Multi-density model of the ionised gas in NGC 253 using radio recombination lines

Mohan, Niruj R. ; Goss, W. M. ; Anantharamaiah, K. R. (2005) Multi-density model of the ionised gas in NGC 253 using radio recombination lines Astronomy & Astrophysics, 432 (1). pp. 1-14. ISSN 0004-6361

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Official URL: http://www.aanda.org/articles/aa/abs/2005/10/aa148...

Related URL: http://dx.doi.org/10.1051/0004-6361:20041488

Abstract

We have imaged the H92α (8.3 GHz), H75α (15 GHz), and H166α (1.4 GHz) Radio Recombination Lines (RRLs) from NGC 253 at resolutions of 4.5 pc (0.4" ) , 2.5 pc (0.2" ) and 53 pc (4.5" ) respectively. The H92α line arises from individual compact sources, most of which possess radio continuum counterparts. The line widths range from ~200 km s -1 for the sources near the radio nucleus to 70-100 km s -1 for the extranuclear ones. These lines are emitted by gas at a density ~10 4 cm -3. The remainder of the cm-wave RRLs arise in lower density gas (~500 cm -3) with a higher area filling factor and with ten times higher mass. A third component of higher density gas ( >10 4 cm -3) is required to explain the mm-wave RRLs.

Item Type:Article
Source:Copyright of this article belongs to European Southern Observatory.
Keywords:Galaxies: Individual: NGC 253; Galaxies: ISM; Galaxies: Starburst; Radio Lines: Galaxies; Radio Lines: ISM
ID Code:27985
Deposited On:15 Dec 2010 18:09
Last Modified:11 May 2011 17:00

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