{
  "id": "1510.02817",
  "version": "v1",
  "published": "2015-10-07T07:07:00.000Z",
  "updated": "2015-10-07T07:07:00.000Z",
  "title": "Flux and spectral variability of the blazar PKS 2155-304 with XMM-Newton: Evidence of Particle Acceleration and Synchrotron Cooling",
  "authors": [
    "Jai Bhagwana",
    "A. C. Gupta",
    "I. E. Papadakis",
    "Paul J. Wiita"
  ],
  "comment": "30 pages, 4 figures, 1 tables. Accepted for publication in New Astropnomy (in press)",
  "categories": [
    "astro-ph.HE",
    "astro-ph.CO"
  ],
  "abstract": "We have analyzed XMM-Newton observations of the high energy peaked blazar, PKS 2155-304, made on 24 May 2002 in the 0.3 - 10 keV X-ray band. These observations display a mini-flare, a nearly constant flux period and a strong flux increase. We performed a time-resolved spectral study of the data, by dividing the data into eight segments. We fitted the data with a power-law and a broken power-law model, and in some of the segments we found a noticeable spectral flattening of the source's spectrum below 10 keV. We also performed time-resolved cross-correlation analyses and detected significant hard and soft lags (for the first time in a single observation of this source) during the first and last parts of the observation, respectively. Our analysis of the spectra, the variations of photon-index with flux as well as the correlation and lags between the harder and softer X-ray bands indicate that both the particle acceleration and synchrotron cooling processes make an important contribution to the emission from this blazar. The hard lags indicate a variable acceleration process. We also estimated the magnetic field value using the soft lags. The value of the magnetic field is consistent with the values derived from the broad-band SED modeling of this source.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-10-07T07:07:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "particle acceleration",
      "blazar pks",
      "spectral variability",
      "synchrotron cooling",
      "xmm-newton"
    ],
    "publication": {
      "doi": "10.1016/j.newast.2015.08.005"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 30,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1397120
    }
  }
}