DETECTION OF HIGH-ENERGY GAMMA-RAYS FROM QUASAR PKS 0528+134 BY EGRET ON THE COMPTON-GAMMA-RAY-OBSERVATORY

被引：79

作者：

HUNTER, SD

BERTSCH, DL

DINGUS, BL

FICHTEL, CE

HARTMAN, RC

KANBACH, G

KNIFFEN, DA

KWOK, PW

LIN, YC

MATTOX, JR

MAYERHASSELWANDER, HA

MICHELSON, PF

MOLLER, P

VONMONTIGNY, C

NOLAN, PL

PINKAU, K

RADECKE, HD

ROTHERMEL, H

SHAVER, P

SCHNEID, E

SOMMER, M

SREEKUMAR, P

THOMPSON, DJ

机构：

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

[2] NASA,GODDARD SPACE FLIGHT CTR,CSC,COMPTON SCI SUPPORT CTR,GREENBELT,MD 20771

[3] EUROPEAN SO OBSERV,W-8046 GARCHING,GERMANY

[4] GRUMMAN AEROSP CORP,BETHPAGE,NY 11714

[5] NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,GREENBELT,MD 20771

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

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

来源：

ASTROPHYSICAL JOURNAL | 1993年 / 409卷 / 01期

关键词：

QUASARS; INDIVIDUAL; (PKS; 0528+134); GAMMA RAYS; OBSERVATIONS;

D O I：

10.1086/172648

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The first several pointing directions of the Compton Gamma Ray Observatory, launched on 1991 April 5, were toward the Galactic anticenter. In addition to the known gamma-ray sources, Crab (PSR 0531 + 21) and Geminga (2CG 195 + 04), high-energy gamma-ray emission (30 MeV to over 1 GeV) was observed from the quasar PKS 0528 + 134 by the Energetic Gamma Ray Experiment Telescope (EGRET). A redshift measurement, reported here, of 2.07 confirms the identification of this object as a quasar. The differential photon spectrum is well represented by a power law with an exponent of 2.56 +/- 0.09 and a photon intensity above 100 MeV of (8.4 +/- 1.0) x 10(-7) photons cm-2 s-1. There is evidence for time variability on a time scale of a few days.

引用

页码：134 / 138

页数：5

共 29 条

[1] SPECTRA AND LINEAR POLARIZATIONS OF EXTRAGALACTIC VARIABLE SOURCES AT CENTIMETER WAVELENGTHS [J].