Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.331..853t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 331, Issue 4, pp. 853-864.
Astronomy and Astrophysics
Astronomy
11
Dust, Extinction, Galaxies: Individual: Ngc 7465, Galaxies: Ism, Infrared: Ism, Submillimetre
Scientific paper
We present SCUBA 850-μm, JCMT CO(J =2->1), B -band imaging and VLA Hi observations of the NGC 7465/4/3 group of galaxies. The 850-μm emission associated with NGC 7465 extends to at least ~2R 25 and is well correlated with the Hi. We investigate a range of possible mechanisms by which dust beyond R 25 may be heated to give the observed extended submillimetre emission. By modelling the dust heating by stars in two extreme geometries, we fail to find any reasonable star formation scenario that is consistent with both the 850-μm and optical data. Furthermore, we do not detect any CO(J =2->1) emission coincident with the extended dust and atomic gas as would be expected if significant star formation were occurring. We show that shock-heating of dust via cloud-cloud collisions in the stripped interstellar medium of NGC 7465 could be sufficient to explain the extended 850-μm emission and lack of optical emission in the stripped gas, and suggest that cloud-cloud collisions may be an important dust heating mechanism in gas-rich systems.
Alexander Paul
Clemens M. S.
Dunne Loretta.
Eales Stephen
Green David A.
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