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Radio Recombination Lines from the Starburst Galaxy NGC 3256 | | A.L. Roy
; W.M. Goss
; Niruj R. Mohan
; K.R. Anantharamaiah
; | | Date: |
22 Feb 2005 | | Subject: | astro-ph | | Abstract: | We have detected the radio recombination lines H91-alpha and H92-alpha with rest frequencies of 8.6 GHz and 8.3 GHz from the starburst nucleus NGC 3256 at an angular resolution of 16.4" x 9.6" using the Australia Telescope Compact Array and at an angular resolution of 12.0" x 2.9" using the VLA. The line was detected at ~ 1 mJy/beam peak with a width of 160 km/s with the ATCA and at ~ 0.5 mJy/beam peak with a width of 114 km/s with the VLA. Modelling the line emitting region as a collection of HII regions, we derive constraints on the required number of HII regions, their temperature, density, and distribution. We find that a collection of 10 to 300 HII 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 x 10^52 s^-1 to 6 x 10^53 s^-1, which requires 600 to 17000 O5 stars to be produced in the starburst. | | Source: | arXiv, astro-ph/0502448 | | Services: | Forum | Review | PDF | Favorites | |
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