Details

Autor(en) / Beteiligte

• Cormier, D
• Madden, S C
• Lebouteiller, V
• Abel, N
• Hony, S
• Galliano, F
• Remy-Ruyer, A
• Bigiel, F
• Baes, M
• Boselli, A

Titel

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

Ist Teil von

• Astronomy and astrophysics (Berlin), 2015-06, Vol.578, p.A53

Ort / Verlag

EDP Sciences

Erscheinungsjahr

2015

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The far-infrared (FIR) lines are important tracers of the cooling and physical conditions of the interstellar medium (ISM) and are rapidly becoming workhorse diagnostics for galaxies throughout the universe. Our goal is to explain the main differences and trends observed in the FIR line emission of dwarf galaxies compared to more metal-rich alaxies, and how this translates in ISM properties. We present Herschel/PACS spectroscopic observations of the [CII] 157 [mu]m, [OI] 63 and 145 [mu]m, [OIII] 88 [mu]m, [NII] 122 and 205 [mu]m, and [NIII] 57 [mu]m fine-structure cooling lines in a sample of 48 low-metallicity star-forming galaxies of the guaranteed time key program Dwarf Galaxy Survey. We correlate PACS line ratios and line-to-LTIR ratios with LTIR, LTIR/LB, metallicity, and FIR color, and interpret the observed trends in terms of ISM conditions and phase filling factors with Cloudy radiative transfer models.