2006ApJ...646..192J


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST14:01:14

2006ApJ...646..192J - Astrophys. J., 646, 192-204 (2006/July-3)

Hot dust and polycyclic aromatic hydrocarbon emission at low metallicity: a Spitzer survey of Local Group and other nearby dwarf galaxies.

JACKSON D.C., CANNON J.M., SKILLMAN E.D., LEE H., GEHRZ R.D., WOODWARD C.E. and POLOMSKI E.

Abstract (from CDS):

We present Spitzer 4.5 and 8.0 µm imaging of 15 Local Group and nearby dwarf galaxies. We find that the diffuse 8 µm emission is spatially correlated with regions of active star formation. Our sample spans a range of >1 dex in nebular metallicity and 3 orders of magnitude in current star formation rate, allowing us to examine the dependence of emission from hot dust and PAHs on these parameters. We detect prominent diffuse 8 µm emission from the four most luminous galaxies in the sample (IC 1613, IC 5152, NGC 55, and NGC 3109) and only very low surface brightness emission from four others (DDO 216, Sextans A, Sextans B, and WLM). These are the first spatially resolved images of diffuse 8 µm emission from such low-metallicity objects [12+log(O/H)∼7.5]. We observe correlations of this emission with the current star formation rate and the nebular metallicity of these galaxies. However, we also see evidence suggesting that other processes may also have a significant effect on the generation of this emission. These systems all have evidence for old and intermediate-age star formation; thus, the lack of diffuse 8 µm emission cannot be attributed to low galaxy ages. Also, winds cannot explain the paucity of this emission, since high-resolution imaging of the neutral gas in these objects shows no evidence of blowout. We propose that the lack of diffuse 8 µm emission in low-metallicity systems may be due to the destruction of dust grains by supernova shocks, assuming a long timescale to regrow dust. It is likely that the observed weak emission is at least partly due to a general absence of dust (including PAHs), in agreement with their low metallicities.

Abstract Copyright:

Journal keyword(s): ISM: Dust, Extinction - Galaxies: Dwarf - Galaxies: Irregular - Galaxies: ISM - Infrared: ISM - Galaxies: Local Group

Simbad objects: 33

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Number of rows : 33

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 [HM95] WLM 7 HII 00 01 56.3 -15 29 21           ~ 11 0
2 [HM95] WLM 9 HII 00 01 56.5 -15 26 52           ~ 10 0
3 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 555 2
4 EHR 2 HII 00 14 48.737 -39 14 57.84           ~ 4 0
5 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 685 2
6 EHR 1 HII 00 15 04.387 -39 10 58.13           ~ 3 0
7 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 351 0
8 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1079 2
9 [HLG90] 39 HII 01 05 01 +02 08.9           ~ 4 0
10 DDB IC 1613 1 SNR 01 05 02.70 +02 08 40.0           ~ 21 0
11 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 431 2
12 SBSG 0335-052 bCG 03 37 44.04 -05 02 38.5     16.65     ~ 420 1
13 NGC 1705 SBG 04 54 13.500 -53 21 39.82 12.32 12.96 12.56 12.58 12.9 ~ 579 1
14 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 535 0
15 NAME NGC 3109 Group GrG 09 59 35.2 -12 49 52           ~ 31 0
16 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 454 0
17 [BCP93] F1 H2 HII 10 02 58.9 -26 08 48           ~ 5 0
18 [BCP93] F1 H1 HII 10 02 59.8 -26 08 54           ~ 5 0
19 [BCP93] F1 H3 HII 10 03 01.3 -26 08 37           ~ 6 0
20 [RM92] HII 6 HII 10 03 03.6 -26 09 19           ~ 8 0
21 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 679 2
22 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 192 1
23 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 636 2
24 [HKS94] 17 HII 10 11 05.5 -04 42 39           ~ 5 0
25 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 433 0
26 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1405 0
27 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 382 1
28 IC 5152 G 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 216 1
29 [WLH83] IC 5152A HII 22 02 46.0 -51 17 38           ~ 3 0
30 ESO 407-18 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 138 0
31 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 408 1
32 NAME Local Group GrG ~ ~           ~ 6659 0
33 [OD99] H 5 PoG ~ ~           ~ 1 0

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2019.10.17-14:01:14

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