Hostname: page-component-586b7cd67f-vdxz6 Total loading time: 0 Render date: 2024-11-29T22:58:20.900Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Anantharamaiah, K.R. & Goss, W.M. 1996, ApJ, 466, L13.CrossRefGoogle Scholar
Anantharamaiah, K.R., Viallefond, F., Mohan, N.R., Goss, W.M., & Zhao, J.H. 2000, ApJ, 537, 613.CrossRefGoogle Scholar
Arnaboldi, M., Capaccioli, M., Cappellaro, E., Held, E.V., & Koribalski, B. 1995, AJ, 110, 119.CrossRefGoogle Scholar
Boker, T., Krabbe, A., & Storey, J.W.V. 1998, ApJ, 498, L115.CrossRefGoogle Scholar
Engelbracht, C.W., Rieke, M.J., Rieke, G.H., Kelly, D.M. & Achtermann, J.M. 1998, ApJ, 505, 639.CrossRefGoogle Scholar
Keto, E., Hora, J.L., Fazio, G.G., Hoffmann, W., & Deutsch, L. 1999, ApJ, 518, 183.CrossRefGoogle Scholar
Meurer, G.R., Heckman, T.M., Leitherer, C., Kinney, A., Robert, C., & Garnett, D.R., 1995, AJ, 110, 2665.CrossRefGoogle Scholar
Prada, F., Gutierrez, C.M., & McKeith, C.D. 1998, ApJ, 495, 765.CrossRefGoogle Scholar
Ulvestad, J.D. & Antonucci, R.R.J. 1997, ApJ, 488, 621.CrossRefGoogle Scholar
Vacca, W.D., Garmany, C.D., & Shull, J.M. 1996, ApJ, 460, 914.CrossRefGoogle Scholar
Watson, A.M., et al. 1996, AJ, 112, 534.CrossRefGoogle Scholar