Limits from rapid TeV variability of Mrk 421

被引：56

作者：

Celotti, A

Fabian, AC

Rees, MJ

机构：

[1] SISSA, I-34014 Trieste, Italy

[2] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1998年 / 293卷 / 03期

关键词：

accretion; accretion discs; radiation mechanisms; thermal; galaxies; active; BL Lacertae objects; individual; Mrk; 421; jets; gamma-rays; observations;

D O I：

10.1046/j.1365-8711.1998.01073.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The extreme variability event in the TeV emission of Mrk 421, recently reported by the Whipple team, imposes the tightest limits on the typical size of the TeV emitting regions in active galactic nuclei (AGN). We examine the consequences that this imposes on the bulk Lorentz factor of the emitting plasma and on the radiation fields present in the central region of this active nucleus. No strong evidence is found for extreme Lorentz factors. However, energetics arguments suggest that any accretion in Mrk 421 has to take place at low rates, compatible with an advection-dominated regime.

引用

页码：239 / 242

页数：4

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