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A Sub-arcsecond Study of Ionized Gas in NGC 253

Published online by Cambridge University Press:  13 May 2016

K.R. Anantharamaiah ,
Niruj R. Mohan  and
W.M. Goss
K.R. Anantharamaiah
Affiliation:
Raman Research Institute, Sadhashivanagar, Bangalore 560 080
Niruj R. Mohan
Affiliation:
†Dept. of Physics, Indian Institute of Science, Bangalore 560012, India
W.M. Goss
Affiliation:
NRAO, P.O. Box O, Socorro, NM 87801, USA

Abstract

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The nuclear region of the starburst galaxy NGC 253 was observed in H92α (8.3 GHz) and H75α (15.4 GHz) recombination lines at sub-arcsecond resolution using the A-configuration of the Very Large Array (VLA). In the highest resolution observations at 15.3 GHz, we have detected a compact (< 5 pc), high density (> 5 × 104 cm−3) ionized region which is nearly coincident with the radio continuum peak near the nucleus. Modeling of RRL emission from this region shows that about 1000 O stars are needed to maintain the ionization. Assuming the Salpeter initial mass function, the implied overall stellar density corresponds to that of a super star cluster.

Type
Supernovae, Pulsars, and the Interstellar Medium
Information
Symposium - International Astronomical Union , Volume 205: Galaxies and their Constituents at the Highest Angular Resolutions , 2001 , pp. 400 - 403
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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