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Title: Radio recombination lines from the starburst galaxy NGC 3256
Authors: Roy, A.L.
Goss, W.M.
Mohan, Niruj R.
Anantharamaiah, K.R.
Keywords: galaxies: individual: NGC 3256
galaxies: nuclei
radio lines: galaxies
Issue Date: Jun-2005
Publisher: EDP Sciences
Citation: Astronomy and Astrophysics, 2005, Vol.435, p831-837
Abstract: We have detected the radio recombination lines H91α and H92α with rest frequencies of 8.6 GHz and 8.3 GHz from the starburst nucleus NGC 3256 at an angular resolution of 16.4'' × 9.6'' using the Australia Telescope Compact Array and at an angular resolution of 12.0'' × 2.9'' using the VLA. The line was detected at ~1 mJy beam-1 peak with a width of 160 km s-1 with the ATCA and at ~0.5 mJy beam-1 peak with a width of 114 km s-1 with the VLA. Modelling the line emitting region as a collection of H II regions, we derive constraints on the required number of H II regions, their temperature, density, and distribution. We find that a collection of 10 to 300 H II regions with temperatures of 5000 K, densities of 1000 cm-3 to 5000 cm-3 and diameters of 15 pc produced good matches to the line and continuum emmission. The Lyman continuum production rate required to maintain the ionization is 2 × 1052~s-1 to 6 × 1053~s-1, which requires 600 to 17 000 O5 stars to be produced in the starburst.
ISSN: 0004-6361
Alternative Location:
Copyright: (2005) by the European Southern Observatory (ESO).
Appears in Collections:Research Papers (A&A)

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