NONTHERMAL X-RAY-EMISSION FROM 3C-273 - THE CORE OF A KNOTTY PROBLEM

被引：9

作者：

DEAN, AJ

BAZZANO, A

COURT, AJ

DIPPER, NA

LEWIS, RA

MAGGIOLI, P

PEROTTI, F

QUADRINI, M

STEPHEN, JB

UBERTINI, P

机构：

[1] IST ASTROFIS SPAZIALE,I-00044 FRASCATI,ITALY

[2] IST FIS COSMICA,I-20133 MILAN,ITALY

[3] IST TECNOL & STUDIO RADIAZ EXTRATERRESTR,I-40126 BOLOGNA,ITALY

来源：

ASTROPHYSICAL JOURNAL | 1990年 / 349卷 / 01期

关键词：

Quasars; X-rays: sources; X-rays: spectra;

D O I：

10.1086/168291

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The quasar 3C 273 was observed in the hard X-ray region of the spectrum (15-300 keV) during a stratospheric balloon flight on 1987 July 15. The emitted photon spectrum is well described by a single power law of photon index -1.61 which corresponds to a hard (20-200 keV) X-ray luminosity of 0.8 × 1047 ergs s-1 (H0 = 50 km s-1 Mpc-1). This flux is consistent with the 1978/1979 HEAO 1 and AIT/MPI measurements and about a factor of 3 below the high state measured in 1981 (AIT/MPI). The implications of these results with respect to the location of the production site and mechanism are discussed.

引用

页码：41 / 44

页数：4

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