Quasar Sightline and Galaxy Evolution (QSAGE) survey - I. The galaxy environment of O VI absorbers up to z = 1.4 around PKS 0232-04

Bielby, R. M. and Stott, J. P. and Cullen, F. and Tripp, T. M. and Burchett, J. N. and Fumagalli, M. and Morris, S. L. and Tejos, N. and Crain, R. A. and Bower, R. G. and Prochaska, J. X. (2019) Quasar Sightline and Galaxy Evolution (QSAGE) survey - I. The galaxy environment of O VI absorbers up to z = 1.4 around PKS 0232-04. Monthly Notices of the Royal Astronomical Society, 486 (1). pp. 21-41. ISSN 0035-8711

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Abstract

We present the first results from a study of O VI absorption around galaxies at z <1.44 using data from a near-infrared grism spectroscopic Hubble Space Telescope Large Programme, the Quasar Sightline and Galaxy Evolution (QSAGE) survey. QSAGE is the first grism galaxy survey to focus on the circumgalactic medium at z ˜ 1, providing a blind survey of the galaxy population. The galaxy sample is H α flux limited (f(H α) > 2 × 10-17 erg s-1 cm-2) at 0.68 <z <1.44, corresponding to ≳0.2-0.8 M⊙ yr-1. In this first of 12 fields, we combine the galaxy data with high-resolution STIS and COS spectroscopy of the background quasar to study O VI in the circumgalactic medium. At z ˜ 1, we find O VI absorption systems up to b ˜ 350 kpc (˜4Rvir) from the nearest detected galaxy. Further, we find {˜ }50{{ per cent}} of ≳1 M⊙ yr-1 star-forming galaxies within 2Rvir show no associated O VI absorption to a limit of at least N(O VI) = 1013.9 cm-2. That we detect O VI at such large distances from galaxies and that a significant fraction of star-forming galaxies show no detectable O VI absorption disfavours outflows from ongoing star formation as the primary medium traced by these absorbers. Instead, by combining our own low- and high-redshift data with existing samples, we find tentative evidence for many strong (N(O VI) > 1014 cm-2) O VI absorption systems to be associated with M⋆ ˜ 109.5-10 M⊙ mass galaxies (Mhalo ˜ 1011.5-12 M⊙ dark matter haloes), and infer that they may be tracing predominantly collisionally ionized gas within the haloes of such galaxies.

Item Type: Journal Article
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Additional Information: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version R M Bielby, J P Stott, F Cullen, T M Tripp, J N Burchett, M Fumagalli, S L Morris, N Tejos, R A Crain, R G Bower, J X Prochaska, Quasar Sightline and Galaxy Evolution (QSAGE) survey – I. The galaxy environment of O VI absorbers up to z = 1.4 around PKS 0232−04, Monthly Notices of the Royal Astronomical Society, Volume 486, Issue 1, June 2019, Pages 21–41, https://doi.org/10.1093/mnras/stz774 is available online at: https://academic.oup.com/mnras/article/486/1/21/5382056
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 133236
Deposited By: ep_importer_pure
Deposited On: 26 Apr 2019 14:25
Refereed?: Yes
Published?: Published
Last Modified: 27 Feb 2020 04:52
URI: https://eprints.lancs.ac.uk/id/eprint/133236

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