The Discovery of a Spatially-Resolved Supernova Remnant in M31 with Chandra

Details The Discovery of a Spatially-Resolved Supernova Remnant in M31 with Chandra The Discovery of a Spatially-Resolved Supernova Remnant in M31 with Chandra

2002-10-17

arxiv.org/abs/astro-ph/0210408v1

Astrophys.J. 580 (2002) L125-L128

Astronomy and Astrophysics

Astrophysics

5 pages, 3 figures; accepted for publication in ApJL

Scientific paper

10.1086/345610

Chandra observations of M31 allow the first spatially resolved X-ray image of a supernova remnant (SNR) in an external spiral galaxy. CXOM31 J004327.7+411829 is a slightly elongated ring-shaped object with a diameter of ~11'' (42 pc). In addition, the X-ray image hints that the chemical composition of the SNR is spatial dependent. The X-ray spectrum of the SNR can be well fitted with a Raymond-Smith model or a non-equilibrium ionization model. Depending on the spectral model, the 0.3-7 keV luminosity is between 3.2x10^36 erg/s and 4.5x10^37 erg/s. The age of the SNR is estimated to be 3210-22300 years and the number density of ambient gas is ~0.003-0.3 cm^-3. This suggests that the local interstellar medium around the SNR is low.

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