Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...398..153m&link_type=abstract
Astronomy and Astrophysics, v.398, p.153-158 (2003)
Astronomy and Astrophysics
Astrophysics
3
Ism: General, Ism: Supernova Remnants, Ism: Individual Objects: G 73.9+0.9
Scientific paper
Flux calibrated images of the field around the known supernova remnant G 73.9+0.9 in the Hiα+[N Ii], [S Ii], [O Ii], and [O Iii] emission lines are presented. The low ionization images are characterized by diffuse emission both within and outside the extent of the remnant. The flux calibrated images revealed a few small scale structures in the east areas of G 73.9+0.9. The long-slit spectra identify the emission from one of them as emission from shock heated gas. This patchy structure is ˜ 3 arcmin long and emits Hα flux at a level of ˜33 × 10-17 erg s-1 cm-2 arcsec-2. The bright diffuse arc-like structure in the center of the field seems to be associated to G 73.9+0.9 given its spectral signature and positional relation with the non-thermal radio emission. A ˜8 arcmin long filamentary structure with an absolute Hα flux of ˜9 × 10-17 erg s-1 cm-2 arcsec-2 is detected in the [O Iii] emission line to the south of G 73.9+0.9 but is probably unrelated. The deep long-slit spectra suggest complete recombination zones, shock velocities below 90 km s-1, low electron densities (<50 cm-3) and non-negligible magnetic field strengths.
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