Very high energy emission in Active Galactic Nuclei jets.
Speaker: Dra. Sarah Kaufmann
Mesoamerican Centre for Theoretical Physics (MCTP)
Autónoma de Chiapas (UNACH).
Date and Time
October 20, 2016. 12:00 h.
Sala de Usos Múltiples de la Facultad de
Ciencias en Física y Matemáticas (UNACH), Ciudad Universitaria Carretera Emiliano Zapata Km. 8,
Real del Bosque (Terán).
Tuxtla Gutiérrez, Chiapas, México.
MCTP, UNACH and FCFM.
Dra. Karen Salomé Caballero Mora.
Dr. Idrish Huet Hernández.
Dr. Arnulfo Zepeda Domínguez.
Active Galactic Nuclei are luminous, variable objects in the center of
a galaxy. The emitted radiation of AGN cover several decades of
frequencies. The discovery of very high energy (TeV) gamma-ray
emission of BL Lac objects (a class of active galactic nuclei
dominated by non-thermal emission) gave new insights into the particle
acceleration and the emission processes in the highly relativistic
jets. Very high energy emission could be detected in ~5% of the BL Lac
We performed detailed multi wavelength studies over the whole
electromagnetic spectrum, which are crucial to study the emission
processes in detail. As example, some BL Lac objects with exceptional
TeV spectra and different maximum energies in the spectral energy
distribution are presented. The basic aim was to study with new,
simultaneous multi-wavelength observations in the optical, UV, X-ray,
GeV and TeV gamma-ray regime, if the emission processes of these
extreme cases of TeV BL Lac objects can be explained by the
synchrotron Self-Compton model, which is well established for the
class of BL Lac objects at lower energies. During one of this studies,
a clear extended non-thermal X-ray jet in AP Librae was detected. This
was surprising, since X-ray jets are unusual for TeV emitting BL Lac