The Herschel Dwarf Galaxy Survey - I. Properties of the low-metallicity ISM from PACS spectroscopy

D. Cormier; S. C. Madden; V. Lebouteiller; N. Abel; S. Hony; F. Galliano; A. Rémy-Ruyer; F. Bigiel; M. Baes; A. Boselli; M. Chevance; A. Cooray; I. De Looze; V. Doublier; M. Galametz; T. Hughes; O. Ł. Karczewski; M.-Y. Lee; N. Lu; L. Spinoglio

doi:10.1051/0004-6361/201425207

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Volume 578 (June 2015)

A&A, 578 (2015) A53

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Table 1

Characteristics of the PACS FIR fine-structure cooling lines.

Species	λ	Transition	IP	ΔE/k ^a	n_crit
	[μm]		[eV]	[K]	[cm^-3]


[C ii]	157.7		11.3	91	50^b, 2.8 × 10³
[N ii]	121.9		14.5	188	310
[N ii]	205.2		14.5	70	48
[N iii]	57.3		29.6	251	3.0 × 10³
[O i]	63.2		–	228	4.7 × 10⁵
[O i]	145.5		–	327	9.5 × 10⁴
[O iii]	88.4		35.1	163	510

Notes. Values taken from Madden et al. (2013). The IP for [O ii] is 13.62 eV.

^(a)

Excitation temperature ΔE/k required to populate the transition level from the ground state.

^(b)

Critical density for collisions with electrons.

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