A remarkable ruby: Absorption in dense gas, rather than evolved stars, drives the extreme Balmer break of a little red dot at z = 3.5

Open Access

Table 1.

Emission line properties.

Line fluxes
Line	Flux (narrow)	Flux (broad)
	(10⁻¹⁸ erg s⁻¹ cm⁻²)	(10⁻¹⁸ erg s⁻¹ cm⁻²)
Hβ	$1 . 7_{- 1.2}^{+ 1.7}$ $1.7_{-1.2}^{+1.7}$	$3 . 8_{- 2.0}^{+ 1.6}$ $3.8_{-2.0}^{+1.6}$
[O III] _{λλ4960, 5008}	< 1.5
Hα (emission)	$13 . 0_{- 3.0}^{+ 4.8}$ $13.0_{-3.0}^{+4.8}$	$61 . 6_{- 2.0}^{+ 1.8}$ $61.6_{-2.0}^{+1.8}$
Hα (absorption)	$- 7 . 2_{- 5.1}^{+ 2.2}$ $-7.2_{-5.1}^{+2.2}$
O I_λ8446	< 0.5	< 0.9
Pa-δ	$0 . 13_{- 0.09}^{+ 0.16}$ $0.13_{-0.09}^{+0.16}$	$2 . 4_{- 0.4}^{+ 0.4}$ $2.4_{-0.4}^{+0.4}$
Pa-γ	$0 . 15_{- 0.11}^{+ 0.18}$ $0.15_{-0.11}^{+0.18}$	$5 . 2_{- 0.5}^{+ 0.4}$ $5.2_{-0.5}^{+0.4}$
He I_λ10830	$1 . 8_{- 0.3}^{+ 0.3}$ $1.8_{-0.3}^{+0.3}$	$0 . 9_{- 0.5}^{+ 0.5}$ $0.9_{-0.5}^{+0.5}$

Hα kinematic properties

z_narrow	$3 . 5484_{- 0.0004}^{+ 0.0004}$ $3.5484_{-0.0004}^{+0.0004}$
z_broad	$3 . 5470_{- 0.0003}^{+ 0.0003}$ $3.5470_{-0.0003}^{+0.0003}$
Δv_absorb	$49_{- 21}^{+ 26} {km s}^{- 1}$ $49^{+26}_{-21}\,{\mathrm{km\,s}^{-1}}$
FWHM_narrow	$478_{- 93}^{+ 95} {km s}^{- 1}$ $478^{+95}_{-93}\,{\mathrm{km\,s}^{-1}}$
FWHM_broad	$1533_{- 80}^{+ 110} {km s}^{- 1}$ $1533^{+110}_{-80}\,{\mathrm{km\,s}^{-1}}$
FWHM_absorb	$133_{- 92}^{+ 95} {km s}^{- 1}$ $133^{+95}_{-92}\,{\mathrm{km\,s}^{-1}}$

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