Shock waves in an inhomogeneous medium: H. cap alpha. emission of filaments in old supernova remnants

Journal Article · Mon Nov 01 04:00:00 EST 1976 · Sov. Astron. AJ (Engl. Transl.); (United States)

OSTI ID:7106599

Lozinskaya, T A; Ivanova, N P

The interaction between shock waves and irregularities in the interstellar medium affords a possible mechanism for producing optical filaments in decelerated supernova remnants. To test this model observationally, the integrated brightness distribution and internal velocity dispersion have been investigated for individual filaments in Simeiz 147 and VRO 42.05.01. Observations have been made in the H..cap alpha.. line with a high-contrast Fabry-Perot interferometer and a contact image tube. The velocity of the shock propagated into the cloud and experiencing radiative cooling is estimated to be 40--100 km/sec for both nebulae. The surface brightness of the ''secondary'' shock in the H..cap alpha.. line will be independent of the propagation velocity. The consistency of these results with the theory is discussed.

• Research Organization: Shternberg Astronomical Institute, Moscow
• OSTI ID: 7106599
• Journal Information: Sov. Astron. AJ (Engl. Transl.); (United States), Journal Name: Sov. Astron. AJ (Engl. Transl.); (United States) Vol. 2:6; ISSN SAAJA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADIABATIC PROCESSES
COSMIC GASES
COSMIC RADIO SOURCES
ELECTROMAGNETIC RADIATION
FLUIDS
GASES
IONIZING RADIATIONS
NEBULAE
PLASMA
RADIAL VELOCITY
RADIATIONS
SHOCK WAVES
SUPERNOVA REMNANTS
VELOCITY
X RADIATION