Joint Analysis of Fermi-LAT and HAWC Observations of SS 433/W50

Discussion timeslot (ZOOM-Meeting): 16. July 2021 - 12:00
ZOOM-Meeting URL: https://desy.zoom.us/j/98542982538
ZOOM-Meeting ID: 98542982538
ZOOM-Meeting Passcode: ICRC2021
Corresponding Session: https://icrc2021-venue.desy.de/channel/50-Galactic-Compact-Objects-Pulsars-Binary-Systems-Microquasars-GAD-GAI/124
Live-Stream URL: https://icrc2021-venue.desy.de/livestream/Discussion-04/5

Abstract:
'The extended jets of the microquasar SS 433 have been observed in radio, optical, X-ray, and recently very-high-energy gamma-ray by HAWC. The multi-wavelength detections motivate searches for high-energy gamma-ray counterparts in the Fermi-LAT data in the 100 MeV– 300 GeV band. We report on the first-ever joint analysis of Fermi-LAT and HAWC observations to study the spectrum and location of gamma-ray emission from a source inside a region-of-interest. Our analysis finds common emission sites of GeV-to-TeV gamma-rays inside the eastern and western lobes of SS 433. The observation suggests that the gamma rays from the eastern lobe is consistent with inverse-Compton emission by an electron population that is accelerated by jets. To explain both the GeV and TeV flux, the electrons need to have a soft intrinsic energy spectrum, or undergo a quick cooling process due to synchrotron radiation in a magnetized environment.'

Authors: Ke Fang
Collaboration: Ferrmi-LATHAWC

Indico-ID: 498
Proceeding URL: https://pos.sissa.it/395/618