Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aas...185.5004h&link_type=abstract
American Astronomical Society, 185th AAS Meeting, #50.04; Bulletin of the American Astronomical Society, Vol. 26, p.1393
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a 30 ksec ROSAT HRI X-ray image of the Galactic SNR G109.1--1.0 (CTB 109) together with new Hα and [O III] CCD images of the SNR's optical emission. The remnant's X-ray structure consists of several bright emission patches, numerous smaller-scale clumps and knots, and a faint, diffuse X-ray background. The remnant's bright, off-center X-ray blob is resolved into a triangular shaped region and several bright knots, five of which lie in a straight line that does not point towards the remnant's X-ray pulsar. Deep optical images reveal faint filaments near the SNR's geometrical center along the X-ray blob's SW edge. Low-dispersion optical spectra of these filaments show relative emission line strengths characteristic of shock-heated gas ([S II]/Hα = 0.85) with an estimated shock velocity ~ 100 km s(-1) . We suggest that the remnant's X-ray and optical emission structures, including the X-ray blob, are due to shocked cloud emissions resulting from the SNR's location at the outskirts of a molecular cloud complex. We also speculate that the peculiar chain of X-ray knots might be the clumpy, shock heated remains of an earlier epoch of mass outflow from a YSO embedded within the X-ray blob.
Fesen Robert A.
Hurford Alan P.
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