Astron. Astrophys. Suppl. Ser. 133, 61-70

The structure of atomic gas around the supernova remnant 3C 400.2

E.B. Giacani ¹ - G. Dubner ¹ - C. Cappa ² - J. Testori ³

Send offprint request: E. Giacani

1 - Instituto de Astronomía y Física del Espacio, CC 67, Suc. 28, 1428 - Buenos Aires, Argentina
e-mail: egiacani@iafe.uba.ar, gdubner@iafe.uba.ar
2 - Facultad de Ciencias Astronómicas y Geofísicas, UNLP, Argentina
e-mail: ccappa@fcaglp.fcaglp.unlp.edu.ar
3 - Instituto Argentino de Radioastronomía, Argentina
e-mail: jtestori@irma.edu.ar

Received April 7; accepted May 14, 1998

Abstract:

The interaction of the SNR 3C 400.2 with the interstellar medium is investigated on the basis of the HI observations using the Synthesis Radio Telescope at the Dominion Radio Astrophysical Observatory (DRAO). These new data show the existence of a dense atomic cloud associated with 3C 400.2 in the velocity range +14 to +42 km s^-1, and high velocity clouds probably accelerated by the supernova blast wave at v=-49.5 km s^-1  and +69 km s^-1. We propose that the complex remnant 3C 400.2 is the result of a supernova explosion in a region of the interstellar medium containing a density discontinuity. A breakout phenomenon may explain the observed morphology in the different spectral regimes.

Key words: supernova remnants (SNRs) -- supernova remnants: individual (3C 400.2) -- radio lines: ISM -- ISM: structure