Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110..747f&link_type=abstract
Astronomical Journal v.110, p.747
Astronomy and Astrophysics
Astronomy
22
Supernova Remnants, Ism Structure
Scientific paper
Hα and [O III] images of the galactic SNR G109. 1-1.0 plus optical spectra of five associated emission filaments and two neighboring H II regions are presented. These data show the remnant's optical filaments are more extensive and have a larger diffuse component than previously realized. New filamentary emission is also detected near U109. 1-1.0's projected center, along the SW edge of the remnant's bright x-ray blob. Balmer decrements for five filaments indicate significant variations in optical reddening, E(B - V) =0.79- 1.2 mag, on both large and small spatial scales. [S II] λ6716/λ6731 line ratios indicate filament electron densities of ≤100-800 cm-3, with the high end of this range implying preshock densities ≃20. These relatively high densities, together with the tendency of the remnant's optical emission to lie along the boundaries of faint H II regions to the north and southeast, suggest that much of G109.1-1.0's optical emission may be the result of its interaction with these H II regions.
Fesen Robert A.
Hurford Alan P.
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