The \(\gamma\) -ray spectral changes in Fermi blazars

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• 作者：Jianghe Yang ; Junhui Fan ; Jianjun Nie ; Rushu Yang…
• 关键词：Fermi blazars ; BL Lacertae objects ; Quasars ; \(\gamma\) ; Ray emissions ; Photon spectral index ; Luminosity
• 刊名：Astrophysics and Space Science
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：362
• 期：2
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Astrophysics and Astroparticles; Astronomy, Observations and Techniques; Cosmology; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics); Astrobiology;
• 出版者：Springer Netherlands
• ISSN：1572-946X
• 卷排序：362

文摘

Based upon Fermi 2FGL and 3FGL catalogues, a sample of 842 blazars (hereinto 356 FSRQs, 486 BL Lac objects) is collected to discuss the changes of \(\gamma\)-ray photon spectral indices and brightness from 2FGL to 3FGL blazars. Our results indicate that the distributions of \(\gamma\)-ray photon spectral indices and luminosities between 2FGL and 3FGL have no obvious difference; The photon spectral indices and \(\gamma\)-ray luminosity from 2FGL are closely correlated with that from 3FGL respectively; There are close anti-relations between the change of photon spectral indices and the change of luminosity for FSRQs and BL Lac objects samples and for sub-class samples of HBLs, IBLs and LBLs, which suggests that the spectrum becomes flat when the source becomes bright.