Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.1212t&link_type=abstract
The Astronomical Journal, Volume 116, Issue 3, pp. 1212-1220.
Astronomy and Astrophysics
Astronomy
77
Galaxies: Dwarf, Galaxies: Evolution, Galaxies: Individual: Ngc Number: Ngc 5253, Galaxies: Ism, Galaxies: Starburst
Scientific paper
We present VLA images of the radio continuum emission of the starburst in NGC 5253 at wavelengths of 6, 3.6, and 2 cm, with resolutions of 1"-2", and at 20 cm with resolution of ~9". A spectral index map constructed from the 6 and 2 cm images indicates that thermal free-free emission from ionized gas, most of it from a single source, dominates the radio emission. The unusually high fraction of free-free emission suggests that the starburst is very young. Regions of diffuse nonthermal synchrotron emission and probable supernova remnants surround the central radio source. We detect several regions of rising spectral index in NGC 5253, suggesting that the free-free emission is optically thick at 2 cm. These nebulae are situated to the north of the central cluster/main radio source. The turnover frequencies require an emission measure (EM) ~ 10^8-10^9 cm^-6 pc, and
Beck Sara C.
Ho Paul T. P.
Turner Jean L.
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