2006A&A...446..877M


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.08CEST11:57:03

2006A&A...446..877M - Astronomy and Astrophysics, volume 446, 877-896 (2006/2-2)

ISM properties in low-metallicity environments. I. Mid-infrared spectra of dwarf galaxies.

MADDEN S.C., GALLIANO F., JONES A.P. and SAUVAGE M.

Abstract (from CDS):

We present new ISOCAM mid-infrared spectra of three starbursting nearby dwarf galaxies, NGC 1569, NGC 1140 and II Zw 40 and the 30 Dor region of the LMC and explore the properties of the ISM in low-metallicity environments, also using additional sources from the literature. We analyse the various components of the ISM probed by the mid-infrared observations and compare them with other Galactic and extragalactic objects. The MIR spectra of the low-metallicity starburst sources are dominated by the [NeIII]λ15.56µm and [SIV]λ10.51µm lines, as well as a steeply rising dust continuum. PAH bands are generaly faint, both locally and averaged over the full galaxy, in stark contrast to dustier starburst galaxies, where the PAH features are very prominant and even dominate on global scales. The hardness of the modeled interstellar radiation fields for the dwarf galaxies increases as the presence of PAH band emission becomes less pronounced. The [NeIII]/[NeII] ratios averaged over the full galaxy are strikingly high, often >10. Thus, the hard radiation fields are pronounced and pervasive. We find a prominent correlation between the PAHs/VSGs and the [NeIII]/[NeII] ratios for a wide range of objects, including the low metallicity galaxies as well as Galactic HII regions and other metal-rich galaxies. This effect is consistent with the hardness of the interstellar radiation field playing a major role in the destruction of PAHs in the low metallicity ISM. We see a PAHs/VSGs and metallicity correlation, also found by Engelbracht et al. ( 2005ApJ...628L..29E) for a larger survey. Combined effects of metallicity and radiation field seem to be playing important roles in the observed behavior of PAHs in the low metallicity systems.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: starburst - ISM: general - galaxies: ISM

Simbad objects: 19

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Number of rows : 19

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 [RLB93] SMC-B1 1 MoC 00 45 32.7 -73 18 46           ~ 33 0
2 SNR B0057-72.2 SNR 00 59 27.40 -72 10 10.7   12.37 12.57     ~ 216 0
3 NGC 1140 EmG 02 54 33.5258827369 -10 01 43.135585379 12.41 12.84 12.49 13.6 13.5 ~ 261 1
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5698 1
5 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1531 2
6 SBSG 0335-052 bCG 03 37 44.04 -05 02 38.5     16.65     ~ 433 1
7 NAME NGC 1569 CL* A Cl* 04 30 48.2 +64 50 59   15.45 15.22     ~ 97 1
8 NAME NGC 1569 CL* B Cl* 04 30 49.0 +64 50 53           ~ 70 0
9 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1150 3
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14874 1
11 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1742 1
12 RMC 136a Cl* 05 38 43.3 -69 06 08           ~ 142 2
13 UGCA 116 H2G 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 501 0
14 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5342 6
15 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3794 4
16 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2233 2
17 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1269 4
18 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1485 0
19 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2242 2

    Equat.    Gal    SGal    Ecl

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2020.08.08-11:57:04

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