X-Ray Spectral Variability of Extreme BL Lac AGN H1426+428

Abstract

Between 7 March 2002 and 15 June 2002, intensive X-ray observations were carried out on the extreme BL Lac object H1426+428 with instruments on board the Rossi X-ray Timing Explorer (RXTE). These instruments provide measurements of H1426+428 in the crucial energy range that characterizes the first peak of its spectral energy distribution. This peak, which is almost certainly due to synchrotron emission, has previously been inferred to be in excess of 100 keV. By taking frequent observations over a four-month campaign, which included $\sim$450 ksec of RXTE time, studies of flux and spectral variability on multiple timescales were performed, along with studies of spectral hysteresis. The 3-24 keV X-ray flux and spectra exhibited significant variability, implying variability in the location of the first peak of the spectral energy distribution. Hysteresis patterns were observed, and their characteristics have been discussed within the context of emission models.

arXiv commentaccepted for publication in Astrophysical Journal

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• Multiwavelength Observations of the Blazar Mrk 421 in December 2002 and January 2003
• Hard X-ray properties of NuSTAR blazars
• X-ray Flares from Markarian 501
• A search for spectral hysteresis and energy-dependent time lags from X-ray and TeV gamma-ray observations of Mrk 421
• X-ray flux variability of active galactic nuclei observed using NuSTAR
• Multiwavelength Observations of 1ES 1959+650, One Year After the Strong Outburst of 2002
• X-ray and TeV Gamma-Ray Emission from Parallel Electron-Positron or Electron-Proton Beams in BL Lac Objects
• Constraining the Emission Properties of TeV Blazar H1426+428 by the Synchrotron-Self-Compton Model
• X-Ray Spectral Variability of Thirteen TeV High Energy Peaked Blazars with XMM-Newton
• Time-Dependent Modeling of the Sub-Hour Spectral Evolution During the 2013 Outburst of Mrk 421
• An XMM-Newton catalogue of BL Lacs
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