Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...485..143p&link_type=abstract
Astrophysical Journal v.485, p.143
Astronomy and Astrophysics
Astronomy
14
Galaxies: Individual Ngc Number: Ngc 253, Galaxies: Starburst, Radio Lines: Galaxies
Scientific paper
The millimeter-wavelength hydrogen recombination lines H40 alpha , H53 alpha , and H66 alpha have been observed in the nucleus of the nearby starburst galaxy NGC 253. The line fluxes have been compared with existing radio recombination line measurements and are found to be consistent with spontaneous emission from optically thin H II regions. The inferred hydrogen ionization rate is (3.7 +/- 0.8) x 1053 s-1. This value is up to an order of magnitude larger than those inferred from the recombination lines Br gamma and Br alpha , implying substantial extinction due to dust even at near-infrared wavelengths. Comparison with existing 3.3 mm continuum measurements implies an electron temperature for the gas of (5000 +/- 900) K if the continuum at this wavelength is entirely due to free-free emission.
Brand Peter W. J. L.
Moore Justin Tatch
Mountain Charles M.
Nakai Noriyuki
Puxley Phil J.
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