2019MNRAS.486...21B -
Mon. Not. R. Astron. Soc., 486, 21-41 (2019/June-2)
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., STOTT J.P., CULLEN F., TRIPP T.M., BURCHETT J.N., FUMAGALLI M., MORRIS S.L., TEJOS N., CRAIN R.A., BOWER R.G. and PROCHASKA J.X.
Abstract (from CDS):
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 x 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.
Abstract Copyright:
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
Journal keyword(s):
galaxies: distances and redshifts - intergalactic medium - quasars: absorption lines
VizieR on-line data:
<Available at CDS (J/MNRAS/486/21): table4.dat>
Nomenclature:
Table 4: QSAGE JHHMMSS.ss+DDMMSS.s N=32.
Simbad objects:
34
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