GeV BREAKS IN BLAZARS AS A RESULT OF GAMMA-RAY ABSORPTION WITHIN THE BROAD-LINE REGION

被引：185

作者：

Poutanen, Juri ^{[1
]}

Stern, Boris ^{[1
,2
,3
]}

机构：

[1] Univ Oulu, Dept Phys, Astron Div, Oulu 90014, Finland

[2] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

[3] Ctr Astro Space, PN Lebedev Phys Inst, Moscow 117997, Russia

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2010年 / 717卷 / 02期

基金：

芬兰科学院;

关键词：

BL Lacertae objects: general; galaxies: active; galaxies: jets; gamma rays: general; radiation mechanisms: non thermal; ACTIVE GALACTIC NUCLEI; RADIATION; QUASARS; COMPTONIZATION; CASCADES; EMISSION; SAMPLE; JETS;

D O I：

10.1088/2041-8205/717/2/L118

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Spectra of the brightest blazars detected by the Fermi Gamma-ray Space Telescope Large Area Telescope cannot be described by a simple power-law model. A much better description is obtained with a broken power law, with the break energies of a few GeV. We show here that the sharpness and the position of the breaks can be well reproduced by absorption of. gamma-rays via photon-photon pair production on He II Lyman recombination continuum and lines. This implies that the blazar zone lies inside the region of the highest ionization of the broad-line region (BLR) within a light-year from a super-massive black hole. The observations of. gamma-ray spectral breaks open a way of studying the BLR photon field in the extreme-UV/soft X-rays, which are otherwise hidden from our view.

引用

页码：L118 / L121

页数：4

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