The COS-Halos Survey: Rationale, Design, and a Census of Circumgalactic Neutral Hydrogen

Jason Tumlinson; Christopher Thom; Jessica K. Werk; J. Xavier Prochaska; Todd M. Tripp; Neal Katz; Romeel Davé; Benjamin D. Oppenheimer; Joseph D. Meiring; Amanda Brady Ford; John M. O'Meara; Molly S. Peeples; Kenneth R. Sembach; David H. Weinberg

doi:10.1088/0004-637X/777/1/59

The COS-Halos Survey: Rationale, Design, and a Census of Circumgalactic Neutral Hydrogen

Jason Tumlinson, Christopher Thom, Jessica K. Werk, J. Xavier Prochaska, Todd M. Tripp, Neal Katz, Romeel Davé, Benjamin D. Oppenheimer, Joseph D. Meiring, Amanda Brady Ford, John M. O'Meara, Molly S. Peeples, Kenneth R. Sembach, David H. Weinberg

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

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

Original language	English
Pages (from-to)	59
Journal	Astrophysical Journal
Volume	777
Issue number	1
DOIs	https://doi.org/10.1088/0004-637X/777/1/59
Publication status	Published - 17 Oct 2013

Keywords / Materials (for Non-textual outputs)

galaxies: formation
galaxies: halos
intergalactic medium
quasars: absorption lines

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10.1088/0004-637X/777/1/59

http://adsabs.harvard.edu/abs/2013ApJ...777...59T

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Tumlinson, J., Thom, C., Werk, J. K., Prochaska, J. X., Tripp, T. M., Katz, N., Davé, R., Oppenheimer, B. D., Meiring, J. D., Ford, A. B., O'Meara, J. M., Peeples, M. S., Sembach, K. R., & Weinberg, D. H. (2013). The COS-Halos Survey: Rationale, Design, and a Census of Circumgalactic Neutral Hydrogen. Astrophysical Journal, 777(1), 59. https://doi.org/10.1088/0004-637X/777/1/59

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title = "The COS-Halos Survey: Rationale, Design, and a Census of Circumgalactic Neutral Hydrogen",

abstract = "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 {\AA} 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 ",

keywords = "galaxies: formation, galaxies: halos, intergalactic medium, quasars: absorption lines",

author = "Jason Tumlinson and Christopher Thom and Werk, {Jessica K.} and Prochaska, {J. Xavier} and Tripp, {Todd M.} and Neal Katz and Romeel Dav{\'e} and Oppenheimer, {Benjamin D.} and Meiring, {Joseph D.} and Ford, {Amanda Brady} and O'Meara, {John M.} and Peeples, {Molly S.} and Sembach, {Kenneth R.} and Weinberg, {David H.}",

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doi = "10.1088/0004-637X/777/1/59",

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T1 - The COS-Halos Survey: Rationale, Design, and a Census of Circumgalactic Neutral Hydrogen

AU - Tumlinson, Jason

AU - Thom, Christopher

AU - Werk, Jessica K.

AU - Prochaska, J. Xavier

AU - Tripp, Todd M.

AU - Katz, Neal

AU - Davé, Romeel

AU - Oppenheimer, Benjamin D.

AU - Meiring, Joseph D.

AU - Ford, Amanda Brady

AU - O'Meara, John M.

AU - Peeples, Molly S.

AU - Sembach, Kenneth R.

AU - Weinberg, David H.

PY - 2013/10/17

Y1 - 2013/10/17

N2 - 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

AB - 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

KW - galaxies: formation

KW - galaxies: halos

KW - intergalactic medium

KW - quasars: absorption lines

U2 - 10.1088/0004-637X/777/1/59

DO - 10.1088/0004-637X/777/1/59

M3 - Article

SN - 0004-637X

VL - 777

SP - 59

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

ER -

The COS-Halos Survey: Rationale, Design, and a Census of Circumgalactic Neutral Hydrogen

Abstract

Keywords / Materials (for Non-textual outputs)

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