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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Not dead yet: Cool circumgalactic gas in the halos of early-type galaxies
Astrophysical Journal Letters, Volume 758, No. 2, Article L41, Year 2012
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Description
We report new observations of circumgalactic gas in the halos of early-type galaxies (ETGs) obtained by the COS-Halos Survey with the Cosmic Origins Spectrograph on board the Hubble Space Telescope. We find that detections of H I surrounding ETGs are typically as common and strong as around star-forming galaxies, implying that the total mass of circumgalactic material is comparable in the two populations. For ETGs, the covering fraction for H I absorption above 1016 cm-2 is 40%-50% within 150 kpc. Line widths and kinematics of the detected material show it to be cold (T ≲ 105 K) in comparison to the virial temperature of the host halos. The implied masses of cool, photoionized circumgalactic medium baryons may be up to 10 9-1011 M. Contrary to some theoretical expectations, strong halo H I absorbers do not disappear as part of the quenching of star formation. Even passive galaxies retain significant reservoirs of halo baryons that could replenish the interstellar gas reservoir and eventually form stars. This halo gas may feed the diffuse and molecular gas that is frequently observed inside ETGs. © © 2012. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Thom, Christopher
United States, Baltimore
Space Telescope Science Institute
Tumlinson, Jason
United States, Baltimore
Space Telescope Science Institute
Werk, Jessica K.
United States, Santa Cruz
University of California, Santa Cruz
Xavier Prochaska, J.
United States, Santa Cruz
University of California, Santa Cruz
Oppenheimer, Benjamin Darwin
Netherlands, Leiden
Universiteit Leiden
Peeples, Molly S.
United States, Los Angeles
University of California, Los Angeles
Tripp, Todd M.
United States, Amherst
University of Massachusetts Amherst
Katz, Neal S.
United States, Amherst
University of Massachusetts Amherst
O'Meara, John M.
United States, Colchester
Saint Michael's College
Ford, Amanda Brady
United States, Tucson
The University of Arizona
Dav́e, Romeel
United States, Tucson
The University of Arizona
Sembach, Kenneth R.
United States, Baltimore
Space Telescope Science Institute
Weinberg, David H.
United States, Columbus
The Ohio State University
Statistics
Citations: 124
Authors: 13
Affiliations: 8
Identifiers
Doi:
10.1088/2041-8205/758/2/L41
ISSN:
20418213
Study Design
Cross Sectional Study
Study Approach
Quantitative