Title:	Multi-density model of the ionised gas in NGC 253 using radio recombination lines
Authors:	Mohan, Niruj R. Goss, W.M. Anantharamaiah, K.R.
Keywords:	galaxies: individual: NGC 253 galaxies: ISM galaxies: starburst radio lines: galaxies radio lines: ISM
Issue Date:	Mar-2005
Publisher:	EDP Sciences
Citation:	Astronomy and Astrophysics, 2005, Vol.432, p1-14
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 ~104 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 (〉104 cm-3) is required to explain the mm-wave RRLs. Appendix A is only available in electronic form at http://www.edpsciences.org
URI:	http://hdl.handle.net/2289/1633
ISSN:	0004-6361
Alternative Location:	http://arxiv.org/abs/astro-ph/0410676 http://dx.doi.org/10.1051/0004-6361:20041488
Copyright:	(2005) by the European Southern Observatory (ESO).
Appears in Collections:	Research Papers (A&A)

Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.