G 32.1-0.9 - A new Galactic supernova remnant?

Details G 32.1-0.9 - A new Galactic supernova remnant? G 32.1-0.9 - A new Galactic supernova remnant?

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..365f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 365

Astronomy and Astrophysics

Astronomy

3

Supernova Remnants, X Ray Sources, Rosat Mission, Milky Way Galaxy, Metallicity, Signal To Noise Ratios, X Ray Spectra, Astronomical Models, X Ray Absorption, Radio Emission

Scientific paper

A low surface brightness X-ray source detected serendipitously in ROSAT observations of the Galactic plane near l of about 32 deg is probably a previously unknown Galactic SNR. The source, designated G 32.1-0.9, has an approximate angular size of 30 x 30 sq arcmin and an irregular X-ray morphology with brightening towards the center. The X-ray spectrum measured by both ROSAT and ASCA is well characterized by a thermal model with a temperature of about 0.8 keV and a subsolar metallicity (about 0.2). The measured soft X-ray absorption is equivalent to a column density N(H) of about 2.3 x 10 exp 21/sq cm, which is about one-quarter of the full Galactic N(H) in this direction, thus implying a Galactic origin for the source. The enhanced radio emission in the region of G 32.1-0.9 is plausibly interpreted as a low surface brightness partial radio shell. On the basis of the X-ray morphology and X-ray spectrum, coupled with the (albeit less secure) radio evidence, we conclude that G 32.1-0.9 is probably a new composite-type Galactic SNR.

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