EVIDENCE FOR NEUTRAL EMISSION ABOVE 10(17)EV FROM LMC X-4

被引：9

作者：

MEYHANDAN, R ^{[1
]}

DAWSON, BR ^{[1
]}

CLAY, RW ^{[1
]}

HORTON, L ^{[1
]}

ULRICHS, J ^{[1
]}

WINN, MM ^{[1
]}

机构：

[1] UNIV SYDNEY,SCH PHYS,DEPT FALKINER NUCL PHYS,SYDNEY,NSW 2006,AUSTRALIA

来源：

ASTROPHYSICAL JOURNAL | 1992年 / 391卷 / 01期

关键词：

COSMIC RAYS; GAMMA-RAYS; OBSERVATIONS; STARS; NEUTRON;

D O I：

10.1086/171339

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have searched the data set of the SUGAR cosmic ray detector for indications of emission above 10(17) eV from two binary X-ray sources, Vela X-ray sources, Vela X-1 and LMC X-4. There is no indication of a signal from Vela X-1 and an upper limit on the flux is set at 1.5 x 10(-16) cm-2 s-1 above 2 x 10(17) eV (95% C.L.). However, we find evidence for neutral emission from LMC X-4 with a confidence of 99.6%, having observed a 1.4 day modulation in the signal consistent with the orbital period of the binary system. The flux is estimated at (5.2 +/- 1.5) X 10(-16) cm-2 s-1 above 2 x 10(17) eV at the top of the atmosphere. The light curves of both sources are compared with those obtained at PeV energies and we discuss the likely nature of the signal from LMC X-4.

引用

页码：236 / 241

页数：6

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