J/ApJS/243/24 The CASBaH galaxy redshift survey (Prochaska+, 2019)
The COS Absorption Survey of Baryon Harbors: the galaxy database and cross-
correlation analysis of O VI systems.
Prochaska J.X., Burchett J.N., Tripp T.M., Werk J.K., Willmer C.N.A.,
Howk J.C., Lange S., Tejos N., Meiring J.D., Tumlinson J., Lehner N.,
Ford A.B., Dave R.
<Astrophys. J. Suppl. Ser., 243, 24 (2019)>
=2019ApJS..243...24P 2019ApJS..243...24P
ADC_Keywords: Galaxy catalogs; Spectra, optical; Redshifts; Surveys; QSOs
Keywords: astronomical databases: miscellaneous ; galaxies: evolution ;
intergalactic medium ; quasars: absorption lines
Abstract:
We describe the survey for galaxies in the fields surrounding nine
sightlines to far-UV bright, z∼1 quasars that define the COS
Absorption Survey of Baryon Harbors (CASBaH) program. The photometry
and spectroscopy that comprise the data set come from a mixture of
public surveys (SDSS, DECaLS) and our dedicated efforts on private
facilities (Keck, MMT, LBT). We report the redshifts and stellar
masses for 5902 galaxies within ∼10 comoving-Mpc of the sightlines
with a median of {bar}z=0.28 and {bar}M*∼1010.1M☉. This
data set, publicly available as the CASBaH specDB, forms the basis of
several recent and ongoing CASBaH analyses. Here, we perform a
clustering analysis of the galaxy sample with itself
(auto-correlation) and against the set of O VI absorption systems
(cross-correlation) discovered in the CASBaH quasar spectra with
column densities N(O+5)≥1013.5/cm2. For each, we describe the
measured clustering signal with a power-law correlation function
ξ(r)=(r/r0)-γ and find that
(r0,γ)=(5.48±0.07h100-1Mpc,1.33±0.04) for the
auto-correlation and (6.00-0.77+1.09h100-1Mpc,1.25±0.18)
for galaxy-OVI cross-correlation. We further estimate a bias factor of
bgg=1.3±0.1 from the galaxy-galaxy auto-correlation, indicating
the galaxies are hosted by halos with mass
Mhalo∼1012.1±0.05M☉. Finally, we estimate an OVI-galaxy
bias factor bOVI=1.0±0.1 from the cross-correlation which is
consistent with OVI absorbers being hosted by dark matter halos with
typical mass Mhalo∼1011M☉. Future works with upcoming data
sets (e.g., CGM2) will improve upon these results and will assess
whether any of the detected OVI arises in the intergalactic medium.
Description:
We retrieved all photometric sources in the SDSS-DR12 catalog within
2° of the nine quasar fields, requesting Petrosian magnitudes and
errors. We then cross-matched these to the spectroscopic catalog and
cut on z>0.001666 (v>500km/s) to trim stars. These data form the
primary public data set integrated within our CASBaH database.
For seven fields, we obtained deep multi-band (UBVI or griz) images
with the Large Binocular Camera (LBC) on the Large Binocular Telescope
(LBT) between 2009 June and 2011 May. See section 2.2.2.
For all of the MMT/Hectospec data collected in our CASBaH survey, we
employed an identical setup, yielding R∼1000 with wavelength coverage
λob∼3700-9200Å. The observations, spanning 2011 Jan 25 to
2012 Mar 14, used three or more exposures with times ranging from 900
to 1800s each, for a total exposure of 3600s or 5400s. See section
2.3.1 and 3.1.1.
For the Keck/DEIMOS observations --spanning 2012 Nov 14 to 2013 May 8--
of the CASBaH target fields, the setup yields a spectral resolution
R∼1600 with wavelength coverage of λob∼5000-10000Å.
See section 2.3.2 and 3.1.2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table7.dat 53 10756 CASBaH redshift survey
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See also:
II/317 : The CFHTLS Survey (T0007 release) (Hudelot+ 2012)
II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)
II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
II/347 : KiDS-ESO-DR3 multi-band source catalog (de Jong+, 2017)
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
J/A+AS/108/287 : Atomic data (Verner+, 1994)
J/ApJ/508/200 : QSO low-z Lyα absorbers (Tripp+, 1998)
J/ApJS/177/39 : Survey of low-redshift OVI absorbers (Tripp+, 2008)
J/ApJ/701/1219 : Galaxy survey in 3 QSO fields (Chen+, 2009)
J/ApJ/704/898 : Photometry of the Hercules dwarf galaxy (Sand+, 2009)
J/ApJS/182/378 : HI and OVI absorbers in nearby Universe (Wakker+, 2009)
J/MNRAS/405/2302 : Improved redshifts for SDSS quasar spectra (Hewett+, 2010)
J/ApJS/193/28 : Galaxy survey around 20 UV-bright quasars (Prochaska+, 2011)
J/ApJ/740/91 : Lyα & OVI in galaxies around QSOs (Prochaska+, 2011)
J/ApJ/736/42 : HST QSO Catalog (Ribaudo+, 2011)
J/ApJ/770/138 : Metallicities of Lyman limit systems and DLA (Lehner+, 2013)
J/A+A/559/A85 : 1D Lya forest power spectrum (Palanque-Delabrouille+, 2013)
J/ApJ/776/136 : QPQ VI. HI absorption of z∼2 quasars (Prochaska+, 2013)
J/MNRAS/437/2017 : HI-galaxy cross-correlation at z≲1 (Tejos+, 2014)
J/MNRAS/438/3465 : Cosmic web filaments in the SDSS (Tempel+, 2014)
J/ApJ/815/91 : z<0.16 CIV absorbers from HST/COS QSOs sp. (Burchett+, 2015)
J/MNRAS/449/3263 : Extended galaxy halo gas through HI and OVI (Johnson+, 2015)
J/ApJ/814/40 : Nearby galaxy filaments with UV obs. (Wakker+, 2015)
J/ApJ/817/111 : HST/COS survey of z<0.9 AGNs. I. (Danforth+, 2016)
J/ApJS/237/11 : Gal. redshift survey near HST/COS AGNs (Keeney+, 2018)
Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq [0/10755] CASBaH sequence number;
<[PBT2019] NNNNN> for SIMBAD
7- 15 F9.5 deg RAdeg [36.9/249] Right Ascension (J2000)
17- 25 F9.5 deg DEdeg [-41.1/59.2] Declination (J2000)
27- 33 F7.4 --- z [-1/4.2] Redshift from emission lines
35- 41 F7.4 --- e_z [0.0001/12] Uncertainty in z (1)
43 I1 --- q_z [0/4]? Quality flag on z (4=best) (2)
45- 53 A9 --- Inst Instrument used (3)
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Note (1): We limit the error to a minimum of 1e-4 and advise readers
to adopt a minimum uncertainty of 35km/s.
Note (2): Quality flag on z as follows:
0 = Data too poor for any assessment (250 occurrences);
1 = Data poor and redshift highly uncertain (12 occurrences);
2 = Data quality good but no redshift determined (75 occurrences);
3 = Data quality good and redshift is highly likely but not confirmed
by multiple lines (or one line is of low S/N) (5486 occurrences);
4 = Highly certain and confirmed by multiple spectral features
(see also Newman+ 2013ApJS..208....5N 2013ApJS..208....5N) (4933 occurrences).
Note (3): Instrument as follows:
Hectospec = MMT/Hectospec observations from this paper (4853 occurrences);
DEIMOS = Keck/DEIMOS observations from this paper (1153 occurrences);
SDSS = SDSS BOSS-DR12 spectra (4645 occurrences);
COS = HST/COS spectra --CASBaH; HST Programs 11741 & 13846, PI Tripp
(2 occurrences);
LRISb = Keck/LRIS observations from Johnson+ 2015, J/MNRAS/449/3263
(2 occurrences);
RCS = (1 occurrence);
UNKNWN = Unknown (100 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Dec-2019