2009A&A...497..351C


Query : 2009A&A...497..351C

2009A&A...497..351C - Astronomy and Astrophysics, volume 497, 351-358 (2009/4-2)

Ionised carbon and galaxy activity.

CURRAN S.J.

Abstract (from CDS):

We investigate the possibility that the decrease in the relative luminosity of the 158µm [CII] line with the far-infrared luminosity in extragalactic sources stems from a stronger contribution from the heated dust emission in the more distant sources. Because these surveys are flux limited in nature, the luminosity of the detected objects increases with distance. However, the [CII] luminosity does not climb as steeply as that of the far-infrared, giving the decline in the L[CII]/LFIR ratio with LFIR. Investigating this further, we find that the [CII] luminosity exhibits similar drops as measured against the carbon monoxide and radio continuum luminosities. The former may indicate that at higher luminosities a larger fraction of the carbon is locked up in the form of molecules and/or that the CO line radiation also contributes to the cooling, done mainly by the [CII] line at low luminosities. The latter hints at increased activity in these galaxies at greater distances, so we suggest that, in addition to an underlying heating of the dust by a stellar population, there is also heating of the embedded dusty torus by the ultra-violet emission from the active nucleus, resulting in an excess in the far-infrared emission from the more luminous objects.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: ISM - galaxies: high-redshift - quasars: emission lines - cosmonology: observations

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1066 0
2 UGCA 39 GiG 02 41 55.092 +59 36 14.73   16       ~ 338 1
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6377 1
4 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1198 3
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16169 1
6 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1873 1
7 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1907 3
8 QSO J2322+1944 QSO 23 22 07.164 +19 44 22.98     18.29     ~ 72 0

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2022.08.19-04:53:03

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