A sub-arcsecond study of ionized gas in NGC 253

Anantharamaiah, KR and Mohan, Niruj R and Goss, WM (2001) A sub-arcsecond study of ionized gas in NGC 253. In: IAU Symposium on Galaxies and their Constituents at the Highest Angular Resolutions, 15-18th August, 2000, pp. 400-403.

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Abstract

The nuclear region of the starburst galaxy NGC 253 was observed in $H92\alpha$ (8.3 GHz) and $H75\alpha$ (15.4 GHz) recombination lines at subarcsecond resolution using the A-configuration of the Very Large Array (VLA). In the highest resolution observations at 15.3 GHz, we have detected a compact (<5 pc), high density $(>5 \times 10^4 cm^{-3})$ ionized region which is nearly coincident with the radion continuum peak near the nucleus. Modelling of RRL emission from this region shows that about 1000 O stars are needed to maintain the iionization. Assuming the Salpeter initial mass function, the implied overall stellar density corresponds to that of a super star cluster.

Item Type:	Conference Paper
Publication:	Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium
Publisher:	International Astronomical Union
Additional Information:	Copyright of this article belongs to International Astronomical Union.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	08 Aug 2008
Last Modified:	19 Sep 2010 04:48
URI:	http://eprints.iisc.ac.in/id/eprint/15492

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