2003A&A...397..871P


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET11:34:41

2003A&A...397..871P - Astronomy and Astrophysics, volume 397, 871-881 (2003/1-3)

[C II] emission and star formation in late-type galaxies. II. A model.

PIERINI D., LEECH K.J. and VOELK H.J.

Abstract (from CDS):

We study the relationship between gas cooling via the [C II] (λ=158µm) line emission and dust cooling via the far-IR continuum emission on the global scale of a galaxy in normal (i.e. non-AGN dominated and non-starburst) late-type systems. It is known that the luminosity ratio of total gas and dust cooling, L_C II/LFIR_, shows a non-linear behaviour with the equivalent width of the H α (λ=6563Å) line emission, the ratio decreasing in galaxies of lower massive star-formation activity. This result holds despite the fact that known individual Galactic and extragalactic sources of the [C II] line emission show different [C II] line-to-far-IR continuum emission ratios. This non-linear behaviour is reproduced by a simple quantitative theoretical model of gas and dust heating from different stellar populations, assuming that the photoelectric effect on dust, induced by far-UV photons, is the dominant mechanism of gas heating in the general diffuse interstellar medium of the galaxies under investigation. According to the model, the global L_C II/LFIR_ provides a direct measure of the fractional amount of non-ionizing UV light in the interstellar radiation field and not of the efficiency of the photoelectric heating. The theory also defines a method to constrain the stellar initial mass function from measurements of L_C II_ and LFIR. A sample of 20 Virgo cluster galaxies observed in the [C II] line with the Long Wavelength Spectrometer on board the Infrared Space Observatory is used to illustrate the model. The limited statistics and the necessary assumptions behind the determination of the global [C II] luminosities from the spatially limited data do not allow us to establish definitive conclusions but data-sets available in the future will allow tests of both the reliability of the assumptions behind our model and the statistical significance of our results.

Abstract Copyright:

Journal keyword(s): galaxies: ISM - galaxies: spiral - galaxies: stellar content - infrared: galaxies - infrared: ISM - ISM: lines and bands

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 4178 H2G 12 12 46.443 +10 51 57.59   12.9       ~ 324 0
2 NGC 4189 GiG 12 13 47.278 +13 25 29.45   12.51 11.74     ~ 253 1
3 M 98 LIN 12 13 48.292 +14 54 01.69 11.25 10.95 10.14     ~ 451 1
4 NGC 4222 GiP 12 16 22.522 +13 18 25.46   13.86       ~ 178 1
5 NGC 4293 LIN 12 21 12.891 +18 22 56.64   11.6       ~ 257 2
6 NGC 4294 GiP 12 21 17.787 +11 30 39.99   12.6       ~ 265 0
7 NGC 4299 GiP 12 21 40.548 +11 29 59.74   12.8       ~ 226 0
8 NGC 4394 GiP 12 25 55.6370604801 +18 12 50.115665445   11.9       ~ 337 0
9 NGC 4402 GiP 12 26 07.566 +13 06 46.06   12.55       ~ 364 1
10 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5982 0
11 NGC 4429 GiG 12 27 26.5039638243 +11 06 27.581567094   11.4       ~ 287 0
12 NGC 4438 LIN 12 27 45.652 +13 00 30.92 11.37 11.02 10.17     ~ 586 3
13 NGC 4450 LIN 12 28 29.634 +17 05 05.82   10.90 10.08     ~ 516 1
14 NGC 4461 GiP 12 29 03.010 +13 11 01.88 12.56 12.09 11.19     ~ 221 2
15 NGC 4477 Sy2 12 30 02.172 +13 38 11.19 11.98 11.38 10.42     ~ 368 2
16 NGC 4491 GiG 12 30 57.1115841111 +11 29 00.712485343   13.50 12.55     ~ 142 1
17 NGC 4503 GiP 12 32 06.193 +11 10 35.16 12.66 12.05 11.07     ~ 205 1
18 NGC 4522 GiG 12 33 39.657 +09 10 29.54   13.6       ~ 334 0
19 M 90 Sy2 12 36 49.816 +13 09 46.33 10.56 10.26 9.54     ~ 810 1
20 M 58 SyG 12 37 43.597 +11 49 05.12 10.80 10.48 9.66     ~ 985 2
21 NGC 4596 GiP 12 39 55.9543662681 +10 10 34.181826559   12.4       ~ 339 0
22 NGC 4608 GiP 12 41 13.2831566199 +10 09 20.342721675   12.6       ~ 180 0
23 NGC 4647 H2G 12 43 32.542 +11 34 56.89   12.5 12.5     ~ 383 0
24 NGC 4654 GiP 12 43 56.638 +13 07 34.86   11.8       ~ 510 1
25 NGC 4698 Sy2 12 48 22.9112380605 +08 29 14.648866444   13.24 12.27     ~ 449 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-11:34:41

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