The COS-Halos survey: Rationale, design and a census of circumgalactic neutral hydrogen

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dc.contributor.authorTumlinson, Jason
dc.contributor.authorThom, Christopher
dc.contributor.authorDave, Romeel
dc.contributor.authorWerk, Jessica K.
dc.contributor.authorProchaska, J. Xavier
dc.contributor.authorTripp, Todd M.
dc.contributor.authorKatz, Neal
dc.contributor.authorOppenheimer, Benjamin D.
dc.contributor.authorMeiring, Joseph D.
dc.contributor.authorFord, Amanda Brady
dc.contributor.authorO'Meara, John M.
dc.contributor.authorPeeples, Molly S.
dc.contributor.authorSembach, Kenneth R.
dc.contributor.authorWeinberg, David H.
dc.date.accessioned2017-07-24T08:52:57Z
dc.date.available2017-07-24T08:52:57Z
dc.date.issued2013
dc.description.abstractWe present the design and methods of the COS-Halos survey, a systematic investigation of the gaseous halos of 44 z = 0.15–0.35 galaxies using background QSOs observed with the Cosmic Origins Spectrograph aboard the Hubble Space Telescope. This survey has yielded 39 spectra of zem 0.5 QSOs with S/N ∼10–15 per resolution element. The QSO sightlines pass within 150 physical kpc of the galaxies, which span early and late types over stellar mass logM∗/M = 9.5–11.5. We find that the circumgalactic medium exhibits strong Hi, averaging 1Å in Lyα equivalent width out to 150 kpc, with 100% covering fraction for star-forming galaxies and 75% covering for passive galaxies. We find good agreement in column densities between this survey and previous studies over similar range of impact parameter. There is weak evidence for a difference between early- and late-type galaxies in the strength and distribution of Hi. Kinematics indicate that the detected material is bound to the host galaxy, such that 90% of the detected column density is confined within ±200 km s−1 of the galaxies. This material generally exists well below the halo virial temperatures at T 105 K. We evaluate a number of possible origin scenarios for the detected material, and in the end favor a simple model in which the bulk of the detected Hi arises in a bound, cool, low-density photoionized diffuse medium that is generic to all L ∗ galaxies and may harbor a total gaseous mass comparable to galactic stellar masses.en_US
dc.description.accreditationDepartment of HE and Training approved list
dc.identifier.citationTumlinson, J. et al. (2013). The COS-Halos survey: Rationale, design and a census of circumgalactic neutral hydrogen. The Astrophysical Journal , 777 (59): 1-33en_US
dc.identifier.issn0004-637x
dc.identifier.urihttp://hdl.handle.net/10566/3098
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.rightsPublisher retains copyright. Authors may archive the published version in their institutional repository.
dc.source.urihttp://dx.doi.org/10.1088/0004-637X/777/1/59
dc.subjectGalaxiesen_US
dc.subjectFormation – galaxiesen_US
dc.subjectHalos – intergalactic medium – quasarsen_US
dc.subjectAbsorption linesen_US
dc.titleThe COS-Halos survey: Rationale, design and a census of circumgalactic neutral hydrogenen_US
dc.typeArticleen_US

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