Mr
Hubing Xiao
(Department of Physics and Astronomy, University of Padova)
22/01/2019, 17:30
Main track
Poster
We report our study on the classification of the unassociated sources in 3FGL with Ensemble Machine Learning (EML) method. The two main objectives of our research are: 1)to categorize the unknown sources into AGN and PSR, 2)to identify BCUs to be BL Lacs and FSRQs. Our final purpose is to take advantage of the EML method to obtain a more complete category of the Fermi sources. The experiments...
Dr
Valerio Vittorini
(iaps inaf rome)
22/01/2019, 17:30
Main track
Poster
Bright and fast gamma-ray flares have been recently detected from
the Blazar 3C 279, with GeV luminosities up to 10^49 erg/s.
The source is observed to
flicker on timescales of minutes
with no comparable optical-UV counterparts. Such observations
challenge current models of high-energy emissions from Blazar sources that are dominated by relativistic
jets along our line of sight with ...
Laura Olivera-Nieto
(Università di Padova, Università degli Studi di Roma "Tor Vergata")
22/01/2019, 17:30
Main track
Poster
In September 2017, the IceCube Neutrino Observatory detected an extremely-high-energy neutrino event, consisting of a muon coming from the bottom of the detector through the Earth, likely originated by a neutrino of energy of around 290 TeV. Promptly alerted, the Fermi LAT and MAGIC collaborations detected at more than 5σ a flare from the known gamma-ray blazar TXS 0506 +056, at a redshift...
Mrs
Stefania Kerasioti
(National & Kapodistrian University of Athens)
22/01/2019, 17:30
Main track
Poster
Very long baseline interferometry offers high resolution images of parsec scale structures of AGN jets. These maps along with systematic observations and polarization measurements, when associated with synchrotron radiation from highly energetic electrons, provide significant information on spatial and dynamical evolution of the emitting regions. By modeling the physical conditions in blazar...
Dr
Maria Magdalena Gonzalez
(Universidad Nacional Autonoma de Mexico)
22/01/2019, 17:30
Main track
Poster
The High-Altitude Water Cherenkov (HAWC) observatory is a wide field-of-view instrument under operations since March 2015 and located in the state of Puebla, Mexico. HAWC observes two thirds of the sky daily at energies between 0.1 and 100 TeV with a duty cycle greater than 95%. This capability allows us to monitor unbiasedly known AGNs as the blazar Mrk 421 or the radio galaxy M87, to search...
Dr
Riccardo Ferrazzoli
(INAF-IAPS)
22/01/2019, 17:30
Main track
Poster
X-ray polarimetry is entering in a golden age thanks to the technological maturity of polarimeters involving Gas Pixel Detectors and the study and development of dedicated space missions, such as IXPE by NASA and ASI and eXTP by CSA.
A simulation of an IXPE observation of the radio galaxy Centaurus A is presented.
Centaurus A is the nearest AGN and is included in the observing plan of IXPE...
Mr
Charalampos Sinnis
(Section of Astrophysics, Astronomy & Mechanics, Department of Physics, School of Sciences, National and Kapodistrian University of Athens)
22/01/2019, 17:30
Main track
Poster
Astrophysical jets are collimated outflows extending in length several times their radii. Even though current -- driven and Kevin -- Helmholtz instabilities form along the flow, jets are observed to retain their shape almost intact. The jet dynamics are described by the ideal MHD equations and the stability is studied through a linear analysis, i.e., we introduce perturbations of the physical...
Dr
Nissim Fraija
(Instituto de Astronomia - UNAM)
22/01/2019, 17:30
Main track
Poster
The broadband spectral energy distribution (SED) of blazars has two well-separated peaks, one of low energy at soft X-rays and the other of high energy at hundreds of GeVs. The SED of blazars is generally understood through the standard one-zone synchroton self-Compton (SSC) model, where a strong correlation between X-ray and TeV gamma-ray fluxes is expected. During the last decade, a...
