2010A&A...518L..57C


Query : 2010A&A...518L..57C

2010A&A...518L..57C - Astronomy and Astrophysics, volume 518, L57-57 (2010/7-2)

The effects of star formation on the low-metallicity ISM: NGC 4214 mapped with Herschel/PACS spectroscopy.

CORMIER D., MADDEN S.C., HONY S., CONTURSI A., POGLITSCH A., GALLIANO F., STURM E., DOUBLIER V., FEUCHTGRUBER H., GALAMETZ M., GEIS N., DE JONG J., OKUMURA K., PANUZZO P. and SAUVAGE M.

Abstract (from CDS):

We present Herschel/PACS spectroscopic maps of the dwarf galaxy NC4214 observed in 6 far infrared fine-structure lines: [CII] 158µm, [OIII] 88µm, [OI] 63µm, [OI] 146µm, [NII] 122µm, and [NII] 205µm. The maps are sampled to the full telescope spatial resolution and reveal unprecedented detail on ∼150pc size scales. We detect [CII] emission over the whole mapped area, [OIII] being the most luminous FIR line. The ratio of [OIII]/[CII] peaks at about 2 toward the sites of massive star formation, higher than ratios seen in dusty starburst galaxies. The [CII]/CO ratios are 20000 to 70000 toward the 2 massive clusters, which are at least an order of magnitude larger than spiral or dusty starbursts, and cannot be reconciled with single-slab PDR models. Toward the 2 massive star-forming regions, we find that L[CII] is 0.5 to 0.8% of the LTIR. All of the lines together contribute up to 2% of LTIR. These extreme findings are a consequence of the lower metallicity and young, massive-star formation commonly found in dwarf galaxies. These conditions promote large-scale photodissociation into the molecular reservoir, which is evident in the FIR line ratios. This illustrates the necessity to move to multiphase models applicable to star-forming clusters or galaxies as a whole.

Abstract Copyright:

Journal keyword(s): galaxies: ISM - galaxies: individual: NGC 4214 - ISM: line and bands - photon-dominated region (PDR) - galaxies: dwarf galaxies

Nomenclature: Fig. 2, Table 1: [CMH2010] NGC 4214-R (Nos I-III).

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16509 1
2 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1908 1
3 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5677 6
4 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 928 1
5 NAME NGC 4214-I HII 12 15 39.686 +36 19 34.12           ~ 15 0
6 NAME NGC 4214-II HII 12 15 40.7900 +36 19 09.260           ~ 15 0
7 NAME Local Group GrG ~ ~           ~ 7893 0

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2023.01.31-02:26:38

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