Predicting the resolved CO emission of z = 1−3 star-forming galaxies

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Volume 699 (July 2025)

A&A, 699 (2025) A19

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Table 1

Size ratios and H₂ fraction.

Quantity	z = 0.8–1.2	z = 1.8–2.2	z = 2.5–3.5
^a r_{1/2,CO(3–2)}/r_{1/2,CO(1–0)}	${0.96}_{- 0.06}^{+ 0.04}$ $0.96_{ - 0.06}^{ + 0.04}$	${0.96}_{- 0.06}^{+ 0.03}$ $0.96_{ - 0.06}^{ + 0.03}$	${0.97}_{- 0.06}^{+ 0.03}$ $0.97_{ - 0.06}^{ + 0.03}$
^b r_{1/2,CO(5–4)}/r_{1/2,CO(1–0)}	${0.93}_{- 0.12}^{+ 0.08}$ $0.93_{ - 0.12}^{ + 0.08}$	${0.93}_{- 0.11}^{+ 0.06}$ $0.93_{ - 0.11}^{ + 0.06}$	${0.95}_{- 0.11}^{+ 0.05}$ $0.95_{ - 0.11}^{ + 0.05}$
$^{c} r_{1 / 2, CO (1 - 0)} / r_{1 / 2, H_{2}}$ $^c{{\rm{r}}_{1/2,{\rm{CO}}(1 - 0)}}/{{\rm{r}}_{1/2,{{\rm{H}}_2}}}$	${0.69}_{- 0.21}^{+ 0.15}$ $0.69_{ - 0.21}^{ + 0.15}$	${0.72}_{- 0.18}^{+ 0.14}$ $0.72_{ - 0.18}^{ + 0.14}$	${0.74}_{- 0.2}^{+ 0.1}$ $0.74_{ - 0.2}^{ + 0.1}$
^d H₂ fraction at r <= 2r_{1/2,CO(1–0)}	${0.7}_{- 0.2}^{+ 0.2}$ $0.7_{ - 0.2}^{ + 0.2}$	${0.72}_{- 0.19}^{+ 0.17}$ $0.72_{ - 0.19}^{ + 0.17}$	${0.7}_{- 0.19}^{+ 0.17}$ $0.7_{ - 0.19}^{ + 0.17}$

Notes. ^(a)CO(3–2) half-light to CO(1–0) half-light radii ratio, ^(b)CO(5– 4) half-light to CO(1–0) half-light radii ratio, ^(c)CO(1–0) half-light to H₂ half-mass radii ratio ^(d)H₂ mass fraction within twice the CO(1– 0) half-light radius, for galaxies in three redshift bins. The median values are shown here as well as the 16th and 84th percentiles as sub/super-scripts respectively.

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