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Title: NOT DEAD YET: COOL CIRCUMGALACTIC GAS IN THE HALOS OF EARLY-TYPE GALAXIES

Abstract

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 10{sup 16} cm{sup -2} is {approx}40%-50% within {approx}150 kpc. Line widths and kinematics of the detected material show it to be cold (T {approx}< 10{sup 5} 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{sup 9}-10{sup 11} M{sub Sun }. 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.

Authors:
; ;  [1]; ;  [2];  [3];  [4]; ;  [5];  [6]; ;  [7];  [8]
  1. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
  2. UCO/Lick Observatory, University of California, Santa Cruz, CA 95064 (United States)
  3. Leiden Observatory, Leiden University, P.O. Box 9513, NL-2300 RA Leiden (Netherlands)
  4. Department of Physics and Astronomy, University of California Los Angeles, Los Angeles, CA 90095 (United States)
  5. Department of Astronomy, University of Massachusetts, Amherst, MA 01003-9305 (United States)
  6. Department of Chemistry and Physics, Saint Michael's College, Colchester, VT 05439 (United States)
  7. Steward Observatory, University of Arizona, 933 N. Cherry Avenue, Tucson, AZ 85721 (United States)
  8. Department of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210 (United States)
Publication Date:
OSTI Identifier:
22078479
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 758; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; BARYONS; GALAXIES; LINE WIDTHS; ORIGIN; PHOTOIONIZATION; QUENCHING; SPECTROSCOPY; STARS; TELESCOPES

Citation Formats

Thom, Christopher, Tumlinson, Jason, Sembach, Kenneth R., Werk, Jessica K., Xavier Prochaska, J., Oppenheimer, Benjamin D., Peeples, Molly S., Tripp, Todd M., Katz, Neal S., O'Meara, John M., Ford, Amanda Brady, Dave, Romeel, and Weinberg, David H. NOT DEAD YET: COOL CIRCUMGALACTIC GAS IN THE HALOS OF EARLY-TYPE GALAXIES. United States: N. p., 2012. Web. doi:10.1088/2041-8205/758/2/L41.
Thom, Christopher, Tumlinson, Jason, Sembach, Kenneth R., Werk, Jessica K., Xavier Prochaska, J., Oppenheimer, Benjamin D., Peeples, Molly S., Tripp, Todd M., Katz, Neal S., O'Meara, John M., Ford, Amanda Brady, Dave, Romeel, & Weinberg, David H. NOT DEAD YET: COOL CIRCUMGALACTIC GAS IN THE HALOS OF EARLY-TYPE GALAXIES. United States. doi:10.1088/2041-8205/758/2/L41.
Thom, Christopher, Tumlinson, Jason, Sembach, Kenneth R., Werk, Jessica K., Xavier Prochaska, J., Oppenheimer, Benjamin D., Peeples, Molly S., Tripp, Todd M., Katz, Neal S., O'Meara, John M., Ford, Amanda Brady, Dave, Romeel, and Weinberg, David H. Sat . "NOT DEAD YET: COOL CIRCUMGALACTIC GAS IN THE HALOS OF EARLY-TYPE GALAXIES". United States. doi:10.1088/2041-8205/758/2/L41.
@article{osti_22078479,
title = {NOT DEAD YET: COOL CIRCUMGALACTIC GAS IN THE HALOS OF EARLY-TYPE GALAXIES},
author = {Thom, Christopher and Tumlinson, Jason and Sembach, Kenneth R. and Werk, Jessica K. and Xavier Prochaska, J. and Oppenheimer, Benjamin D. and Peeples, Molly S. and Tripp, Todd M. and Katz, Neal S. and O'Meara, John M. and Ford, Amanda Brady and Dave, Romeel and Weinberg, David H.},
abstractNote = {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 10{sup 16} cm{sup -2} is {approx}40%-50% within {approx}150 kpc. Line widths and kinematics of the detected material show it to be cold (T {approx}< 10{sup 5} 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{sup 9}-10{sup 11} M{sub Sun }. 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.},
doi = {10.1088/2041-8205/758/2/L41},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 2,
volume = 758,
place = {United States},
year = {2012},
month = {10}
}