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% 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

Bielby, R., Stott, J., Cullen, F., Tripp, T., Burchett, J., Fumagalli, M., et al. (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), 21-41 [10.1093/mnras/stz774].

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

Fumagalli M.;
2019

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% 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
Articolo in rivista - Articolo scientifico
galaxies: distances and redshifts; intergalactic medium; quasars: absorption lines
English
2019
486
1
21
41
reserved
Bielby, R., Stott, J., Cullen, F., Tripp, T., Burchett, J., Fumagalli, M., et al. (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), 21-41 [10.1093/mnras/stz774].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/258723
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