THE BLACK-HOLE CANDIDATE GRO J0422+32 - MEV EMISSION MEASURED WITH COMPTEL

被引：0
作者：
VANDIJK, R
BENNETT, K
COLLMAR, W
DIEHL, R
HERMSEN, W
LICHTI, GG
MCCONNELL, M
RYAN, J
SCHONFELDER, V
STRONG, A
VANPARADIJS, J
WINKLER, C
机构：
[1] MAX PLANCK INST EXTRATERR PHYS, D-85740 GARCHING, GERMANY
[2] UNIV NEW HAMPSHIRE, CTR SPACE SCI, DURHAM, NH 03824 USA
[3] UNIV AMSTERDAM, INST ASTRON, 1098 SJ AMSTERDAM, NETHERLANDS
[4] ESTEC, DIV ASTROPHYS, 2200 AG NOORDWIJK, NETHERLANDS
来源：
ASTRONOMY & ASTROPHYSICS | 1995年 / 296卷 / 02期
关键词：
GAMMA RAYS; OBSERVATIONS; BLACK-HOLE PHYSICS; BINARIES; GENERAL;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
On Aug. 5, 1992, BATSE detected the bright soft X-ray transient GRO J0422+32, also known as Nova Per 1992. The COMPTEL instrument (0.75-30 MeV) aboard the Compton Gamma-Ray Observatory (CGRO) observed this black-hole candidate twice. During the first observation, which started when the X-ray flux was at its maximum, GRO J0422+32 was detected between 1 and 2 MeV. The flux in this energy range was higher than expected from an extrapolation of the standard Sunyaev-Titarchuk Comptonisation model fits to the contemporaneous OSSE and SIGMA data. We discuss several models that may explain the total hard-X/gamma-ray spectrum, including the generalised Comptonisation model from Titarchuk. During the second observation, 3 weeks later, no evidence for emission above 1 MeV was seen.
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页码：L33 / L36
页数：4
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