Supernova remnant IC 443 - Fast filaments and high-velocity gas

Details Supernova remnant IC 443 - Fast filaments and high-velocity gas Supernova remnant IC 443 - Fast filaments and high-velocity gas

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....71...29l&link_type=abstract

Astronomy and Astrophysics, vol. 71, no. 1-2, Jan. 1979, p. 29-35.

Astronomy and Astrophysics

Astrophysics

12

H Alpha Line, Interstellar Matter, Interstellar Radiation, Radial Velocity, Supernova Remnants, Fabry-Perot Interferometers, Flow Velocity, Gas Flow, Velocity Distribution

Scientific paper

Results are reported for interferometric H-alpha observations of the old supernova remnant IC 443, which were performed with a high-contrast Fabry-Perot etalon and a contact image converter attached to the Cassegrain foci of 50-, 125-, and 260-cm reflectors. The radial velocities of the fastest filaments in the bright NE part of the remnant and the expansion velocities of the faint SW filamentary system are found to range from -220 to plus 220 km/s (LSR). A search for high-velocity gas reveals the presence of low-surface-brightness amorphous H-alpha emission from gas with velocities of -350 to plus 240 km/s in the bright NE sector of the remnant. The observations are shown to be in good agreement with a model of blast-wave propagation in the interstellar medium with both a strong large-scale density gradient and small-scale density fluctuations. A radial-velocity distribution for the filaments is derived which implies an egg-shaped shell with the major axis normal to the line of sight, a density-gradient scale height of 7 pc, and a postshock gas velocity of 280 km/s.

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