X-Ray and TeV Emissions from High-frequency-peaked BL Lac Objects

Details X-Ray and TeV Emissions from High-frequency-peaked BL Lac Objects X-Ray and TeV Emissions from High-frequency-peaked BL Lac Objects

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011apj...742l..32m&link_type=abstract

The Astrophysical Journal Letters, Volume 742, Issue 2, article id. L32 (2011).

Astronomy and Astrophysics

Astronomy

Acceleration Of Particles, Bl Lacertae Objects: General, Galaxies: Active, Radiation Mechanisms: Non-Thermal, X-Rays: Galaxies

Scientific paper

The majority of the extragalactic sources yet detected at TeV photon energies belong to the class of "high-frequency-peaked BL Lac objects" (HBLs) that exhibit a spectral energy distribution with a lower peak in the X-ray band. Such spectra are well described in terms of a log-parabolic shape with considerable curvature, and widely interpreted as synchrotron emission from ultrarelativistic electrons outflowing in a relativistic jet; these are expected to radiate also in γ-rays through the inverse Compton process. Recently, we have compared the X-ray spectral parameter distributions of TeV detected HBLs (TBLs) with those undetected (UBLs), and found that the distributions of the peak energies Ep are similarly symmetric around a value of a few keVs for both subclasses, while the X-ray spectra are broader for TBLs than for UBLs. Here we propose an acceleration scenario to interpret both the Ep and the spectral curvature distributions in terms of a coherent and a stochastic acceleration mechanisms, respectively. We show how the curvature parameter b ~= 0.3-0.7 of the synchrotron X-rays, which depends only on the latter acceleration component, can be related to the inverse Compton luminosity in γ-rays, thus introducing a link between the X-ray and the TeV observations of HBLs.

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