Multi-density model of the ionised gas in NGC 253 using radio recombination lines
| dc.contributor.author | Mohan, Niruj R | |
| dc.contributor.author | Goss, W M | |
| dc.contributor.author | Anantharamaiah, K R | |
| dc.date.accessioned | 2006-12-29T10:56:48Z | |
| dc.date.available | 2006-12-29T10:56:48Z | |
| dc.date.issued | 2005-03 | |
| dc.description.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 | en |
| dc.format.extent | 761946 bytes | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.citation | Astronomy and Astrophysics, 2005, Vol.432, p1-14 | en |
| dc.identifier.issn | 0004-6361 | |
| dc.identifier.uri | http://hdl.handle.net/2289/1633 | |
| dc.language.iso | en | en |
| dc.publisher | EDP Sciences | en |
| dc.relation.uri | http://arxiv.org/abs/astro-ph/0410676 | en |
| dc.relation.uri | http://dx.doi.org/10.1051/0004-6361:20041488 | en |
| dc.rights | (2005) by the European Southern Observatory (ESO). | en |
| dc.subject | galaxies: individual: NGC 253 | en |
| dc.subject | galaxies: ISM | en |
| dc.subject | galaxies: starburst | en |
| dc.subject | radio lines: galaxies | en |
| dc.subject | radio lines: ISM | en |
| dc.title | Multi-density model of the ionised gas in NGC 253 using radio recombination lines | en |
| dc.type | Article | en |