Retrieving the hot circumgalactic medium physics from the X-ray radial profile from eROSITA with an IlustrisTNG-based forward model

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Volume 703 (November 2025)

A&A, 703 (2025) A137

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Table 1.

Summary of the best-fit parameters (see Eqs. (1)–(3)) and derived quantities (luminosity values) obtained from fitting the three forward models from this work to the Full_phot X-ray surface brightness profile.

	Best-fit 𝒩_sat	f_sat	Best-fit 𝒩_ps	L_X, PS	L_{X, cenCGM}	χ_red²
	[10 $^{34} \frac{ergs}{s {kpc}^{2}}$ $^{34}\,\frac{\mathrm{ergs}}{\mathrm{s\,kpc^2}}$ ]	f_sat		$\frac{ergs}{s {kpc}^{2}}$ $\frac{\mathrm{ergs}}{\mathrm{s\,kpc^2}}$	[ergs/s]	χ_red²	[ergs/s]
Model 1	$2 . 75_{- 0.12}^{+ 0.12}$ $2.75_{-0.12}^{+0.12}$	0.31	$7 . 6_{- 1.6}^{+ 2.2} \times 10^{36}$ $7.6_{-1.6}^{+2.2}\times 10^{36}$	$7 . 851_{- 0.274}^{+ 0.028} \times 10^{39}$ $7.851_{-0.274}^{+0.028}\times 10^{39}$	$6 . 58_{- 0.94}^{+ 0.27} \times 10^{40}$ $6.58_{-0.94}^{+0.27}\times 10^{40}$	0.44
Model 2	$2 . 95_{- 0.13}^{+ 0.14}$ $2.95_{-0.13}^{+0.14}$	0.33	$1 . 1_{- 0.2}^{+ 0.2} \times 10^{37}$ $1.1_{-0.2}^{+0.2}\times 10^{37}$	$1 . 195_{- 0.042}^{+ 0.003} \times 10^{40}$ $1.195_{-0.042}^{+0.003}\times 10^{40}$	$2 . 76_{- 0.19}^{+ 0.06} \times 10^{40}$ $2.76_{-0.19}^{+0.06}\times 10^{40}$	1.32
Model 3	$1 . 51_{- 0.073}^{+ 0.07}$ $1.51_{-0.073}^{+0.07}$	0.56	$1 . 5_{- 0.2}^{+ 0.2} \times 10^{37}$ $1.5_{-0.2}^{+0.2}\times 10^{37}$	$1 . 576_{- 0.063}^{+ 0.001} \times 10^{40}$ $1.576_{-0.063}^{+0.001}\times 10^{40}$	$1 . 69_{- 0.91}^{+ 0.28} \times 10^{40}$ $1.69_{-0.91}^{+0.28}\times 10^{40}$	1.89

Notes. For every model, we present the best-fit 𝒩_sat: renormalization of the S_X, sat (of the TNG300-based prediction), f_sat: the fraction of satellites in the mock galaxy catalog (see descriptions of the mock catalogs in Sect. 3.3), 𝒩_ps: the normalization of the point-source component (see Eq. (2)), L_X, PS: the X-ray luminosity obtained by integrating the point source component, L_{X, cenCGM}: the X-ray luminosity obtained by integrating the central galaxies hot CGM component, χ_red²: the reduced χ² statistic for the model, obtained by using 21 − 2 degrees of freedom.

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