J/MNRAS/480/1022 Black-hole growth and cosmic environment (Yang+, 2018)
Does black-hole growth depend on the cosmic environment?
Yang G., Brandt W.N., Darvish B., Chen C.-T.J., Vito F., Alexander D.M.,
Bauer F.E., Trump J.R.
<Mon. Not. R. Astron. Soc., 480, 1022-1042 (2018)>
=2018MNRAS.480.1022Y 2018MNRAS.480.1022Y (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Black holes ; Galaxies ; X-ray sources
Keywords: galaxies: active - galaxies: evolution -
galaxies: nuclei, large-scale structure of Universe - X-rays: galaxies
Abstract:
It is well known that environment affects galaxy evolution, which is
broadly related to supermassive black hole (SMBH) growth. We
investigate whether SMBH evolution also depends on host-galaxy local
(sub-Mpc) and global (∼1-10Mpc) environment. We construct the
surface-density field (local environment) and cosmic web (global
environment) in the Cosmic Evolution Survey (COSMOS) field at
z=0.3-3.0. The environments in COSMOS range from the field to clusters
(Mhalo~<1014M☉), covering the environments where ∼99 per cent
of galaxies in the Universe reside. We measure sample-averaged SMBH
accretion rate ({mean}BHAR) from X-ray observations, and study its
dependence on overdensity and cosmic-web environment at different
redshifts while controlling for galaxy stellar mass (M*). Our
results show that {mean}BHAR does not significantly depend on
overdensity or cosmic-web environment once M* is controlled,
indicating that environment-related physical mechanisms (e.g. tidal
interaction and ram-pressure stripping) might not significantly affect
SMBH growth. We find that {mean}BBHAR is strongly related to
host-galaxy M*, regardless of environment.
Description:
Our data are based on the COSMOS2015 survey (Laigle et al.
2016ApJS..224...24L 2016ApJS..224...24L, Cat. J/ApJS/224/24). We only utilize sources
within both the COSMOS and UltraVISTA regions, and remove objects in
masked regions (e.g. bad pixels in detectors). We restrict our study
to the ∼170000 sources brighter than KS=24 (the 3σ limiting
magnitude of the COSMOS2015 catalogue) to avoid large uncertainties of
photo-z for faint sources.
Table 2 is sorted in ascending order of RA and shows for each source
the J2000 coordinates, KS AB magnitude from the COSMOS2015
catalogue, redshift and redshift 1σ lower and upper limits,
stellar mass, galaxy type, overdensity, cosmic-web environment and
X-ray luminosity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 85 165961 Source catalogue
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See also:
J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right Ascension (J2000)
12- 19 F8.6 deg DEdeg Declination (J2000)
21- 27 F7.4 mag Ksmag Ks AB magnitude from the COSMOS2015
catalogue (Laigle et al.
2016ApJS..224...24L 2016ApJS..224...24L, Cat. J/ApJS/224/24)
29- 36 F8.6 --- z Redshift (1)
38- 45 F8.6 --- e_z Redshift 1σ lower limit (2)
47- 54 F8.6 --- E_z Redshift 1σ upper limit (2)
56- 63 F8.5 [Msun] logMstar Stellar mass
65 I1 --- Typegal [0/1] Galaxy type
(0:quiescent; 1:star-forming)
67- 74 F8.5 --- log(1+d) Overdensity (3)
76 I1 --- Web [0/2] Cosmic-web environment
(0:cluster; 1:filament; 2:field) (4)
78- 85 F8.4 [10-7W] logLx ?=-99.0000 X-ray luminosity
(rest-frame 2-10keV) (5)
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Note (1): We obtain secure spectroscopic redshifts (spec-z) for ∼20000 sources
in our sample. For sources without spec-z, we adopt the photo-z
measurements from the COSMOS2015 catalogue.
Note (2): For sources with secure spectroscopic redshifts, the lower and upper
limits are set the same as the redshift value.
Note (3): We quantify the local environment for each source via the
dimensionless overdensity parameter, defined as:
1+δ=Σ/Σmedian
Where Σ is the surface number density for each source
(in Mpc-2) and Σmedian is the median Σ at each
redshift.
Note (4): We do not assign cluster environment at z>1.2 due to its generally
weak signals.
Note (5): For X-ray-undetected sources, the values are set to '99.0000'.
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 13-May-2022