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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The cos-halos survey: Rationale, design, and a census of circumgalactic neutral hydrogen
Astrophysical Journal, Volume 777, No. 1, Article 59, Year 2013
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Description
We 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 z em ≃ 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 log M ⊙*/M ⊙ = 9.5-11.5. We find that the circumgalactic medium exhibits strong H I, averaging ≃ 1 Å 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 H I. 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 H I 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. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Tumlinson, Jason
United States, Baltimore
Space Telescope Science Institute
Thom, Christopher
United States, Baltimore
Space Telescope Science Institute
Werk, Jessica K.
United States, Mount Hamilton
Lick Observatory
Prochaska, Jason Xavier
United States, Mount Hamilton
Lick Observatory
Tripp, Todd M.
United States, Amherst
University of Massachusetts Amherst
Katz, Neal S.
United States, Amherst
University of Massachusetts Amherst
Dav́e, Romeel
South Africa, Bellville
University of the Western Cape
United States, Tucson
The University of Arizona
Oppenheimer, Benjamin Darwin
Netherlands, Leiden
Sterrewacht Leiden
United States, Boulder
University of Colorado Boulder
Meiring, Joseph D.
United States, Amherst
University of Massachusetts Amherst
Ford, Amanda Brady
United States, Tucson
The University of Arizona
O'Meara, John M.
United States, Colchester
Saint Michael's College
Peeples, Molly S.
United States, Los Angeles
University of California, Los Angeles
Sembach, Kenneth R.
United States, Baltimore
Space Telescope Science Institute
Weinberg, David H.
United States, Columbus
The Ohio State University
Statistics
Citations: 235
Authors: 14
Affiliations: 10
Identifiers
Doi:
10.1088/0004-637X/777/1/59
ISSN:
0004637X
e-ISSN:
15384357
Study Design
Cross Sectional Study
Study Approach
Quantitative