J/AJ/160/37ivo://CDS.VizieR/J/AJ/160/37doi:10.26093/cds/vizier.51600037CDSMonzon J.S.Prochaska J.X.Lee K.-G.Chisholm J.2022-11-07T07:00:58Z2020-12-24T09:31:39ZCDS support team

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

cds-question@unistra.frgalaxiesstar-forming-regionsintergalactic-mediumstellar-atmospheric-opacityredshiftedvisible-astronomyspectroscopyWe measure the effective opacity ({tau}_eff_) of the intergalactic medium from the composite spectra of 281 Lyman-break galaxies in the redshift range 2<~z<~3. Our spectra are taken from the COSMOS Ly{alpha} Mapping And Tomographic Observations survey derived from the Low Resolution Imaging Spectrometer on the W.M. Keck I telescope. We generate composite spectra in two redshift intervals and fit them with spectral energy distribution (SED) models composed of simple stellar populations. Extrapolating these SED models into the Ly{alpha} forest, we measure the effective Ly{alpha} opacity ({tau}_eff_) in the 2.02<~z<~2.44 range. At z=2.22, we estimate {tau}_eff_=0.159{+/-}0.001 from a power-law fit to the data. These measurements are consistent with estimates from quasar analyses at z<2.5 indicating that the systematic errors associated with normalizing quasar continua are not substantial. We provide a Gaussian processes model of our results and previous {tau}_eff_ measurements that describes the steep redshift evolution in {tau}_eff_ from z=1.5-4.2020AJ....160...37Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/160/37CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/596/768 : Optical depths in 19 QSOs (Schaye+, 2003)J/ApJ/662/72 : Lyman alpha forest of 55 QSOs (Becker+, 2007)J/ApJS/172/70 : zCOSMOS-bright catalog (Lilly+, 2007)J/A+A/530/A50 : Principal Component Analysis of QSO UV spectra (Paris+,2011)J/MNRAS/445/1745 : Giant Gemini GMOS survey. I. (Worseck+, 2014)J/ApJ/828/21 : ZFIRE v1.0 data release (Nanayakkara+, 2016)J/ApJ/862/96 : Star-forming galaxies with LABOCA 870um obs. (Lewis+, 2018)J/ApJS/237/31 : CLAMATO DR1: 3D Ly{alpha} forest tomography (Lee+, 2018)J/A+A/633/A159 : Bright Lyman-alpha emitters in MUSE/COSMOS (Rosani+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/160/37https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/160/37http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/160/37https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/160/37https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/160/37http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/160/37GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/160/37/tablea1 (COSMOS Ly{alpha} Mapping And Tomographic Observations (CLAMATO) Lyman-break galaxies (LBGs) used in our composite analysis)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/160/37/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/160/37/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/160/37/tablea1?GETtext/xml+votable180.050000true150.088442.248470.0055555555555555566/27256 27258-27259https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/160/37?format=asciiOpticaldefaultJ/AJ/160/37/tablea1COSMOS Ly{alpha} Mapping And Tomographic Observations (CLAMATO) Lyman-break galaxies (LBGs) used in our composite analysisSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDCLAMATO identification of the galaxymeta.id;meta.maincharRAJ2000[149/151] Degree of right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[2.13/2.5] Degree of declination (J2000)degpos.eq.dec;meta.mainz[2.25/2.75] Redshiftsrc.redshiftfloatJ/AJ/160/37/tablea2Effective opacity values and corresponding 1D errors for the z_low_ and z_high_ redshift intervalrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintz[2.02/2.45] Redshiftsrc.redshiftfloattau[-0.004/0.38] Effective opacity ({tau}_eff_)phys.absorption.coefffloate_tau[0.03/0.1] Error on tau ({tau}_{sigma}_)stat.errorfloat