The hot circumgalactic media of massive cluster satellites in the TNG-Cluster simulation: Existence and detectability

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Volume 686 (June 2024)

A&A, 686 (2024) A86

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Table 1.

Summary of the definitions and notation used throughout this work.

Name	Notation	Notes
Host halo size	$R_{200 c}^{host}$ $R_{\mathrm{200c}}^{\mathrm{host}}$ [Mpc]	Radius at which the average enclosed density is 200 times the critical density of the Universe.
Host halo mass	$M_{200 c}^{host} [M_{⊙}]$ $M_{\mathrm{200c}}^{\mathrm{host}}\,[M_\odot]$	Total mass enclosed within the halo size $R_{200 c}^{host}$ $R_{\mathrm{200c}}^{\mathrm{host}}$ .

Satellite stellar size	R_half, ⋆ [kpc]	Half mass radius of the total gravitationally bound stellar mass, computed via SUBFIND.
Satellite stellar mass	$M_{⋆}^{sat} [M_{⊙}]$ $M_{\star}^{\mathrm{sat}}\,[M_\odot]$	Stellar mass of the satellite galaxy within 2 R_half, ⋆.
Satellite gas mass	$M_{gas}^{sat} [M_{⊙}]$ $M_{\mathrm{gas}}^{\mathrm{sat}}\,[M_\odot]$	Total gravitationally bound gas mass, computed via SUBFIND.
Satellite hot gas mass	$M_{HotGas}^{sat} [M_{⊙}]$ $M_{\mathrm{HotGas}}^{\mathrm{sat}}\,[M_\odot]$	$M_{gas}^{sat}$ $M_{\mathrm{gas}}^{\mathrm{sat}}$ but only for hot > 10^4.5 K gas; used as a proxy for X-ray bright gas.
Satellite cold gas mass	$M_{ColdGas}^{sat} [M_{⊙}]$ $M_{\mathrm{ColdGas}}^{\mathrm{sat}}\,[M_\odot]$	$M_{gas}^{sat}$ $M_{\mathrm{gas}}^{\mathrm{sat}}$ but only for cold < 10^4.5 K gas; used as a proxy for ISM gas.
Satellite CGM gas mass	$M_{CGM}^{sat} [M_{⊙}]$ $M_{\mathrm{CGM}}^{\mathrm{sat}}\,[M_\odot]$	Circumgalactic medium; $M_{gas}^{sat}$ $M_{\mathrm{gas}}^{\mathrm{sat}}$ but only for > 2 R_half, ⋆ gas; includes hot and cold gas.

Host-centric distance	$d_{sat}^{host} [R_{200 c}^{host}, kpc]$ $d_{\mathrm{sat}}^{\mathrm{host}}\,[R_{\mathrm{200c}}^{\mathrm{host}},\mathrm{kpc}]$	Distance from the center of the host cluster to the center of the satellite, in 2D projection unless otherwise noted.

Infall time	τ_FirstInfall [Gyr]	The first time a galaxy became a satellite ^(a).

Notes.

^(a)

The first time the galaxy was a Friends-of-Friends satellite for at least 3 consecutive snapshots in a host of mass $M_{200 c}^{host} > 10^{12} M_{⊙}$ $M_{\mathrm{200c}}^{\mathrm{host}} > 10^{12}\,M_\odot$ .

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