SIMBAD references

2011ApJ...739...73M - Astrophys. J., 739, 73 (2011/October-1)

X-ray spectral curvature of high-frequency-peaked BL Lac objects: a predictor for the TeV flux.

MASSARO F., PAGGI A., ELVIS M. and CAVALIERE A.

Abstract (from CDS):

Most of the extragalactic sources detected at TeV energies are BL Lac objects. They belong to the subclass of high-frequency-peaked BL Lac objects (HBLs) exhibiting spectral energy distributions with a lower energy peak in the X-ray band; this is widely interpreted as synchrotron emission from relativistic electrons. The X-ray spectra are generally curved and well described in terms of a log-parabolic shape. In a previous investigation of TeV HBLs (TBLs) we found two correlations between their spectral parameters. (1) The synchrotron peak luminosity Lp increases with its peak energy Epand (2) the curvature parameter b decreases as Epincreases. The first is consistent with the synchrotron scenario, while the second is expected from statistical/stochastic acceleration mechanisms for the emitting electrons. Here, we present an extensive X-ray analysis of a sample of HBLs observed with XMM-Newton and Swift but undetected at TeV energies (UBLs), to compare their spectral behavior with that of TBLs. Investigating the distributions of their spectral parameters and comparing the TBL X-ray spectra with that of UBLs, we develop a criterion to select the best HBL candidates for future TeV observations.

Abstract Copyright:

Journal keyword(s): acceleration of particles - BL Lacertae objects: general - galaxies: active - radiation mechanisms: non-thermal - X-rays: galaxies

Simbad objects: 54

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2019.10.20-17:49:36

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