{
  "id": "2007.14600",
  "version": "v1",
  "published": "2020-07-29T05:06:01.000Z",
  "updated": "2020-07-29T05:06:01.000Z",
  "title": "NuSTAR View of TeV Blazar Mrk 501",
  "authors": [
    "Ashwani Pandey"
  ],
  "comment": "13 pages, 3 figures, 3 tables, published in special issue \"X-Ray Flux and Spectral Variability of Blazars\" of Galaxies journal",
  "journal": "Galaxies 2020, 8(3), 55",
  "doi": "10.3390/galaxies8030055",
  "categories": [
    "astro-ph.HE"
  ],
  "abstract": "We report the results of flux and spectral variability studies of all seven {\\it Nuclear Spectroscopic Telescope Array (NuSTAR)} observations of TeV $\\gamma-$ray emitting blazar Markarian (or Mrk) 501. We found strong evidence of intraday variability in 3-79 keV X-ray light curves (LCs) of Mrk 501 during four out of these seven observations. We examined spectral variability using a model-independent hardness-ratio analysis and found a general \"harder-when-brighter\" behaviour in two observations. We also investigated the nature of 3-79 keV X-ray spectra of TeV blazar Mrk 501 and found that five out of seven spectra are well described by the curved log-parabola models with photon indices (at 10 keV) $\\alpha \\sim$ 2.12-2.32 and a curvature $\\beta \\sim$ 0.15-0.28. The two other spectra are somewhat better represented by simple power-law models with photon indices 2.70 and 2.75. We briefly discuss available physical models to explain our results.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-07-29T05:06:01.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "tev blazar mrk",
      "nustar view",
      "photon indices",
      "kev x-ray light curves",
      "nuclear spectroscopic telescope array"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}