2025A&A...702A.175L

Query : 2025A&A...702A.175L

2025A&A...702A.175L - Astronomy and Astrophysics, volume 702A175 (2025/10-1)

X-ray flux-mass relation for z ≳ 0.7 galaxy clusters.

LYSKOVA N., CHURAZOV E., KHABIBULLIN I.I., SUNYAEV R., GILFANOV M. and SAZONOV S.

Abstract (from CDS):

We use a subsample of co-detections of the ACT and MaDCoWS cluster catalogs to verify the predicted relation between the observed X-ray flux FX in the 0.5-2 keV band and the cluster mass M500c for halos at z > 0.6 - 0.7. We modified this relation by introducing a correction coefficient, η, which is supposed to encapsulate factors associated with a particular method of flux estimation, the sample selection function, the definition of the cluster mass. We show that the X-ray flux, being the most basic X-ray observable, serves as a convenient and low-cost mass indicator for distant galaxy clusters with photometric or even missing redshifts (by setting z = 1) as long as it is known that z ≳ 0.6 - 0.7. The correction coefficient η is ≈0.8 if $ M^{\mathrm{UPP}}_{\mathrm{500c}} $ from the ACT-DR5 catalog are used as cluster masses, whereas η ≈ 1.1 if weak-lensing-calibrated masses $ M^{\mathrm{Cal}}_{\mathrm{500c}} $ are used instead.

Abstract Copyright: © The Authors 2025

Journal keyword(s): X-rays: galaxies: clusters

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 ACT-CL J0105.8-1839 ClG 01 05 50.54 -18 39 57.0           ~ 4 0

Query : 2025A&A...702A.175L

Basic data :
ACT-CL J0105.8-1839 -- Cluster of Galaxies
Other object types: otypes_help 		ClG (2019ApJS,ACT,...)
ICRS coord. (ep=J2000) : 		01 05 50.54 -18 39 57.0 (Infrared) [ ] E 2019ApJS..240...33G
FK4 coord. (ep=B1950 eq=1950) : 		01 03 23.11 -18 55 59.8 [ ]
Gal coord. (ep=J2000) : 		145.06442 -80.91231 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 170797 [20985] / z(photometric) 0.91 [0.07] / cz 272811 [20985]
   E 2019ApJS..240...33G
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Identifiers (2) :
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ACT-CL J0105.8-1839 MOO J0105-1839

References (4 between 1850 and 2026) (Total 4)
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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