BAT AGN Spectroscopic Survey. XVI. General Physical Characteristics of BAT Blazars

Vaidehi S. Paliya, M. Koss, B. Trakhtenbrot, C. Ricci, K. Oh, M. Ajello, D. Stern, M. C. Powell, C. M. Urry, F. Harrison, I. Lamperti, R. Mushotzky, L. Marcotulli, J. Mejía-Restrepo, D. Hartmann

Research output: Contribution to journalArticlepeer-review


The recently released 105-month Swift-Burst Alert Telescope (BAT) all-sky hard X-ray survey catalog presents an opportunity to study astrophysical objects detected in the deepest look at the entire hard X-ray (14-195 keV) sky. Here we report the results of a multifrequency study of 146 blazars from this catalog, quadrupling the number compared to past studies, by utilizing recent data from the Fermi-Large Area Telescope (LAT), Swift-BAT, and archival measurements. In our γ-ray analysis of ∼10 yr of the LAT data, 101 are found as γ-ray emitters, whereas, 45 remains LAT undetected. We model the broadband spectral energy distributions with a synchrotron-inverse Compton radiative model. On average, BAT detected sources host massive black holes (M bh ∼ 109 M o) and luminous accretion disks (L d ∼ 1046 erg s-1). At high redshifts (z > 2), BAT blazars host more powerful jets with luminous accretion disks compared to those detected only with Fermi-LAT. We find good agreement in the black hole masses derived from the single-epoch optical spectroscopic measurements and standard accretion disk modeling approaches. Other physical properties of BAT blazars are similar to those known for Fermi-LAT detected objects.

Original languageEnglish
Article number154
JournalAstrophysical Journal
Issue number2
StatePublished - 20 Aug 2019


  • galaxies: active
  • galaxies: jets


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