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The Nature of the Dusty Ionized Gas in NGC 5846: (And Other Elliptical Galaxies ?)

Published online by Cambridge University Press:  25 May 2016

Paul Goudfrooij
Affiliation:
Space Telescope Science Institute, Baltimore, Maryland, USA
Ginevra Trinchieri
Affiliation:
Osservatorio Astronomico di Brera, Milano, Italy

Extract

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We present new optical imagery and ROSAT HRI X-ray imagery of the elliptical galaxy NGC 5846. A filamentary dust lane is detected in its central region, with a morphology strikingly similar to that observed for the optical nebulosity and the X-ray emission (cf. Fig. 1). A physical connection between the different phases of the interstellar medium therefore seems likely. The energy deposited from the hot gas into heating of the dust grains is consistent with the temperature distribution of the X-ray-emitting gas, which is found to be lowest in the dusty regions. The optical extinction of the dust is consistent with the Galactic extinction curve. We argue that the dust as well as the optical nebulosity are products of an interaction with a small, gas-rich galaxy, not remnants of a cooling flow. A full account of this work is currently in press in Astronomy and Astrophysics, and a preprint is available through http://www.stsci.edu/science/preprints/prep1191/prep1191.html.

Type
Mergers & Remnants
Copyright
Copyright © Kluwer 1999