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Title:
G 32.1-0.9 - A new Galactic supernova remnant?
Authors:
Folgheraiter, E. L.; Warwick, R. S.; Watson, M. G.; Koyama, K.
Affiliation:
AA(Leicester, Univ.), AB(Leicester, Univ.), AC(Leicester, Univ.), AD(Kyoto Univ.)
Publication:
Royal Astronomical Society, Monthly Notices, vol. 292, p. 365 (MNRAS Homepage)
Publication Date:
12/1997
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
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
Bibliographic Code:
1997MNRAS.292..365F

Abstract

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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