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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2005

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

W. M. Goss
  • Fonction : Auteur
K. R. Anantharamaiah
  • Fonction : Auteur

Résumé

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

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Dates et versions

hal-04111431 , version 1 (06-06-2023)

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Niruj R. Mohan, W. M. Goss, K. R. Anantharamaiah. Multi-density model of the ionised gas in NGC 253 using radio recombination lines. Astronomy and Astrophysics - A&A, 2005, 432, pp.1-14. ⟨10.1051/0004-6361:20041488⟩. ⟨hal-04111431⟩
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