Cross-correlation between soft X-rays and galaxies - A new benchmark for galaxy evolution models

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Volume 697 (May 2025)

A&A, 697 (2025) A173

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Table 3.

Best-fit parameters obtained by fitting the HOD model on the galaxy auto-correlation functions.

Sample	Halo occupation distribution model					Deduced quantities
M₀^*	Best-fit parameters				$\frac{χ^{2}}{n d . o . f .}$ $\frac{\chi^2}{n\mathrm{d.o.f.}}$	Densities		f_sat	b	${log}_{10} ({\bar{M}}_{200 m})$ $\log_{10}(\bar{M}_{200m})$
	M_min	α_sat	σ_log(M)	ΔM₀		deg⁻²	10⁻⁵ Mpc⁻³	%		${\bar{M}}_{cen}$ $\bar{M}_{\mathrm{cen}}$	${\bar{M}}_{sat}$ $\bar{M}_{\mathrm{sat}}$
10	12.113 $_{- 0.257}^{+ 0.409}$ $_{-0.257}^{+0.409}$	1.184 $_{- 0.029}^{+ 0.059}$ $_{-0.029}^{+0.059}$	0.666 $_{- 0.236}^{+ 0.335}$ $_{-0.236}^{+0.335}$	0.052 $_{- 0.067}^{+ 0.182}$ $_{-0.067}^{+0.182}$	0.49	103.9	235.8	23.0	1.22	12.66	14.14
10.25	12.26 $_{- 0.276}^{+ 0.468}$ $_{-0.276}^{+0.468}$	1.178 $_{- 0.031}^{+ 0.062}$ $_{-0.031}^{+0.062}$	0.619 $_{- 0.303}^{+ 0.437}$ $_{-0.303}^{+0.437}$	0.014 $_{- 0.083}^{+ 0.204}$ $_{-0.083}^{+0.204}$	0.43	128.4	162.9	23.0	1.29	12.79	14.13
10.5	12.362 $_{- 0.23}^{+ 0.483}$ $_{-0.23}^{+0.483}$	1.163 $_{- 0.03}^{+ 0.063}$ $_{-0.03}^{+0.063}$	0.538 $_{- 0.312}^{+ 0.506}$ $_{-0.312}^{+0.506}$	0.016 $_{- 0.113}^{+ 0.208}$ $_{-0.113}^{+0.208}$	0.57	148.5	117.1	22.1	1.34	12.9	14.12
10.75	12.327 $_{- 0.047}^{+ 0.132}$ $_{-0.047}^{+0.132}$	1.091 $_{- 0.011}^{+ 0.023}$ $_{-0.011}^{+0.023}$	0.228 $_{- 0.09}^{+ 0.231}$ $_{-0.09}^{+0.231}$	0.031 $_{- 0.035}^{+ 0.056}$ $_{-0.035}^{+0.056}$	0.84	208.6	100.7	25.3	1.43	12.98	14.04
11	12.674 $_{- 0.039}^{+ 0.105}$ $_{-0.039}^{+0.105}$	1.131 $_{- 0.013}^{+ 0.026}$ $_{-0.013}^{+0.026}$	0.202 $_{- 0.072}^{+ 0.194}$ $_{-0.072}^{+0.194}$	0.018 $_{- 0.03}^{+ 0.046}$ $_{-0.03}^{+0.046}$	0.8	123.0	42.5	20.5	1.6	13.24	14.12
11.25	13.096 $_{- 0.03}^{+ 0.077}$ $_{-0.03}^{+0.077}$	1.159 $_{- 0.028}^{+ 0.053}$ $_{-0.028}^{+0.053}$	0.123 $_{- 0.082}^{+ 0.199}$ $_{-0.082}^{+0.199}$	0.036 $_{- 0.019}^{+ 0.031}$ $_{-0.019}^{+0.031}$	1.02	39.2	13.6	13.9	1.89	13.57	14.26
11.5	13.483 $_{- 0.021}^{+ 0.057}$ $_{-0.021}^{+0.057}$	1.261 $_{- 0.064}^{+ 0.119}$ $_{-0.064}^{+0.119}$	0.1 $_{- 0.062}^{+ 0.167}$ $_{-0.062}^{+0.167}$	0.002 $_{- 0.016}^{+ 0.031}$ $_{-0.016}^{+0.031}$	1.93	12.7	4.4	9.9	2.32	13.87	14.42

Notes. Best-fit parameters (with 1σ uncertainties) and deduced parameters obtained by fitting the HOD model on the galaxy auto-correlation functions (Fig. 2). The parameters are described in Sect. 4. The deduced quantities model densities of tracers, satellite fraction, large-scale halo bias, and mean halo mass hosting central and satellite galaxies are computed for the best-fit model.

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