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

被引：181
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
收藏
页码：L118 / L121
页数：4
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