Deceleration in the expansion of SN 1993J

被引：57

作者：

Marcaide, JM

Alberdi, A

Ros, E

Diamond, P

Shapiro, II

Guirado, JC

Jones, DL

Mantovani, F

PerezTorres, MA

Preston, RA

Schilizzi, RT

Sramek, RA

Trigilio, C

VanDyk, SD

Weiler, KW

Whitney, AR

机构：

[1] INST NACL TECNICA AEROESPACIAL,LAB ASTROFIS ESPACIAL & FIS FUNDAMENTAL,MADRID 28080,SPAIN

[2] CSIC,INST ASTROFIS ANDALUCIA,E-18080 GRANADA,SPAIN

[3] NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801

[4] HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138

[5] CALTECH,JET PROP LAB,PASADENA,CA 91109

[6] CNR,IST RADIOASTRON,I-40129 BOLOGNA,ITALY

[7] JOINT INST VLBI EUROPE,NL-7990 AA DWINGELOO,NETHERLANDS

[8] LEIDEN OBSERV,NL-2300 RA LEIDEN,NETHERLANDS

[9] CNR,IST RADIOASTRON,I-96017 NOTO,ITALY

[10] USN,RES LAB,REMOTE SENSING DIV,COD 7214,WASHINGTON,DC 20375

[11] MIT,HAYSTACK OBSERV,WESTFORD,MA 01886

来源：

ASTROPHYSICAL JOURNAL | 1997年 / 486卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

circumstellar matter; galaxies; individual; (NGC; 3031; M81); radio continuum; stars; supernovae; (SN; 19935); techniques; interferometric;

D O I：

10.1086/310830

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A rarity among supernova, SN 1993J in M81 can be studied with high spatial resolution. Its radio power and distance permit VLBI observations to monitor the expansion of its angular structure. This radio structure was previously revealed to be shell-like and to be undergoing a self-similar expansion at a constant rate. From VLBI observations at wavelengths of 3.6 and 6 cm in the period 6-42 months after explosion, we have discovered that the expansion is decelerating. Our measurement of this deceleration yields estimates of the density profiles of the supernova ejecta and circumstellar material in standard supernova explosion models.

引用

页码：L31 / &

页数：5

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