2004A&A...428..409B


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST15:38:41

2004A&A...428..409B - Astronomy and Astrophysics, volume 428, 409-423 (2004/12-3)

Mid-IR emission of galaxies in the Virgo cluster and in the Coma supercluster. IV. The nature of the dust heating sources.

BOSELLI A., LEQUEUX J. and GAVAZZI G.

Abstract (from CDS):

We study the relationship between the mid-IR (5-18µm) emission of late-type galaxies and various other star formation tracers in order to investigate the nature of the dust heating sources in this spectral domain. The analysis is carried out using a sample of 123 normal, late-type, nearby galaxies with available data at several frequencies. The mid-IR luminosity (normalized to the H-band luminosity) correlates better with the far-IR luminosity than with more direct tracers of the young stellar population such as the Hα and the UV luminosity. The comparison of resolved images reveals a remarkable similarity in the Hα and mid-IR morphologies, with prominent HII regions at both frequencies. The mid-IR images, however, show in addition a diffuse emission not associated with HII regions nor with the diffuse Hα emission. This evidence indicates that the stellar population responsible for the heating of dust emitting in the mid-IR is similar to that heating big grains emitting in the far-IR, including relatively evolved stars responsible for the non-ionizing radiation. The scatter in the mid-IR vs. Hα, UV and far-IR luminosity relation is mostly due to metallicity effects, with metal-poor objects having a lower mid-IR emission per unit star formation rate than metal-rich galaxies. Our analysis indicates that the mid-IR luminosity is not an optimal star formation tracer in normal, late-type galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: spiral - galaxies: ISM - stars: formation - infrared: ISM

Simbad objects: 24

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Number of rows : 24

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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2931 2
2 NGC 1140 EmG 02 54 33.5258827369 -10 01 43.135585379 12.41 12.84 12.49 13.6 13.5 ~ 261 1
3 SBSG 0335-052 bCG 03 37 44.04 -05 02 38.5     16.65     ~ 433 1
4 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1149 3
5 NGC 1808 Sy2 05 07 42.343 -37 30 46.98 11.05 10.80 9.94 9.36 10.2 ~ 650 3
6 UGCA 116 H2G 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 501 0
7 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5336 6
8 NAME COMA SUPERCL SCG 11 23 +23.9           ~ 235 0
9 NGC 4178 H2G 12 12 46.443 +10 51 57.59   12.9       ~ 319 0
10 M 98 LIN 12 13 48.292 +14 54 01.69 11.25 10.95 10.14     ~ 445 1
11 NGC 4394 GiP 12 25 55.6370604801 +18 12 50.115665445   11.9       ~ 333 0
12 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5825 0
13 NGC 4430 GiP 12 27 26.4014958744 +06 15 45.975179068   13.4       ~ 142 0
14 NGC 4450 LIN 12 28 29.634 +17 05 05.82   10.90 10.08     ~ 510 1
15 NGC 4532 GiP 12 34 19.329 +06 28 03.73   12.3       ~ 249 2
16 NGC 4535 H2G 12 34 20.310 +08 11 51.94   11.1       ~ 521 0
17 NGC 4567 GiP 12 36 32.701 +11 15 28.69 12.25 12.06 11.31     ~ 289 2
18 NGC 4568 GiP 12 36 34.292 +11 14 19.07   12.11 11.19     ~ 339 2
19 M 90 Sy2 12 36 49.816 +13 09 46.33 10.56 10.26 9.54     ~ 795 1
20 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 969 2
21 NGC 4647 H2G 12 43 32.542 +11 34 56.89   12.5 12.5     ~ 378 0
22 M 60 GiP 12 43 40.008 +11 33 09.40   10.3       ~ 1251 0
23 NGC 4654 GiP 12 43 56.638 +13 07 34.86   11.8       ~ 502 1
24 NGC 4689 H2G 12 47 45.5568267764 +13 45 46.148221803   12.8       ~ 333 0

    Equat.    Gal    SGal    Ecl

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2020.07.12-15:38:41

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