XMM-Newton follow-up of a sample of apparent low-surface-brightness galaxy groups detected in the ROSAT All-Sky Survey

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Table 2.

Summary of the galaxy group and cluster properties.

Galaxy group	RA (J2000)	Dec (J2000)	z_opt	z_assoc	z_{X − ray}	Redshift	k_BT	M₅₀₀	R₅₀₀	R₅₀₀	β	$F_{0.5 - 2.0 keV}^{‡}$ $F_{0.5{-}2.0\,\mathrm{keV}}^{\ddagger}$	$F_{0.1 - 2.4 keV}^{‡}$ $F_{0.1{-}2.4\,\mathrm{keV}}^{\ddagger}$
Galaxy group	[deg]	[deg]	z_opt	z_assoc	z_{X − ray}	adopted	[keV]	[10¹³ M_⊙]	[arcmin]	[kpc]	β	[ $10^{- 13} \frac{erg}{s cm}$ $10^{-13}\,{\frac{\mathrm{erg}}{\mathrm{s\,cm}}}$ ]	[ $10^{- 13} \frac{erg}{s cm}$ $10^{-13}\,{\frac{\mathrm{erg}}{\mathrm{s\,cm}}}$ ]
RXGCC 127 — z_X22 = 0.012


Group 1	45.977	−11.991	0.013 ± 0.002	0.012^a	$0 . 020_{- 0.008}^{+ 0.014}$ $0.020_{-0.008}^{+0.014}$	Opt	$0 . 84_{- 0.06}^{+ 0.06}$ $0.84^{+0.06}_{-0.06}$	$1 . 86_{- 0.25}^{+ 0.25}$ $1.86^{+0.25}_{-0.25}$	$25 . 15_{- 1.13}^{+ 1.15}$ $25.15^{+1.15}_{-1.13}$	$400 . 85_{- 18.08}^{+ 18.32}$ $400.85^{+18.32}_{-18.08}$	0.58 ± 0.03	4.37 ± 0.36	7.74 ± 0.63
Group 2	46.021	−12.103	0.102 ± 0.014	–	$0 . 111_{- 0.008}^{+ 0.013}$ $0.111_{-0.008}^{+0.013}$	X-ray	$2 . 80_{- 0.28}^{+ 0.30}$ $2.80_{-0.28}^{+0.30}$	$13 . 48_{- 2.31}^{+ 2.47}$ $13.48_{-2.31}^{+2.47}$	$6 . 20_{- 0.35}^{+ 0.38}$ $6.20_{-0.35}^{+0.38}$	$752 . 33_{- 42.95}^{+ 45.92}$ $752.33_{-42.95}^{+45.92}$	0.53 ± 0.03	3.81 ± 0.12	7.25 ± 0.23


RXGCC 841 — z_X22 = 0.016


AS0924	316.968	−47.178	0.032 ± 0.018	0.016^b	$0 . 027_{- 0.014}^{+ 0.022}$ $0.027_{-0.014}^{+0.022}$	Assoc	$1 . 04_{- 0.25}^{+ 0.30}$ $1.04^{+0.30}_{-0.25}$	$2 . 63_{- 1.07}^{+ 1.28}$ $2.63^{+1.28}_{-1.07}$	$23 . 01_{- 3.12}^{+ 3.73}$ $23.01_{-3.12}^{+3.73}$	$449 . 88_{- 61.00}^{+ 72.85}$ $449.88_{-61.00}^{+72.85}$	0.36 ± 0.02	1.02 ± 0.13	1.68 ± 0.22
A3742	316.699	−47.188	0.032 ± 0.018	0.018^c	Unconstr.	Assoc	–	–	–	–	–	–	–
A3745	316.925	−47.415	0.130 ± 0.003	–	Unconstr.	Opt	–	–	–	–	–	–	–
Group 3	316.768	−47.137	–	–	$0 . 235_{- 0.054}^{+ 0.048}$ $0.235_{-0.054}^{+0.048}$	X-ray	$1 . 62_{- 0.15}^{+ 0.35}$ $1.62_{-0.15}^{+0.35}$	$4 . 04_{- 0.74}^{+ 0.65}$ $4.04^{+0.65}_{-0.74}$	$2 . 15_{- 0.12}^{+ 0.12}$ $2.15_{-0.12}^{+0.12}$	$482 . 09_{- 27.50}^{+ 27.91}$ $482.09^{+27.91}_{-27.50}$	0.53 ± 0.05	0.38 ± 0.05	0.67 ± 0.09


RXGCC 104 — z_X22 = 0.036


Group 4	36.409	36.965	0.037 ± 0.004	0.036^a	$0 . 031_{- 0.003}^{+ 0.003}$ $0.031_{-0.003}^{+0.003}$	Assoc	$1 . 49_{- 0.05}^{+ 0.05}$ $1.49^{+0.05}_{-0.05}$	$4 . 77_{- 0.37}^{+ 0.37}$ $4.77^{+0.37}_{-0.37}$	$12 . 70_{- 0.33}^{+ 0.33}$ $12.70^{+0.33}_{-0.33}$	$545 . 32_{- 14.13}^{+ 14.00}$ $545.32^{+14.00}_{-14.13}$	0.39 ± 0.01	9.66 ± 0.47	17.43 ± 0.85
A0349	36.600	36.817	0.136 ± 0.017	–	$0 . 139_{- 0.009}^{+ 0.017}$ $0.139_{-0.009}^{+0.017}$	X-ray	–	–	–	–	–	–	–
[TKK2018] 859	36.387	37.148	0.037 ± 0.004	0.036^d	Unconstr.	Assoc	–	–	–	–	–	–	–

Notes. See Sect. 5 for details. ^‡XMM-Newton background-subtracted, unabsorbed fluxes. ^aX22, ^b Coziol et al. (2009), ^cESO 286-G049 in Smith et al. (2000), ^d Tempel et al. (2018).

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