Multi-frequency study of extragalactic supernova remnants and H II regions

Free access article

Issue		A&A Volume 425, Number 2, October II 2004


Page(s)		443 - 456
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20041058

A&A 425, 443-456 (2004)
DOI: 10.1051/0004-6361:20041058

Sculptor group Sd galaxy NGC 300

J. L. Payne¹, M. D. Filipovic^{2, 3}, T. G. Pannuti⁴, P. A. Jones³, N. Duric⁵, G. L. White¹ and S. Carpano⁶

¹ Centre for Astronomy, James Cook University, Townsville, QLD, 4811, Australia
e-mail: snova4@msn.com
² University of Western Sydney, Locked Bag 1797, Penrith South, DC, NSW, 1797, Australia
³ Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW, 1710, Australia
⁴ Spitzer Science Center, California Institute of Technology, Mailstop 220-6, Pasadena, CA 91125, USA
⁵ Department of Physics and Astronomy, University of New Mexico, 800 Yale Bd. N.E., Albuquerque, NM 87131, USA
⁶ Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany

(Received 8 April 2004 / Accepted 4 June 2004 )

Abstract
We present a multi-frequency study of supernova remnants (SNRs) and $\ion{H}{ii }$ regions in the nearby Sculptor Group Sd galaxy NGC 300, based on new ATCA observations at the wavelengths of 13 and 20 cm, XMM-Newton observations, newly-processed ROSAT (PSPC/HRI; Read & Pietsch 2001) and VLA (20/6 cm) images of this galaxy. We have investigated the physical properties at the X-ray and radio wavelengths of the 28 optical SNRs found by Blair & Long (1997) and have expanded on the multi-wavelength work by Pannuti et al. (2000) on this same galaxy. From a total of 54 radio sources and 11 X-ray sources, we report 18 SNRs and three (3) SNR candidates (classified by spectral index alone) in NGC 300. Five of these 18 SNRs are associated with reported optical SNRs and three have X-ray counterparts. An additional 12 radio SNRs are seen in the Blair & Long (1997) [S II] images. We also investigate the luminosity function of our SNRs. Three background radio sources are confirmed and 12 other sources could represent additional background objects. Twenty two radio correlations with OB associations within NGC 300 correspond to either $\ion{H}{ii }$ regions or SNRs making them a good tracer of SNRs near star-forming regions. Additionally, two radio sources coincide with potential globular clusters of NGC 300 reported by Kim et al. (2002).

Key words: galaxies: individual: NGC 300 -- ISM: supernova remnants -- radio continuum: galaxies -- X-rays: galaxies -- ISM: $\ion{H}{ii }$ regions

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