Spatially resolved [CII]–gas conversion factor in early galaxies

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Volume 700 (August 2025)

A&A, 700 (2025) A117

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Table 1.

Best-fit relations for spatially resolved and global [CII] conversion factors.

Y (best fit)	X₁	X₂ (if present)	A	B	C	σ	Eq.
Global relations

log α_[CII]	log Z	–	−0.39 ± 0.04	–	0.67 ± 0.06	0.14	[1]
log α_[CII]	log r_e, [CII]	–	0.69 ± 0.08	–	1.17 ± 0.04	0.21	[12]
log α_[CII]	logΣ_[CII],eff	–	−0.36 ± 0.06	–	3.7 ± 0.5	0.23	[13]

Spatially resolved relations

log W_[CII]	logΣ_[CII]	log Z	$- 0 . 355_{- 0.017}^{+ 0.003}$ $-0.355^{+0.003}_{-0.017}$	$- 0 . 324_{- 0.004}^{+ 0.048}$ $-0.324^{+0.048}_{-0.004}$	$3 . 37_{- 0.026}^{+ 0.191}$ $3.37^{+0.191}_{-0.026}$	0.18	[10]
log W_[CII]	logΣ_[CII]	–	−0.51 ± 0.001	–	4.93 ± 0.008	0.40	[11]

Notes. The fits follow the form Y = AX₁ + BX₂ + C (for two-variable fits) or Y = AX₁ + C (for single-variable fits). The units are as follows: α_[CII] in [ $M_{⊙} L_{⊙}^{- 1}$ $\mathrm{M_{\odot}\,L_{\odot}^{-1}}$ ], W_[CII] in [ $(M_{⊙} {kpc}^{- 2}) / (L_{⊙} {kpc}^{- 2})$ $(\rm M_{\odot}\,kpc^{-2})/(L_{\odot}\,kpc^{-2})$ ], Z in [Z_⊙], Σ_[CII] in [L_⊙ kpc⁻²], and r_e, [CII] in [kpc]. We include the 1σ dispersion of residuals around every best-fit relation. The last column lists the reference equation in the main text of the paper.

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