J/A+A/653/A74 Bootes field X-ray/non-X-ray sources (Mountrichas+, 2021)
The role of AGN and obscuration in the position of the host galaxy relative to
the main sequence.
Mountrichas G., Buat V., Yang G., Boquien M., Burgarella D., Ciesla L.,
Malek K., Shirley R.
<Astron. Astrophys. 653, A74 (2021)>
=2021A&A...653A..74M 2021A&A...653A..74M (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; X-ray sources ; Redshifts
Keywords: galaxies: active - methods: observational - galaxies: star formation -
X-rays: galaxies
Abstract:
We use X-ray active galactic nuclei (AGN) observed by the Chandra
X-ray Observatory within the 9.3deg2 Bootes field of the NDWFS to
study whether there is a correlation between X-ray luminosity (LX) and
star formation rate (SFR) of the host galaxy, at 0.5<z<2.0, with
respect to the position of the galaxy to the main sequence (SFRnorm).
About half of the sources in the X-ray sample have spectroscopic
redshifts. We also construct a reference galaxy catalogue. For both
datasets we use photometric data from the optical to the far-infrared
compiled by the HELP project, and apply spectral energy distribution
(SED) fitting, using the X-CIGALE code. We exclude quiescent sources
from both the X-ray and the reference samples. We also account for the
mass completeness of our dataset, in different redshifts bins. Our
analysis highlights the importance of studying the SFR-LX relation in
a uniform manner, taking into account systematics and selection effects.
Our results suggest, in less massive galaxies (log[M*(M☉)]∼11),
that an AGN enhances the SFR of the host galaxy by 50% compared to
non-AGN systems. A flat relation is observed for the most massive
galaxies. The SFRnorm does not evolve with redshift. The results,
although tentative, are consistent with a scenario where, in less
massive systems, both AGN and star formation are fed by cold gas
supplied by a merger event. In more massive galaxies the flat relation
could be explained by a different supermasssive black hole (SMBH)
fuelling mechanism that is decoupled from the star formation of the
host galaxy (e.g. hot diffuse gas). Finally, we compare the host galaxy
properties of X-ray absorbed and unabsorbed sources. Our results show
no difference, which suggests that X-ray absorption is not linked with
the properties of the galaxy.
Description:
Host galaxy properties of X-ray and non X-ray sources in the Bootes
field, used in the analysis of the paper. Additionally, for the X-ray
sources, the logarithms of the hydrogen column density and the hard
(2-10 keV) X-ray luminosity are provided from the Masini et al.
(2020ApJS..251....2M 2020ApJS..251....2M, Cat. J/ApJS/251/2) catalogue. The quiescent
index indicates whether the galaxy is quiescent (0) or non-quiescent
(1).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
xray.dat 85 1020 Host galaxy properties of X-ray sources
in the Bootes field
nonxray.dat 61 18248 Host galaxy properties of non X-ray sources
in the Bootes field
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See also:
J/ApJS/251/2 : CDWFS: Chandra survey in Bootes. I. X-ray cat. (Masini+, 2020)
Byte-by-byte Description of file: xray.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 27 A27 --- HELP HELP designation, HELP_JHHMMSS.sss+DDMMSS.sss
(ID_HELP)
29- 32 I4 --- XRay X-ray identification number,
will be [MHC2020] NNNN in Simbad (ID_XRAY) (1)
34- 41 F8.6 --- z Redshift (redshift)
43- 51 F9.4 Msun/yr SFR Star formation rate (bayes.sfh.sfr)
53- 64 E12.7 Msun Mstar Stellar mass (bayes.stellar.m_star)
66- 70 F5.2 [cm-2] logNH Hydrogen column density (LOG_NH) (1)
72- 83 E12.7 10-7W LX X-ray luminosity in 2-10keV band
(LINT_2-10) (1)
85 I1 --- Quiet [0/1] Quiescent index (quiescent_index) (G1)
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Note (1): from Masini et al., 2020ApJS..251....2M 2020ApJS..251....2M, Cat. J/ApJS/251/2.
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Byte-by-byte Description of file: nonxray.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 27 A27 --- HELP HELP designation, HELP_JHHMMSS.sss+DDMMSS.sss
(ID_HELP)
29- 36 F8.6 --- z Redshift (redshift)
38- 46 F9.4 Msun/yr SFR Star formation rate (bayes.sfh.sfr)
48- 59 E12.7 Msun Mstar Stellar mass (bayes.stellar.m_star)
61 I1 --- Quiet [0/1] Quiescent index (quiescent_index) (G1)
--------------------------------------------------------------------------------
Global notes:
Note (G1): Quiescent index as follows:
0 = quiescent galaxy
1 = non-quiescent galaxy
--------------------------------------------------------------------------------
Acknowledgements:
Georgios Mountrichas, gmountrichas(at)gmail.com
(End) Patricia Vannier [CDS] 12-Jul-2021