2019MNRAS.483.3545G

Query : 2019MNRAS.483.3545G

2019MNRAS.483.3545G - Mon. Not. R. Astron. Soc., 483, 3545-3565 (2019/March-1)

Chandra centres for COSMOS X-ray galaxy groups: differences in stellar properties between central dominant and offset brightest group galaxies.

GOZALIASL G., FINOGUENOV A., TANAKA M., DOLAG K., MONTANARI F., KIRKPATRICK C.C., VARDOULAKI E., KHOSROSHAHI H.G., SALVATO M., LAIGLE C., McCRACKEN H.J., ILBERT O., CAPPELLUTI N., DADDI E., HASINGER G., CAPAK P., SCOVILLE N.Z., TOFT S., CIVANO F., GRIFFITHS R.E., BALOGH M., LI Y., AHORANTA J., MEI S., IOVINO A., HENRIQUES B.M.B. and ERFANIANFAR G.

Abstract (from CDS):

We present the results of a search for galaxy clusters and groups in the ∼2 deg² of the COSMOS field using all available X-ray observations from the XMM-Newton and Chandra observatories. We reach an X-ray flux limit of 3×10^–16 erg cm^–2 s^–1 in the 0.5-2 keV range, and identify 247 X-ray groups with M_ 200c_=8×10¹²-3×10¹⁴ M_☉ at a redshift range of 0.08 <= z < 1.53, using the multiband photometric redshift and the master spectroscopic redshift catalogues of the COSMOS. The X-ray centres of groups are determined using high-resolution Chandra imaging. We investigate the relations between the offset of the brightest group galaxies (BGGs) from halo X-ray centre and group properties and compare with predictions from semi-analytic models and hydrodynamical simulations. We find that BGG offset decreases with both increasing halo mass and decreasing redshift with no strong dependence on the X-ray flux and SNR. We show that the BGG offset decreases as a function of increasing magnitude gap with no considerable redshift-dependent trend. The stellar mass of BGGs in observations extends over a wider dynamic range compared to model predictions. At z < 0.5, the central dominant BGGs become more massive than those with large offsets by up to 0.3 dex, in agreement with model prediction. The observed and predicted log-normal scatter in the stellar mass of both low- and large-offset BGGs at fixed halo mass is ∼0.3 dex.

Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: groups: general - galaxies: statistics - galaxies: stellar content - X-rays: galaxies: clusters

VizieR on-line data: <Available at CDS (J/MNRAS/483/3545): table2.dat>

Nomenclature: Table 2: [GFT2019] Group NNNNN N=247 among (Nos 10006-30345).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NAME COSMOS Field	reg	10 00 28.60	+02 12 21.0						~	3639	0

Query : 2019MNRAS.483.3545G

Basic data :

NAME COSMOS Field -- Region defined in the Sky
Other object types:	`reg ()`
ICRS coord. (ep=J2000) :	`10 00 28.60 +02 12 21.0 [ ] D 2007ApJS..172..523M`
FK4 coord. (ep=B1950 eq=1950) :	`09 57 53.49 +02 26 47.1 [ ]`
Gal coord. (ep=J2000) :	`236.82224 +42.12163 [ ]`

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NAME COSMOS Field

References (3639 between 1850 and 2026) (Total 3639)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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