2018ApJ...859...49P -
Astrophys. J., 859, 49-49 (2018/May-3)
X-ray flux and spectral variability of six TeV blazars with NuSTAR.
PANDEY A., GUPTA A.C. and WIITA P.J.
Abstract (from CDS):
We report the first results of timing and spectral studies of Nuclear Spectroscopic Telescope Array observations of six TeV-emitting high-frequency peaked blazars: 1ES 0347-121, 1ES 0414+009, RGB J0710+591, 1ES 1101-232, 1ES 1218+304, and H 2356-309. Two out of these six TeV blazars, 1ES 1101-232 and 1ES 1218+304, showed strong evidence of intraday variations in the 3-79 keV energy range during those observations. We also found a hint of an intraday variability timescale of 23.5 ks in the light curve of 1ES 1218+304 using an autocorrelation function analysis. We obtained a magnetic field B ∼ 0.03 G, electron Lorentz factor γ ∼ 2.16 x 106, and emission region size R ∼ 1.19 x 1016 cm for 1ES 1218+304 using that variability timescale. The other blazars' light curves do not show any variability timescales shorter than their observation lengths; however, we note that the data were both noisier and sparser for them. We also investigated the spectral shape of these TeV blazars and found that the spectrum of 1ES 0414+009 is well described by a single power law with a photon index Γ ∼ 2.77. The spectra of the other five HBLs are somewhat better represented by log-parabola models with local photon indices (at 10 keV) α ∼ 2.23 - 2.67 and curvature parameters β ∼ 0.27 - 0.43.
Abstract Copyright:
© 2018. The American Astronomical Society. All rights reserved.
Journal keyword(s):
BL Lacertae objects: general - galaxies: active
Simbad objects:
14
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