High-Energy Astrophysics American and Soviet Perspectives/Proceedings from the U.S.-U.S.S.R. Workshop on High-Energy Astrophysics (1991) / Chapter Skim
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AXIALLY SYMMETRICAL SUPERNOVA REMNANTS
AXIALLY SYMMETRICAL SUPERNOVA REMNANTS
Pages 19-27
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From page 19... ...
~ Institute of Space Research 2Shternberg Astronomical Institute 3 Institute olSpace Research; Main Astrophysical O~ewatory, Ukranian Academy of Sciences 19
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Dense interstellar clouds and rarefied interstellar bubbles may affect the expanding shock fronts as well ~zinsl~ya 19863. Mass loss by a progenitor star leads to inhomogenei~ of circumstellar medium in two ways.
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From page 21... ...
At this distance from the galactic plane ambient gas is dominated by the diffuse component with a number density no < 0.1 cm~3. This estimation is close to the value O.O5cm~3, obtained in the X-ray model of Hamilton et al.
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~ O ~\ 121 Om 1 2h 08m 1 2h 06m 1 2h 04m Rl GHT ASCENSION (1950) FIGURE 1 lbe 843 MHz maps of G327.6 + 14.6(a)
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Anistropy of explosion implies inhomogeneous distribution of the surface density All of ejected material along the shell. We assume that at the onset of calculations aej = ~O(Asin2 ~ + Bsin)
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The configuration formed by an axisymmetncal explosion on the edge of the gas layer with density enhancement is presented in Figure ~ Initial parameters for this variant have been chosen as follows: ejected mass was equal to 2.0M<3, total energy of the explosion was 105i ergs with 85% in the form of kinetic energy; initial ratio of surface densities was ~p/ae = 0.1; initial radius was 0.7 pa, parameters A and B from formula (3) were A = 0.g7, B = 0.03.
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From page 25... ...
Our calculations have shown that it is impossible to obtain the observed shape and surface density distribution for the explosion in the uniform media using only the asymmetry of the explosion. The observed shape with two extended radioarcs lay rather strong restrictions on the possible gas distribution in the vicinity of the explosion.
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From page 26... ...
The radius of the tunnel Is equal to Ro = 10 pc in the symmetry plane Z = ~ and increases with characteristic scale Rc = 20 pc for larger A, and the point of the explosion is shifted up from the summery plane by Zc = 7,5 pc. The initial energy of the explosion is equal to 105i ergs with 75% in the form of ldnetic energy and the mass ejected in the explosion is equal lo 2.5M~.
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From page 27... ...
CONCLUSIONS 1. The supernova remnants with axial symmetry may be formed by anisotropic supernova explosions with most of ejecta confined to an equatorial plane as well as a result of the explosions in nonuniform media.
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