GAMMA-RAY AND X-RAY EMISSION FROM GAMMA-RAY-LOUD BLAZARS
Zhang Xiong (张雄)ab, Zhao Gang (赵刚)a, Xie Guang-zhong (谢光中)c, Zheng Guang-sheng (郑广生)d, Zhang Li (张力)d
a Beijing Astronomical Observatory, Chinese Academy of Sciences, Beijing 100080, China; b Department of Physics, Yunnan Normal University, Kunming 650092, China; c Yunnan Observatory, Chinese Academy of Sciences, Kunming 650091, China; d Department of Physics, the University of Hong Kong, Hong Kong, China
Abstract We present a strong correlation of the gamma-ray (above 100 MeV) mean spectral indices $\alpha_\gamma$ and X-ray (1 keV) mean spectral indices $\alpha$X for 34 gamma-ray-loud blazars (16 BL Lac objects and 18 flat spectrum radio quasars). A strong correlation is also found between the gamma-ray flux densities $F_\gamma$ and X-ray flux densities FX in the low state for 47 blazars (17 BL Lac and 30 flat spectrum radio quasars). Possible correlation on the gamma-ray emission mechanism is discussed. We suggest that the main gamma-ray radiation mechanism is probably the synchrotron process. The gamma-ray emission may be somewhat different from that of BL Lac objects and flat spectrum radio quasars.
Received: 10 July 2000
Revised: 14 January 2001
Accepted manuscript online:
PACS:
98.54.Cm
(Active and peculiar galaxies and related systems (including BL Lacertae objects, blazars, Seyfert galaxies, Markarian galaxies, and active galactic nuclei))
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
