Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733733f&link_type=abstract
American Astronomical Society, AAS Meeting #217, #337.33; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new Hubble Space Telescope images of the remnant of SN 1885 (S And) in M31 taken using the 2% ACS/WFC ramp filter FR388N to isolate the remnant's Fe I 3720 line absorption. The filter's 100 Angstrom bandpass restricted the detection of Fe I line absorption to Fe-rich ejecta expanding with velocities +/-5000 km/s with respect to the plane of the sky. Comparisons with earlier ACS/WFC Ca I 4227 and Ca II 3934,3968 images taken in 2004 show a 0.1 arcsec displacement to the east of the Fe I absorption peak relative to the remnant's circular 0.8 arcsec diameter Ca II line absorption feature. While the off-center displacement of Fe I is in the same direction as seen in Ca I, the Fe I absorption feature is different in both size and structure and lies inside the outer Ca I absorption edge. We discuss various photoionization and SN Ia explosion model explanations for the observed Fe I off-center displacement from the remnant's geometric center.
This research was funded by NASA/HST GO program 11722.
Fesen Robert A.
Hamilton Andrew J. S.
Hoeflich Peter
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