Transition to the radiative phase in supernova remnants

被引:260
作者
Blondin, JM [1 ]
Wright, EB [1 ]
Borkowski, KJ [1 ]
Reynolds, SP [1 ]
机构
[1] N Carolina State Univ, Dept Phys, Raleigh, NC 27695 USA
关键词
hydrodynamics; instabilities; shock waves; supernova remnants;
D O I
10.1086/305708
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The evolution of a supernova remnant through the transition from an adiabatic Sedov-Taylor blast wave to a radiative pressure-driven snowplow phase is studied using one-and two-dimensional hydrodynamic simulations. This transition is marked by a catastrophic collapse of the postshock gas, forming a thin, dense shell behind the forward shock. After the transition, the shock front is characterized by a deceleration parameter, Vt/R approximate to 0.33, which is considerably higher than the analytic estimate of 2/7 for a pressure-driven snowplow. In two dimensions, the catastrophic collapse is accompanied by violent dynamical instabilities of the thin, cool shell. The violence of the collapse and the subsequent instability of the shell increase with increasing ambient density. Preshock density perturbations as small as 1% in an ambient medium with density of 100 cm(-3) can lead to distortions of the shock front larger than 10% of the radius of the remnant.
引用
收藏
页码:342 / 354
页数:13
相关论文
共 23 条
[1]   ABUNDANCES OF THE ELEMENTS - METEORITIC AND SOLAR [J].
ANDERS, E ;
GREVESSE, N .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1989, 53 (01) :197-214
[2]   ON THE STRUCTURE AND STABILITY OF RADIATIVE SHOCK-WAVES [J].
BERTSCHINGER, E .
ASTROPHYSICAL JOURNAL, 1986, 304 (01) :154-177
[3]  
Blondin J. M., 1996, New Astronomy, V1, P235, DOI 10.1016/S1384-1076(96)00019-X
[4]  
CHEVALIER RA, 1974, ASTROPHYS J, V188, P501, DOI 10.1086/152740
[5]   SELF-SIMILAR SOLUTIONS FOR THE INTERACTION OF STELLAR EJECTA WITH AN EXTERNAL MEDIUM [J].
CHEVALIER, RA .
ASTROPHYSICAL JOURNAL, 1982, 258 (02) :790-797
[6]   LINEAR-ANALYSIS OF AN OSCILLATORY INSTABILITY OF RADIATIVE SHOCK-WAVES [J].
CHEVALIER, RA ;
IMAMURA, JN .
ASTROPHYSICAL JOURNAL, 1982, 261 (02) :543-549
[7]   DYNAMICS OF RADIATIVE SUPERNOVA-REMNANTS [J].
CIOFFI, DF ;
MCKEE, CF ;
BERTSCHINGER, E .
ASTROPHYSICAL JOURNAL, 1988, 334 (01) :252-265
[8]   CATASTROPHIC COOLING IN SUPER-NOVA REMNANTS [J].
FALLE, SAEG .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1981, 195 (03) :1011-1028
[9]   H-ALPHA IMAGES OF THE CYGNUS LOOP - A NEW LOOK AT SHOCK-WAVE DYNAMICS IN AN OLD SUPERNOVA REMNANT [J].
FESEN, RA ;
KWITTER, KB ;
DOWNES, RA .
ASTRONOMICAL JOURNAL, 1992, 104 (02) :719-&
[10]   DYNAMIC-MODELS OF RADIATIVE SHOCKS .2. UNSTEADY SHOCKS [J].
INNES, DE ;
GIDDINGS, JR ;
FALLE, SAEG .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1987, 226 (01) :67-93