J/ApJ/814/40ivo://CDS.VizieR/J/ApJ/814/40doi:10.26093/cds/vizier.18140040CDSWakker B.P.Hernandez A.K.French D.M.Kim T.-S.Oppenheimer B.D.,Savage B.D.2017-09-05T14:39:29Z2016-03-23T13:44:47ZCDS support team

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

cds-question@unistra.frgalaxiesredshiftedspectroscopyultraviolet-astronomySimulations of the formation of large-scale structures predict that dark matter, low density highly ionized gas, and galaxies form 10 to 40Mpc scale filaments. These structures are easily recognized in the distribution of galaxies. Here we use Ly{alpha} absorption lines to study the gas in 30x6Mpc filament at cz~3500km/s, defined using a new catalog of nearby (cz<10000km/s) galaxies, which is complete down to a luminosity of about 0.05L_*_ for the region of space analyzed here. Using Hubble Space Telescope spectra of 24 active galactic nuclei, we sample the gas in this filament. All of our sightlines pass outside the virial radius of any known filament galaxy. Within 500kpc of the filament axis the detection rate is ~80%, but no detections are seen more than 2.1Mpc from the filament axis. The width of the Ly{alpha} lines correlates with filament impact parameter and the four BLAs in our sample occur within 400kpc of the filament axis, indicating increased temperature and/or turbulence. Comparing to simulations, we find that the recent Haardt & Madau extragalactic ionizing background predicts a factor of 3-5 too few ionizing photons. Using a more intense radiation field matches the hydrogen density profile within 2.1Mpc of the filament axis, but the simulations still overpredict the detection rate between 2.1 and 5Mpc from the axis. The baryonic mass inside filament galaxies is 1.4x10^13^M_{sun}_, while the mass of filament gas outside galaxy halos is found to be 5.2x10^13^M_{sun}_.2015ApJ...814...40Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/814/40CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)VIII/76 : Leiden/Argentine/Bonn (LAB) Survey of Galactic HI (Kalberla+ 2005)J/MNRAS/438/3465 : Cosmic web filaments in the SDSS (Tempel+, 2014)J/MNRAS/437/2017 : HI-galaxy cross-correlation at z<~1 (Tejos+, 2014)J/ApJS/182/378 : HI and OVI absorbers in nearby Universe (Wakker+, 2009)J/ApJS/177/39 : Survey of low-redshift OVI absorbers (Tripp+, 2008)J/ApJ/679/194 : Low-z intergalactic medium. III. (Danforth+, 2008)J/MNRAS/367/1261 : Redshift survey in 15 quasar fields (Morris+, 2006)J/AJ/130/873 : Properties of BQS objects in the SDSS DR3 area (Jester+, 2005)http://archive.stsci.edu/hst/index.html : Hubble Data Archive Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/814/40https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/814/40http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/814/40https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/814/40https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/814/40http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/814/40GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/814/40/table1 (Observations of the 24 targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/814/40/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/814/40/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/814/40/table1?GETtext/xml+votable180.050000true224.78166771.6722220.005555555555555556Cone search capability for table J/ApJ/814/40/table2 (Galaxies between 2400 and 4800km/s within 1Mpc of each sightline)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/814/40/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/814/40/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/814/40/table2?GETtext/xml+votable180.050000true5/2844 2845 2847 2868 6/10162 10170 10213 10214 10217 10218 10219 10220 11325 11327 11354 11367 11371 11387 11412 11413 11427 11430 11456 11462 11478 11480 11484 11490 11530 11535 11556 11557 11558 11560 11568 11583 11610 11658 11668 11686 11690 11691 11711 11731 11807 12033 12047 15311 15323 15351 16044https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/814/40?format=asciiOpticalUVdefaultJ/ApJ/814/40/table1Observations of the 24 targetsPIProgram PIobs.observercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget namemeta.id;meta.maincharprimaryRAJ2000[14/18] Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000[53/71] Degree of declination (J2000)pos.eq.dec;meta.mainz[0.02/1] Redshiftsrc.redshiftfloatPID[8015/12486] HST proposal IDmeta.id;obsintDatasetHST datasetmeta.datasetcharDateObservation datetime.epoch;obsnullableExp[0.6/26.5] Time exposurestime.epoch;obs.exposurefloatJ/ApJ/814/40/table2Galaxies between 2400 and 4800km/s within 1Mpc of each sightlineSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget nameobs.fieldcharprimaryGalGalaxy name or "Filament axis"meta.id;meta.maincharLya1? Ly{alpha} line detected; velocity of the absorber (1)km/sspect.line.widthintnullableLya2? Other Ly{alpha} line detected; velocity of the absorber (1)km/sspect.line.widthintnullablecz[2420/4429] cz redshiftkm/sphys.veloc;pos.heliocentricintDelV1[-1180/1105]? {Delta}{nu} for Lya1 (1)(2)km/sphys.veloc;arith.diffintnullableDelV2[-664/487]? {Delta}{nu} for Lya2 (1)km/sphys.veloc;arith.diffintnullablerho[91/6208] Impact parameter {rho}kpcsrc.impactParamintDiam[1/55.6]? Diameterkpcpos.distancefloatnullableL/L*[0/4.9]? LuminositysolLumphys.luminosityfloatnullableRvir[3/277]? Virial radiuskpcphys.size.radiusintnullablerho/R[1/1384.9]? Impact parameter to virial radius ratiosrc.impactParam;arith.ratiofloatnullableTypeGalaxy typesrc.morph.typecharNEDNED column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD or from SDSS names (right ascension part)degpos.eq.ra;meta.mainnullable_DEPositions from SIMBAD or from SDSS names (declination part)degpos.eq.dec;meta.mainnullable