Extended dust emission in NGC 7465

Thomas, H. C., Dunne, Loretta, Clemens, M. S., Alexander, P., Eales, Stephen Anthony ORCID: https://orcid.org/0000-0002-7394-426X, Green, D. A. and James, A. 2002. Extended dust emission in NGC 7465. Monthly Notices of the Royal Astronomical Society 331 (4) , pp. 853-864. 10.1046/j.1365-8711.2002.05192.x

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Abstract

We present SCUBA 850-μm, JCMT CO(J=2→1), B-band imaging and VLA H i observations of the NGC 7465/4/3 group of galaxies. The 850-μm emission associated with NGC 7465 extends to at least ∼2R25 and is well correlated with the H i. We investigate a range of possible mechanisms by which dust beyond R25 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	dust; extinction; NGC 7465; infrared ISM; submillimetre
Publisher:	Wiley-Blackwell
ISSN:	0035-8711
Last Modified:	24 Oct 2022 11:07
URI:	https://orca.cardiff.ac.uk/id/eprint/47010

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