Conveners
Observational results
- Paolo Padovani
Observational results
- Paolo Padovani
Dr
David Paneque
(SLAC/Kipac)
23/01/2019, 09:00
Talk
Owing to their brightness and proximity (z=0.03), Mrk 421 and Mrk 501 are among the blazars that can be studied with the greatest level of detail; and hence a sort of astrophysical laboratories to study the blazar's phenomena. In the conference I will report recent highlight results obtained from multiwavelength campaigns on these two objects. I will show that they can change their personality...
Dr
Marina Manganaro
(University of Rijeka)
23/01/2019, 09:30
Main track
Talk
The BL Lac object 1ES 2344+51.4 was one of the first sources to be included in the EHBL (Extreme High-peaked BL Lac) family: its broadband Spectral Energy Distribution (SED) features the synchrotron peak in the hard X-ray band, and from previous studies of the object in the VHE (Very-high-energy, E>100GeV) gamma-ray range, its Inverse Compton (IC) peak is expected at ~200GeV.
1ES 2344+51.4...
Orel Gueta
(DESY)
23/01/2019, 09:50
Main track
Talk
The VERITAS array of imaging atmospheric Cherenkov telescopes has collected nearly 5000 hours of active galactic nuclei (AGN) observations. It has detected 39 very-high-energy (VHE, >100 GeV) AGNs at redshifts up to z = 0.9, of which 24 are classified as high-frequency-peaked BL Lacertae objects (HBLs). VERITAS has obtained an extensive dataset of HBL and extreme HBL (xHBL) observations, with...
Mr
Vandad Fallah Ramazani
(Tuorla observatory)
23/01/2019, 10:10
Main track
Talk
Extreme blazars (EHBLs) are generally characterized by a synchrotron peak located at energies > 1 keV in their SED, and by the hardness of their spectrum in the high-energy (HE, E > 100 MeV) gamma-ray range. So far, only a handful of these objects have been detected in very-high-energy (VHE, E > 100 GeV) gamma rays by imaging atmospheric Cherenkov telescopes (IACTs). Some such objects (e.g....
Dr
Rocco Lico
(Max Planck Institute for Radio Astronomy (MPIfR))
23/01/2019, 11:10
Main track
Talk
In this talk we will discuss the time variable rotation measure (RM) observed in the core region of the TeV blazar Markarian 421 (Mrk 421). These results are based on a one-year, multi-frequency (15, 24, and 43 GHz) Very Long Baseline Array monitoring campaign. We explore the possible connection between the RM and the accretion rate and we investigate the Faraday screen properties and its...
Dr
Carolina Casadio
(Max-Planck-Institut für Radioastronomie)
23/01/2019, 11:30
Main track
Talk
Investigating the magnetic field structure in the innermost regions of relativistic jets is fundamental to shed light on the crucial physical processes giving rise to the jet formation, as well as to their extraordinary radiation output up to gamma-ray energies.
We study the variability and magnetic field structure of the quasar CTA 102 with 3 and 7 mm-VLBI polarimetric observations during a...
Dr
Elena Nokhrina
(Moscow Institute of Physics and Technology)
23/01/2019, 11:50
Main track
Talk
Recent observations of blazars with RadioAstron program revealed the jets with brightness temperatures exceeding the limiting equipartition value of 10^{11.5} K. This means that the jet physical parameters depart from their equipartition values. We propose that the non-equipartition jet parameters can be estimated by using the measurements of both the brightness temperature and the core shift...
Dr
Dmitry Blinov
(University of Crete)
Main track
Talk
After 5 years of polarimetric monitoring of blazars, the RoboPol project has uncovered several key characteristics of polarimetric rotations in the optical for these most variable sources. The most important of these is that polarization properties of the synchrotron emission in the optical appear to be directly linked with gamma-ray activity. We will discuss the evidence for this connection,...
