Journal
RESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume 14, Issue 9, Pages 1135-1145Publisher
NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
DOI: 10.1088/1674-4527/14/9/004
Keywords
galaxies: BL Lacertae objects; galaxies: quasars; galaxies: jets; gamma-rays: galaxies
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Funding
- National Natural Science Foundation of China [10633010, 11173009]
- Bureau of Education of Guangzhou Municipality [11 Sui-Jiao-Ke[2009]]
- Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme (GDUPS)
- Yangcheng Scholar Funded Scheme [10A027S]
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We selected 457 blazars (193 flat spectrum radio quasars, 61 low-synchrotron peaked blazars, 69 intermediate-synchrotron peaked blazars and 134 high-synchrotron peaked blazars) from the second Fermi-LAT catalog (2FGL) of gamma-ray sources, which have X-ray observations. We calculated the lower limits for their Doppler factors, delta(gamma), and compared the lower limits with the available Doppler factors and the apparent superluminal velocities in the literature.
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