Journal Article

The unchanging circumgalactic medium over the past 11 billion years

Hsiao-Wen Chen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 427, issue 2, pages 1238-1244
Published in print December 2012 | ISSN: 0035-8711
Published online December 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.22053.x
The unchanging circumgalactic medium over the past 11 billion years

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This paper examines how the circumgalactic medium (CGM) evolves as a function of time by comparing results from different absorption-line surveys that have been conducted in the vicinities of galaxies at different redshifts. Despite very different star formation properties of the galaxies considered in these separate studies and different intergalactic radiation fields at redshifts between z ≈ 2.2 and z ∼ 0, I show that both the spatial extent and mean absorption equivalent width of the CGM around galaxies of comparable mass have changed little over this cosmic time interval.

Keywords: surveys; galaxies: haloes; quasars: absorption lines; galaxies: star formation

Journal Article.  6503 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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