J/MNRAS/475/2067 Galaxy survey data in QSO/cluster fields (Burchett+, 2018)
Warm-hot gas in X-ray bright galaxy clusters and the H I-deficient
circumgalactic medium in dense environments.
Burchett J.N., Tripp T.M., Wang Q.D., Willmer C.N.A., Bowen D.V.,
Jenkins E.B.
<Mon. Not. R. Astron. Soc., 475, 2067-2085 (2018)>
=2018MNRAS.475.2067B 2018MNRAS.475.2067B (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; X-ray sources ; Optical ; Redshifts
Keywords: galaxies: clusters: intracluster medium - galaxies: evolution -
galaxies: groups: general - galaxies: haloes -
quasars: absorption lines - X-rays: galaxies: clusters
Abstract:
We analyse the intracluster medium (ICM) and circumgalactic medium
(CGM) in seven X-ray-detected galaxy clusters using spectra of
background quasi-stellar objects (QSOs) (HST-COS/STIS), optical
spectroscopy of the cluster galaxies (MMT/Hectospec and SDSS), and
X-ray imaging/spectroscopy (XMM-Newton and Chandra). First, we report
a very low covering fraction of HI absorption in the CGM of these
cluster galaxies, fc=25+25^-15 percent, to stringent detection
limits (N(HI)<1013cm-2). As field galaxies have an HI covering
fraction of ∼100 per cent at similar radii, the dearth of CGM HI in
our data indicates that the cluster environment has effectively
stripped or overionized the gaseous haloes of these cluster galaxies.
Secondly, we assess the contribution of warm-hot (105-106K) gas to
the ICM as traced by OVI and broad Lyα (BLA) absorption.
Despite the high signal-to-noise ratio of our data, we do not detect
OVI in any cluster, and we only detect BLA features in the QSO
spectrum probing one cluster. We estimate that the total column
density of warm-hot gas along this line of sight totals to ∼3 per cent
of that contained in the hot T>107K X-ray emitting phase.
Residing at high relative velocities, these features may trace
pre-shocked material outside the cluster. Comparing gaseous galaxy
haloes from the low-density 'field' to galaxy groups and high-density
clusters, we find that the CGM is progressively depleted of HI with
increasing environmental density, and the CGM is most severely
transformed in galaxy clusters. This CGM transformation may play a key
role in environmental galaxy quenching.
Description:
We present the coordinates and redshifts for all galaxies
spectroscopically measured, either through our own observations or
through those provided by the SDSS, in the QSO/cluster fields featured
in this work. In the table provided, the large majority of objects are
drawn from our survey with MMT/Hectospec, for which the redshift
measurement software provides quality scores that reflect the
confidence of the measurement.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 116 3251 Galaxy survey data in QSO/cluster fields
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Field Field name (A1095, A1926 or A2246)
7- 30 A24 --- Name Galaxy name
32- 44 F13.9 deg RAdeg Right ascension (J2000)
46- 58 F13.10 deg DEdeg Declination (J2000)
60- 77 E18.15 --- z Redshift
79- 96 F18.15 --- e_z rms uncertainty on z
98- 99 I2 --- Qual [-4/4] Quality flag (1)
101-106 A6 --- Class Object class
108-116 A9 --- Source Source (Hectospec, SDSS or La Palma)
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Note (1): Quality flag as follows:
0 = not explained in the paper (1 source)
1 = no features recognized
2 = probability P<90% of being correct
3 = probability 90%<P<95% of being correct
4 = probability P>95% of being correct
-4 = not explained in the paper (415 sources)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Apr-2021