1/2] Confidence class based on ISN (1)meta.code.qualintzRedshiftsrc.redshiftdoublevoffVelocity offset relative to the central component of the LLSkm/sphys.veloc;arith.diffint