A STUDY OF M31, M87, NGC 253, AND M82 IN HIGH-ENERGY GAMMA-RAYS

被引：32

作者：

SREEKUMAR, P

BERTSCH, DL

DINGUS, BL

ESPOSITO, JA

FICHTEL, CE

HARTMAN, RC

HUNTER, SD

KANBACH, G

KNIFFEN, DA

LIN, YC

MATTOX, JR

MAYERHASSELWANDER, HA

MICHELSON, PF

VONMONTIGNY, C

NOLAN, PL

SCHNEID, EJ

THOMPSON, DJ

机构：

[1] MAX PLANCK INST EXTRATERR PHYS,W-8046 GARCHING,GERMANY

[2] HAMPDEN SYDNEY COLL,HAMPDEN SYDNEY,VA 23943

[3] STANFORD UNIV,HANSEN EXPTL PHYS LAB,STANFORD,CA 94305

[4] COMP SCI CORP,COMPTON OBSERV SCI SUPPORT CTR,ASTRON PROGRAMS,GREENBELT,MD

[5] GRUMMAN AEROSP CORP,BETHPAGE,NY 11714

来源：

ASTROPHYSICAL JOURNAL | 1994年 / 426卷 / 01期

关键词：

COSMIC RAYS; GALAXIES; GENERAL; GAMMA RAYS; OBSERVATIONS;

D O I：

10.1086/174044

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The data from the Energetic Gamma Ray Experiment Telescope (EGRET) all-sky survey are examined for emission from the nearby galaxies M31, M87, NGC 253, and M82 in the high-energy (E > 30 MeV) gamma-ray range. No significant emission is observed from any of these galaxies. The derived upper limits for all four galaxies are consistent with that expected from cosmic-ray interactions. For M87, the combination of the high-energy gamma-ray and radio data point to a lower limit of 7 muG for the magnetic field in the disk and 4 muG for the magnetic field in the halo, consistent with equipartition arguments. A study of NGC 253 and M82 show that EGRET observations do not sufficiently constrain the mean cosmic-ray energy density to provide more details on the cosmic-ray distribution in starburst galaxies.

引用

页码：105 / 108

页数：4

共 35 条

[1]

AKYUZ A, 1991, ASTRON ASTROPHYS, V248, P419

[2]

ANDERNACH H, 1979, ASTRON ASTROPHYS, V74, P93

[3] VLBI OBSERVATIONS OF 23 HOT-SPOTS IN THE STARBURST GALAXY M82 [J].