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

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

2004-10-27

arxiv.org/abs/astro-ph/0410676v3

Astronomy and Astrophysics

Astrophysics

Accepted by A&A; Changed to fit all figures within page

Scientific paper

10.1051/0004-6361:20041488

We have imaged the H92alpha (8.3 GHz), H75alpha (15 GHz), and H166alpha (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 H92alpha line arises from individual compact sources, most of which possess radio continuum counterparts. The line widths range from ~200 km/s for the sources near the radio nucleus to 70-100 km/s for the extranuclear ones. These lines are emitted by gas at a density ~10000 /cc. The remainder of the cm-wave RRLs arise in lower density gas (~500 /cc) with a higher area filling factor and with ten times highermass. A third component of higher density gas (>10000 /cc) is required to explain the mm-wave RRLs.

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