Portrait of a Galaxy on FIRE: Exploring α-bimodality as a consequence of inside-out disc growth in a hierarchical formation scenario

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Volume 709 (May 2026)

A&A, 709 (2026) A131

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Table 1

Global properties of the Romeo simulated galaxy at z ∼ 0.1, just before the start of its bar episode, and at z = 0, compared with those of the MW.

	z	$\begin{matrix} M_{200}^{DM} \\ [10^{11} M_{⊙}] \end{matrix}$ $Mathematical equation: $\matrix{ {M_{200}^{{\rm{DM}}}} \cr {[{{10}^{11}}{{\rm{M}}_ \odot }]} \cr } $$	R_200,c [kpc]	M_gas [10¹⁰ M_⊙]	M∗ [10¹⁰ M_⊙]
Romeo	0.0998	9.2	200	8.4	7.4
Romeo	0	9.4	206	8.3	8.0
MW	0	${8.3}_{- 0.9}^{+ 1.0}$ $Mathematical equation: $8.3_{ - 0.9}^{ + 1.0}$$	193 ± 7	∼5	5 ± 1

Notes. The virial radius, R_200,c, is defined as the radius of the sphere in which the average DM density equals 200 times the critical density of the universe at given z. The masses $M_{200}^{DM}$ $Mathematical equation: $M_{200}^{{\rm{DM}}}$$ , M_gas, and M_∗ are the DM, gas, and stellar masses enclosed within that sphere. The DM, gas, and stellar mass point estimates, with corresponding 1σ uncertainties, of the MW are taken from Karukes et al. (2020), Miller & Bregman (2015), and Bland-Hawthorn & Gerhard (2016), respectively.

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