{
  "id": "1804.10126",
  "version": "v1",
  "published": "2018-04-26T15:58:24.000Z",
  "updated": "2018-04-26T15:58:24.000Z",
  "title": "X-ray Flux and Spectral Variability of Six TeV Blazars with \\textit{NuSTAR}",
  "authors": [
    "Ashwani Pandey",
    "Alok C. Gupta",
    "Paul J. Wiita"
  ],
  "comment": "12 pages, 4 figures, accepted for publication in Astrophysical Journal (ApJ)",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We report the first results of timing and spectral studies of \\textit{Nuclear Spectroscopic Telescope Array (NuSTAR)} 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 magnetic field $B \\sim 0.03$ G, electron Lorentz factor $\\gamma \\sim 2.16 \\times 10^6 $ and emission region size $R \\sim 1.19 \\times 10^{16} $ 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 photon index $\\Gamma \\sim 2.77$. The spectra of the other five HBLs are somewhat better represented by log-parabola models with local photon indices (at 10 keV) $\\alpha \\sim 2.23-2.67$ and curvature parameters, $\\beta \\sim 0.27-0.43$.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-04-26T15:58:24.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "tev blazars",
      "spectral variability",
      "x-ray flux",
      "light curve",
      "photon index"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}