HIGH-ENERGY GAMMA-RADIATION FROM GEMINGA OBSERVED BY EGRET

被引：65

作者：

MAYERHASSELWANDER, HA

BERTSCH, DL

BRAZIER, KTS

CHIANG, J

FICHTEL, CE

FIERRO, JM

HARTMAN, RC

HUNTER, SD

KANBACH, G

KWOK, PW

KNIFFEN, DA

LIN, YC

MATTOX, JR

MICHELSON, PF

NOLAN, PL

PINKAU, K

ROTHERMEL, H

SCHNEID, EJ

SOMMER, M

SREEKUMAR, P

THOMPSON, DJ

VONMONTIGNY, C

机构：

[1] NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771

[2] STANFORD UNIV,WW HANSEN EXPTL PHYS LAB,STANFORD,CA 94305

[3] STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305

[4] NASA,GSFC,POSTDOCTORAL RES ASSOCIATE,NRC,NAS,GREENBELT,MD 20771

[5] HAMPDEN SYDNEY COLL,DEPT PHYS & ASTRON,HAMPDEN SYDNEY,VA 23943

[6] GRUMMAN AEROSP CORP,BETHPAGE,NY 11714

[7] USRA,WASHINGTON,DC

来源：

ASTROPHYSICAL JOURNAL | 1994年 / 421卷 / 01期

关键词：

GAMMA RAYS; OBSERVATIONS; PULSARS; INDIVIDUAL; (GEMINGA);

D O I：

10.1086/173645

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory (CGRO) has carried out extensive studies of the gamma-ray source Geminga. Following the detection of pulsed X-rays (Halpern and Holt 1992) from Geminga, Bertsch et al. (1992) reported the same 237 ms periodicity to be visible in the EGRET data. A full analysis of the Geminga source shows that the energy spectrum is compatible with a power law with a spectral index of - 1.50 +/- 0.08 between 30 MeV and 2 GeV. A falloff relative to the power law is observed for energies above 2 GeV. Phase-resolved spectra also show power laws with high-energy cutoffs, but with significant variation of the spectral index with phase. No unpulsed emission is observed. No evidence for time variation was found within the EGRET observations.

引用

页码：276 / 283

页数：8

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