The TANAMI Multiwavelength Program: Dynamic SEDs of Southern Blazars

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aut.relation.pages26
aut.relation.volume591en_NZ
aut.researcherWeston, Stuart
dc.contributor.authorKrauß, Fen_NZ
dc.contributor.authorWilms, Jen_NZ
dc.contributor.authorKadler, Men_NZ
dc.contributor.authorOjha, Ren_NZ
dc.contributor.authorSchulz, Ren_NZ
dc.contributor.authorTrüstedt, Jen_NZ
dc.contributor.authorEdwards, PGen_NZ
dc.contributor.authorStevens, Jen_NZ
dc.contributor.authorRos, Een_NZ
dc.contributor.authorBaumgartner, Wen_NZ
dc.contributor.authorBeuchert, Ten_NZ
dc.contributor.authorBlanchard, Jen_NZ
dc.contributor.authorBuson, Sen_NZ
dc.contributor.authorCarpenter, Ben_NZ
dc.contributor.authorDauser, Ten_NZ
dc.contributor.authorFalkner, Sen_NZ
dc.contributor.authorGehrels, Nen_NZ
dc.contributor.authorGräfe, Cen_NZ
dc.contributor.authorGulyaev, Sen_NZ
dc.contributor.authorHase, Hen_NZ
dc.contributor.authorHoriuchi, Sen_NZ
dc.contributor.authorKreikenbohm, Aen_NZ
dc.contributor.authorKreykenbohm, Ien_NZ
dc.contributor.authorLangejahn, Men_NZ
dc.contributor.authorLeiter, Ken_NZ
dc.contributor.authorLovell, JEJen_NZ
dc.contributor.authorMüller, Cen_NZ
dc.contributor.authorNatusch, Ten_NZ
dc.contributor.authorNesci, Ren_NZ
dc.contributor.authorPursimo, Ten_NZ
dc.contributor.authorPhillips, Cen_NZ
dc.contributor.authorPlötz, Cen_NZ
dc.contributor.authorQuick, Jen_NZ
dc.contributor.authorTzioumis, AKen_NZ
dc.contributor.authorWeston, Sen_NZ
dc.date.accessioned2017-09-17T22:52:41Z
dc.date.available2017-09-17T22:52:41Z
dc.date.copyright2016-06-28en_NZ
dc.date.issued2016-06-28en_NZ
dc.description.abstractContext. Simultaneous broadband spectral and temporal studies of blazars are an important tool for investigating active galactic nuclei (AGN) jet physics. Aims. We study the spectral evolution between quiescent and flaring periods of 22 radio-loud AGN through multiepoch, quasi-simultaneous broadband spectra. For many of these sources these are the first broadband studies. Methods. We use a Bayesian block analysis of Fermi/LAT light curves to determine time ranges of constant flux for constructing quasi-simultaneous spectral energy distributions (SEDs). The shapes of the resulting 81 SEDs are described by two logarithmic parabolas and a blackbody spectrum where needed. Results. The peak frequencies and luminosities agree well with the blazar sequence for low states with higher luminosity implying lower peak frequencies. This is not true for sources in high states. The γ-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. Conclusions. The so-called 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 recently published parameters are in agreement with some of the more direct measurements. For two sources, estimates disagree by more than four orders of magnitude, possibly owing to boosting effects. The shapes of the thermal excess seen predominantly in flat spectrum radio quasars are inconsistent with a direct accretion disk origin.en_NZ
dc.identifier.citationAstronomy & Astrophysics, 591, A130.en_NZ
dc.identifier.doi10.1051/0004-6361/201628595en_NZ
dc.identifier.issn0004-6361en_NZ
dc.identifier.urihttps://hdl.handle.net/10292/10804
dc.publisherEDP Sciences
dc.relation.urihttps://www.aanda.org/articles/aa/abs/2016/07/aa28595-16/aa28595-16.htmlen_NZ
dc.rightsReproduced with permission from Astronomy & Astrophysics, © ESO
dc.rights.accessrightsOpenAccessen_NZ
dc.subjectGalaxies: active / BL Lacertae objects: general / Quasars: general / Relativistic processes
dc.titleThe TANAMI Multiwavelength Program: Dynamic SEDs of Southern Blazarsen_NZ
dc.typeJournal Article
pubs.elements-id203551
pubs.organisational-data/AUT
pubs.organisational-data/AUT/Design & Creative Technologies
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