J/ApJ/736/48ivo://CDS.VizieR/J/ApJ/736/48doi:10.26093/cds/vizier.17360048CDSRafelski M.Wolfe A.M.Chen H.-W.2017-10-12T13:00:30Z2013-01-23T08:48:06ZCDS support team

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

cds-question@unistra.frgalaxiesphotometryredshiftedvisible-astronomybroad-band-photometryWe present evidence for spatially extended low surface brightness emission around Lyman break galaxies (LBGs) in the V-band image of the Hubble Ultra Deep Field, corresponding to the z~3 rest-frame far-UV (FUV) light, which is a sensitive measure of star formation rates (SFRs). We find that the covering fraction of molecular gas at z~3 is not adequate to explain the emission in the outskirts of LBGs, while the covering fraction of neutral atomic-dominated hydrogen gas at high redshift is sufficient. We develop a theoretical framework to connect this emission around LBGs to the expected emission from neutral HI gas, i.e., damped Ly{alpha} systems (DLAs), using the Kennicutt-Schmidt (KS) relation. Working under the hypothesis that the observed FUV emission in the outskirts of LBGs is from in situ star formation in atomic-dominated hydrogen gas, the results suggest that the SFR efficiency in such gas at z~3 is between factors of 10 and 50 lower than predictions based on the local KS relation. The total SFR density in atomic-dominated gas at z~3 is constrained to be ~10% of that observed from the inner regions of LBGs. In addition, the metals produced by in situ star formation in the outskirts of LBGs yield metallicities comparable to those of DLAs, which is a possible solution to the "Missing Metals" problem for DLAs. Finally, the atomic-dominated gas in the outskirts of galaxies at both high and low redshifts has similar reduced SFR efficiencies and is consistent with the same power law.2011ApJ...736...48Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/736/48CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)II/258 : Hubble Ultra Deep Field Catalog (UDF) (STScI, 2004)J/ApJ/735/L22 : HUDF galaxy properties at z~2 (Szomoru+, 2011)J/ApJ/703/2033 : Lyman-break galaxies (LBG) in the HUDF (Rafelski+, 2009)J/AJ/132/1729 : Hubble Ultra Deep Field BVI-dropout sources (Beckwith+, 2006)J/AJ/132/1023 : U-band dropouts in Hubble Ultra Deep Field (Wadadekar+, 2006)J/AJ/132/926 : Galaxies in the Hubble Ultra Deep Field (Coe+, 2006)J/AJ/130/1 : Catalog of source parameters in NICMOS UDF (Thompson+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/736/48https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/736/48http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/736/48https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/736/48https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/736/48http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/736/48GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/736/48/table1 (Properties of Lyman-Break Galaxies (LBGs) included in image stack)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/736/48/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/736/48/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/736/48/table1?GETtext/xml+votable180.050000true53.15764222-27.824977780.0055555555555555566/35935https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/736/48?format=asciiOpticaldefaultJ/ApJ/736/48/table1Properties of Lyman-Break Galaxies (LBGs) included in image stackrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[CBS2006][84/60302] Corresponds to Coe et al. catalog (1)meta.id;meta.mainintzb[2.5/3.5] Bayesian Photometric-Z most likely redshiftsrc.redshift.photfloate_zbLower limit (95% confidence)stat.errorfloatE_zbUpper limit (95% confidence)stat.error;stat.maxfloatVmag[25.0/27.6] HST V band AB magnitudemagphot.mag;em.opt.Vfloate_VmagUncertainty in Vmagmagstat.error;phot.mag;em.opt.Vfloatu'-VThe (u'-V) color indexmagphot.color;em.opt;em.optfloate_u'-VUncertainty in u'-Vmagstat.errorfloatB-VThe (B-V) color indexmagphot.color;em.opt.B;em.opt.Vfloate_B-VUncertainty in B-Vmagstat.error;phot.color;em.opt.BfloatV-z'The (V-z') color indexmagphot.color;em.opt;em.optfloate_V-z'Uncertainty in V-z'magstat.errorfloatFWHM[0.1/0.24] FWHM of LBG as measured by SExtractorarcsecphys.angSizefloatEll[0.01/0.25] Ellipticity of LBG as measured by SExtractorsrc.ellipticityfloatUDFCross-match within 0.5" with other UDF catalogs (J/AJ/132/926, J/AJ/132/1729, J/ApJ/703/2033 and J/AJ/130/1)meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.refcharNEDSimbad column added by the CDSmeta.refchar_RAPositions from Coe et al. 2006, Cat. J/AJ/132/926 (right ascension part)degpos.eq.ra;meta.main_DEPositions from Coe et al. 2006, Cat. J/AJ/132/926 (declination part)degpos.eq.dec;meta.main