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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
ISSN: 0004-6361
Alternative Location:
Copyright: (2005) by the European Southern Observatory (ESO).
Appears in Collections:Research Papers (A&A)

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