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SUMMARY:A one-parameter two-zone leptonic model for the blazar sequence
DTSTART:20260413T123000Z
DTEND:20260413T124500Z
DTSTAMP:20260418T160500Z
UID:indico-event-1783@indico.dfa.unipd.it
DESCRIPTION:Speakers: Wenxin Yang (Università degli Studi di Padova)\nBla
 zars\, a subclass of radio-loud active galactic nuclei with relativistic j
 ets aligned close to our line of sight\, emit highly variable nonthermal r
 adiation across the electromagnetic spectrum. The physical origin of their
  emission and the blazar sequence remain open questions. We present a self
 -consistent two-zone leptonic model in which relativistic electrons accele
 rate in a compact region\, losing energy via synchrotron and inverse Compt
 on processes\, and escape into a larger zone permeated by an external phot
 on field associated with magnetohydrodynamic winds from the accretion disk
 . By varying only the mass accretion rate onto the central black hole\, th
 e model naturally reproduces the blazar sequence\, including Compton domin
 ance\, γ-ray spectral indices\, and the positions of synchrotron and inve
 rse Compton peaks\, while variations in the secondary parameters account f
 or the observed spread in the data. Flat-spectrum radio quasars exhibit st
 rong external Compton emission from the extended zone\, whereas BL Lac obj
 ects are dominated by synchrotron and synchrotron self-Compton emission fr
 om the compact acceleration region. This framework highlights the key role
  of accretion rate and spatially structured emission zones in shaping blaz
 ar spectra and provides a unified interpretation of their diverse phenomen
 ology.\n\nhttps://indico.dfa.unipd.it/event/1783/
LOCATION:Aula Rosino (Dipartimento di Fisica e Astronomia - Edificio ex-Ri
 zzato)
URL:https://indico.dfa.unipd.it/event/1783/
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