The lower limit of the Doppler factor for a Fermi blazar sample
Abstract
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 γ-ray sources, which have X-ray observations. We calculated the lower limits for their Doppler factors, δγ, and compared the lower limits with the available Doppler factors and the apparent superluminal velocities in the literature.
- Publication:
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Research in Astronomy and Astrophysics
- Pub Date:
- September 2014
- DOI:
- 10.1088/1674-4527/14/9/004
- Bibcode:
- 2014RAA....14.1135F