SHAMe-SF: Predicting the clustering of star-forming galaxies with an enhanced abundance matching model

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Volume 689 (September 2024)

A&A, 689 (2024) A66

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Table 3.

Definitions of the subhalo properties considered for the RF.

1. Mass proxies	M_sub	Current mass of the subhalo
	M_peak	Maximum value of M_sub through the evolution of the subhalo
	M_halo	Mass of the host halo (∼M_sub for centrals)
	V_max	Maximum value of the subhalo circular velocity, $V_{\max} = max (\sqrt{G M (< r) / r})$ $V_{\mathrm{max}} = \max(\sqrt{GM({ < }r)/r})$
	V_peak	Maximum value of V_max through the evolution of the subhalo

2. Time indicators	t_infall	Last time a subhalo was identified as a central
	a_Mpeak	Time when the subhalo reached its peak mass (M_peak)
	t_Vpeak	Time when the subhalo reached its peak V_max (V_peak)
	Age	Half-mass formation time of a subhalo
	Halo age	Half-mass formation time of the host halo

3. Accretion	Ṁ	Difference in M_sub between the current and the previous snapshot
	Ṁ_at peak	Difference in M_sub between t_Mpeak and its previous snapshot
	$\dot{V}$ $\dot{V}$	Difference in V_max between the current and the previous snapshot
	${\dot{V}}_{at peak}$ $\dot{V}_{\mathrm{at peak}}$	Difference in V_max between t_Vpeak and its previous snapshot

4. Environmental	Linear bias	Object-by-object bias (Paranjape et al. 2018; Paranjape & Alam 2020)
	α_peak	Local tidal anisotropy (Ramakrishnan et al. 2019; Zjupa et al. 2020)
	Central distance to halo	Distance to the central subhalo (0 for centrals)
	Min central dist to halo	Minimum value of the Central distance to halo through the evolution of
		the subhalo

5. Other properties	Angular momentum	Modulus of the halo angular momentum
& ratios	V_max/V_{200, t_infall}	Concentration proxy. Ratio between V_max and V_vir when each subhalo was
		last identified as a central
	V_peak/V_{vir (calculated from M_peak)}	Concentration proxy, calculated without the need of the full merger tree.
	⟨ν⟩_t	Integrated growth history (Chaves-Montero et al., in prep.)
	M_sub/M_halo	Ratio between the mass of the subhalo and its host halo
	M_sub/M_peak	Ratio between the current mass and the peak mass of a subhalo
	V_max/V_peak	Ratio between the peak mass and the current mass of a subhalo

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