J/ApJ/927/147 CGM2 galaxy-OVI absorber pairs (Tchernyshyov+, 2022)
The CGM2 survey: circumgalactic OVI from dwarf to massive star-forming
galaxies.
Tchernyshyov K., Werk J.K., Wilde M.C., Prochaska J.X., Tripp T.M.,
Burchett J.N., Bordoloi R., Howk J.C., Lehner N., O'Meara J.M., Tejos N.,
Tumlinson J.
<Astrophys. J., 927, 147 (2022)>
=2022ApJ...927..147T 2022ApJ...927..147T
ADC_Keywords: Intergalactic medium; Galaxies, spectra; QSOs; Redshifts;
Spectra, ultraviolet
Keywords: Circumgalactic medium ; Extragalactic astronomy
Abstract:
We combine 126 new galaxy-OVI absorber pairs from the CGM2 survey
with 123 pairs drawn from the literature to examine the simultaneous
dependence of the column density of OVI absorbers (NOVI) on galaxy
stellar mass, star-formation rate, and impact parameter. The combined
sample consists of 249 galaxy-OVI absorber pairs covering z=0-0.6,
with host galaxy stellar masses M*=107.8-1011.2M☉ and
galaxy-absorber impact parameters R⊥=0-400 proper kiloparsecs.
In this work, we focus on the variation of NOVI with galaxy mass and
impact parameter among the star-forming galaxies in the sample. We
find that the average NOVI within one virial radius of a
star-forming galaxy is greatest for star-forming galaxies with
M*=109.2-1010M☉. Star-forming galaxies with M* between
108 and 1011.2M☉ can explain most OVI systems with column
densities greater than 1013.5cm-2. Sixty percent of the OVI mass
associated with a star-forming galaxy is found within one virial
radius, and 35% is found between one and two virial radii. In general,
we find that some departure from hydrostatic equilibrium in the CGM is
necessary to reproduce the observed OVI amount, galaxy mass
dependence, and extent. Our measurements serve as a test set for CGM
models over a broad range of host galaxy masses.
Description:
OVI absorbers are measured from medium-resolution FUV spectra of
quasars. We combine our own measurements with ones drawn from earlier
surveys of galaxies and OVI absorbers.
Our new galaxy data set is drawn from the Cosmic Origins Spectrograph
(COS) and Gemini Mapping the Circumgalactic Medium (CGM2) survey
(Wilde+ 2021ApJ...912....9W 2021ApJ...912....9W). The CGM2 survey provides secure
spectroscopic redshifts for 971 galaxies in the foreground of 22 QSOs
with Hubble Space Telescope (HST)/Cosmic Origins Spectrograph (COS)
far-ultraviolet (FUV) spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 86 249 Galaxy-absorber pairs
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See also:
B/hst : HST Archived Exposures Catalog (STScI, 2007)
J/ApJS/168/213 : Ionization states and cooling efficiencies (Gnat+, 2007)
J/ApJS/177/39 : Survey of low-redshift OVI absorbers (Tripp+, 2008)
J/ApJ/740/91 : Lya and OVI in galaxies around quasars (Prochaska+, 2011)
J/ApJ/749/157 : Far-UV sp. of Galactic corona sight lines (Wakker+, 2012)
J/MNRAS/449/3263 : Extended galaxy halo gas through HI and OVI (Johnson+, 2015)
J/ApJ/817/111 : HST/COS survey of z<0.9 AGNs. I. (Danforth+, 2016)
J/ApJS/230/6 : HST -COS & -STIS abs.-line spectroscopy. II. (Keeney+, 2017)
J/MNRAS/475/2067 : Galaxy survey data in QSO/cluster fields (Burchett+, 2018)
J/ApJS/237/11 : Redshift survey near HST/COS AGN sight lines (Keeney+, 2018)
J/MNRAS/486/21 : QSO Sightline and Galaxy Evolution Survey I (Bielby+, 2019)
J/ApJS/243/24 : The CASBaH galaxy redshift survey (Prochaska+, 2019)
J/ApJS/240/15 : HST/COS UV obs. of low-z SDSS galaxy groups (Stocke+, 2019)
J/ApJ/900/9 : AMIGA: Circumgalactic Medium of Andromeda (Lehner+, 2020)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Survey Source survey (1)
14- 37 A24 --- QSO QSO identifier
39- 46 F8.4 deg RAdeg [28.8/344.4] Right Ascension (J2000)
48- 55 F8.4 deg DEdeg [-75.3/64.4] Declination (J2000)
57- 62 F6.4 --- z [0.002/0.6] Redshift
64- 66 I3 kpc R [11/399] Impact parameter (2)
68- 71 F4.1 [Msun] logMs [7.8/11.2] log stellar mass
73- 74 A2 --- MType Galaxy type (3)
76- 78 I3 kpc R200c [65/515] Virial radius (2)
80- 84 F5.2 [cm-2] logNOVI [12.6/15] log OVI column density
86 A1 --- l_logNOVI Limit flag on logNOVI
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Note (1): Survey (see Table 1) as follows:
COS-Halos = Werk+ (2012ApJS..198....3W 2012ApJS..198....3W & 2013ApJS..204...17W 2013ApJS..204...17W);
37 occurrences
eCGM = Johnson+ (2015, J/MNRAS/449/3263); 33 occurrences
Johnson+2017 = Johnson+ (2017ApJ...850L..10J 2017ApJ...850L..10J); 11 occurrences
Keeney+2017 = Keeney+ (2017, J/ApJS/230/6); 13 occurrences
Keeney+2018 = Keeney+ (2018, J/ApJS/237/11); Danforth+ (2016, J/ApJ/817/111);
Stocke+ (2019, J/ApJS/240/15); 18 occurrences
COS-LRG = Chen+ (2018MNRAS.479.2547C 2018MNRAS.479.2547C); Zahedy+ (2019MNRAS.484.2257Z 2019MNRAS.484.2257Z);
7 occurrences
RDR = Berg+ (2019ApJ...883....5B 2019ApJ...883....5B); 2 occurrences
QSAGE = Bielby+ (2019, J/MNRAS/486/21); 2 occurrences
CGM2 = Wilde+ (2021ApJ...912....9W 2021ApJ...912....9W); 126 occurrences
Note (2): Given in physical, not co-moving kiloparsecs.
Note (3): Galaxy type as follows:
SF = star-forming (197 occurrences)
E = quiescent (52 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Jan-2024