The SRG/eROSITA All-Sky Survey - Constraints on AGN feedback in galaxy groups

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Volume 691 (November 2024)

A&A, 691 (2024) A188

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Table 4

Best-fit parameters of the S (r) – T relation.

Relation	A	B
	(keV cm²)
All groups (T = 0.73–2.68 keV, T_piv = 1.44 keV)

S (0.15r_500c) − T(r < r_500c)	$195_{- 2}^{+ 2}$ $195_{ - 2}^{ + 2}$	${0.86}_{- 0.06}^{+ 0.06}$ $0.86_{ - 0.06}^{ + 0.06}$
S (r_2500c) − T(r < r_500c)	$418_{- 7}^{+ 6}$ $418_{ - 7}^{ + 6}$	${0.70}_{- 0.07}^{+ 0.07}$ $0.70_{ - 0.07}^{ + 0.07}$
S(r_500c) − T(r < r_500c)	$618_{- 19}^{+ 16}$ $618_{ - 19}^{ + 16}$	${0.69}_{- 0.09}^{+ 0.09}$ $0.69_{ - 0.09}^{ + 0.09}$

Warm groups (T = 1.44–2.68 keV, T_piv = 1.79 keV)

S (0.15r_500c) − T(r < r_500c)	$235_{- 4}^{+ 4}$ $235_{ - 4}^{ + 4}$	${0.98}_{- 0.10}^{+ 0.10}$ $0.98_{ - 0.10}^{ + 0.10}$
S (r_2500c) − T(r < r_500c)	$485_{- 10}^{+ 9}$ $485_{ - 10}^{ + 9}$	${0.87}_{- 0.11}^{+ 0.11}$ $0.87_{ - 0.11}^{ + 0.11}$
S(r_500c) − T(r < r_500c)	$717_{- 26}^{+ 24}$ $717_{ - 26}^{ + 24}$	${0.72}_{- 0.17}^{+ 0.17}$ $0.72_{ - 0.17}^{ + 0.17}$

Cool groups (T = 0.73–1.44 keV, T_piv = 1.08 keV)

S (0.15r_500c) − T(r < r_500c)	$155_{- 4}^{+ 3}$ $155_{ - 4}^{ + 3}$	${0.59}_{- 0.16}^{+ 0.16}$ $0.59_{ - 0.16}^{ + 0.16}$
S (r_2500c) − T(r < r_500c)	$352_{- 13}^{+ 11}$ $352_{ - 13}^{ + 11}$	${0.32}_{- 0.22}^{+ 0.22}$ $0.32_{ - 0.22}^{ + 0.22}$
S(r_500c) − T(r < r_500c)	$504_{- 27}^{+ 21}$ $504_{ - 27}^{ + 21}$	${0.56}_{- 0.28}^{+ 0.28}$ $0.56_{ - 0.28}^{ + 0.28}$

Notes. The fitted relation is of the form S (r)E(z)^4/3 = A(T/T_piv)^B where the S (r) term stands for entropy measured at three characteristic radii (0.15r_500c, r_2500c, and r_500c), the T term stands for the characteristic temperature, T(r < r_500c), and T_piv is the pivot temperature value. The relation is fitted to the measurements presented in Table 3 by taking into account the statistical and systematic uncertainties. The fitting procedure is executed three times at each radius: first, for all the groups in the sample spanning a temperature range of 0.73–2.68 keV; second, for only the warm groups spanning a temperature range of 1.44-2.68 keV; and third, for only the cool groups spanning a temperature range of 0.73–1.44keV.

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