J/MNRAS/486/21 Quasar Sightline and Galaxy Evolution Survey I (Bielby+, 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.
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., Prochaska J.X.
<Mon. Not. R. Astron. Soc., 486, 21-41 (2019)>
=2019MNRAS.486...21B 2019MNRAS.486...21B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Galaxies, IR ; Intergalactic medium ; QSOs ;
Redshifts
Keywords: galaxies: distances and redshifts - intergalactic medium -
quasars: absorption lines
Abstract:
We present the first results from a study of OVI 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 Hα flux
limited (f(Hα)>2x10-17erg/s/cm2) at 0.68<z<1.44,
corresponding to ≳0.2-0.8M☉/yr. In this first of 12 fields, we
combine the galaxy data with high-resolution STIS and COS spectroscopy
of the background quasar to study OVI in the circumgalactic medium. At
z∼1, we find OVI absorption systems up to b∼350kpc (∼4Rvir) from the
nearest detected galaxy. Further, we find ∼50 per cent of
≳1M☉/yr star-forming galaxies within 2Rvir show no associated
OVI absorption to a limit of at least N(OVI)=1013.9cm-2. That we
detect OVI at such large distances from galaxies and that a
significant fraction of star-forming galaxies show no detectable OVI
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(OVI)>1014cm-2) OVI
absorption systems to be associated with M*∼109.5-10M☉ mass
galaxies (Mhalo∼1011.5-12M☉ dark matter haloes), and infer
that they may be tracing predominantly collisionally ionized gas
within the haloes of such galaxies.
Description:
The Quasar Sightline and Galaxy Evolution (QSAGE) survey targets 12
z≳1.2 quasars with the aim of mapping and characterizing the galaxy
populations in their foregrounds (HST Large Programme 14594; PIs: R.
Bielby, J. P. Stott). The full survey consists of 96 orbits with the
WFC3 in imaging and grism mode (i.e. 8 h per quasar sightline). In
this paper we focus on the first field to be fully analysed, centred
on the z=1.44 quasar PKS 0232-04, chosen due to the extensive data
available to complement the WFC3 grism and STIS sightline data:
Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) optical imaging
(Cuillandre et al. 2012SPIE.8448E..0MC), MUSE IFU data (MUSE Program
(096.A-0222, PI: Schaye)) and HST/COS sightline spectroscopy (CASBaH,
HST Programs 11741 and 13846, PI: T. Tripp).
Table 4 provides names, coordinates, and measured and derived
properties for galaxies found as part of the QSAGE survey in close
proximity to the quasar sightline of PKS 0232-04 (aka PHL 1377).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 119 32 Properties of proximate galaxies to the quasar
sightline
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- Name Galaxy name (QSAGEJHHMMSS.ss+DDMMSS.s)
26- 33 F8.5 deg RAdeg Right ascension (J2000)
35- 42 F8.5 deg DEdeg Declination (J2000)
44- 48 F5.2 mag F140Wmag HST/WFC3 F140W filter AB magnitude
50- 53 F4.2 mag e_F140Wmag Error on F140Wmag
55- 60 F6.4 --- z Redshift
62- 64 I3 kpc b Impact parameter to QSO sightline
66- 70 F5.2 [Msun] logMass Logarithm of galaxy stellar mass
72- 75 F4.2 [Msun] e_logMass Lower error on logMass
77- 80 F4.2 [Msun] E_logMass Upper error on logMass
82- 85 F4.1 [Msun] logMhalo Logarithm of halo mass
87- 89 F3.1 [Msun] e_logMhalo Lower error on logMhalo
91- 93 F3.1 [Msun] E_logMhalo Upper error on logMhalo
95- 97 I3 kpc Rvir Virial radius
99-100 I2 kpc e_Rvir Lower error on Rvir
102-103 I2 kpc E_Rvir Upper error on Rvir
105-109 F5.2 [Msun/yr] logSFR Star formation rate
111-114 F4.2 [Msun/yr] e_logSFR Lower error on logSFR
116-119 F4.2 [Msun/yr] E_logSFR Upper error on logSFR
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 12-Oct-2022