Issue |
A&A
Volume 443, Number 2, November IV 2005
|
|
---|---|---|
Page(s) | 373 - 381 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361:20053227 | |
Published online | 04 November 2005 |
Extended very cold dust in the interacting HI ring galaxy pair NGC 2293 / 2292
1
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany e-mail: stickel@mpia.de
2
School of Physics, University of Melbourne, Victoria 3010, Australia
3
Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
Received:
12
April
2005
Accepted:
4
July
2005
The LGG 138 galaxy group members NGC 2292 and NGC 2293 were imaged
with ISOPHOT in the far-infrared (FIR) at ,
, and
. While no FIR emission is seen at
, and only very low level
emission is present at
, compact FIR emission
from both NGC 2292 and NGC 2293 galaxy centres and extended emission
likely associated with tidally removed dust and the HI ring
surrounding NGC 2292 / 2293 is strongly detected at
. Additionally, a compact FIR source
associated with the neighbouring galaxy NGC 2295 is strongly
detected at
. Remarkably, none of these three
galaxies have been detected individually in 21 cm HI emission. The
steeply rising far-infrared spectral energy distribution of the
apparently interacting NGC 2292 / 2293 pair towards longer
wavelengths indicates the thermal emission of very cold dust with a
temperature of 13 K, much lower than typical values of interacting
systems or even quiescent spiral galaxies. The FIR data of this
galaxy group clearly shows for the first time that there could be FIR
dust emission not accompanied by HI, that dust even in an interacting
system can have a very low dust temperature, and furthermore that
gravitational interaction can give rise to an extended diffuse dust
distribution.
Key words: galaxies: individual: NGC 2292 / galaxies: individual: NGC 2293 / galaxies: interactions / intergalactic medium / infrared: general / infrared: galaxies
© ESO, 2005
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