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The TANAMI Multiwavelength Program: Dynamic SEDs of Southern Blazars | | Felicia Krauß
; Joern Wilms
; Matthias Kadler
; Roopesh Ojha
; Robert Schulz
; Jonas Trüstedt
; Philip G. Edwards
; Jamie Stevens
; Eduardo Ros
; Wayne Baumgartner
; Tobias Beuchert
; Jay Blanchard
; Sara Buson
; Bryce Carpenter
; Thomas Dauser
; Sebastian Falkner
; Neil Gehrels
; Christina Gräfe
; Sergei Gulyaev
; Hayo Hase
; Shinji Horiuchi
; Annika Kreikenbohm
; Ingo Kreykenbohm
; Marcus Langejahn
; Katharina Leiter
; Jim E. J. Lovell
; Cornelia Müller
; Tim Natusch
; Roberto Nesci
; Tapio Pursimo
; Chris Phillips
; Christian Plötz
; Jonathan Quick
; Anastasios K. Tzioumis
; Stuart Weston
; | | Date: |
3 May 2016 | | Abstract: | Simultaneous broadband spectral and temporal studies of blazars are an
important tool for investigating active galactic nuclei (AGN) jet physics. We
study the spectral evolution between quiescent and flaring periods of 22
radio-loud AGN through multi-epoch, quasi-simultaneous broadband spectra. For
many of these sources these are the first broadband studies. We use a Bayesian
block analysis of Fermi/LAT light curves in order to determine time ranges of
constant flux for constructing quasi-simultaneous SEDs. The shapes of the
resulting 81 SEDs are described by two logarithmic parabolas and a blackbody
spectrum where needed. For low states the peak frequencies and luminosities
agree well with the blazar sequence, higher luminosity implying lower peak
frequencies. This is not true for sources in a high state. The $gamma$-ray
photon index in Fermi/LAT correlates with the synchrotron peak frequency in low
and intermediate states. No correlation is present in high states. The black
hole mass cannot be determined from the SEDs. Surprisingly, the thermal excess
often found in FSRQs at optical/UV wavelengths can be described by blackbody
emission and not an accretion disk spectrum. The "harder-when-brighter" trend,
typically seen in X-ray spectra of flaring blazars, is visible in the blazar
sequence. Our results for low and intermediate states, as well as the Compton
dominance, are in agreement with previous results. Black hole mass estimates
using the parameters from Bonchi (2013) are in agreement with some of the more
direct measurements. For two sources, estimates disagree by more than four
orders of magnitude, possibly due to boosting effects. The shapes of the
thermal excess seen predominantly in flat spectrum radio quasars are
inconsistent with a direct accretion disk origin. | | Source: | arXiv, 1605.0841 | | Services: | Forum | Review | PDF | Favorites | |
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