Investigating γ-ray halos around three HAWC bright sources in Fermi-LAT data
Loading...
Links to Files
Permanent Link
Author/Creator
Author/Creator ORCID
Date
Type of Work
Department
Program
Citation of Original Publication
Mattia Di Mauro, Silvia Manconi, Michela Negro and Fiorenza Donato, Investigating γ-ray halos around three HAWC bright sources in Fermi-LAT data, https://arxiv.org/pdf/2012.05932.pdf
Rights
This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
Subjects
Abstract
Numerous extended sources around Galactic pulsars have shown significant γ-ray emission from GeV to TeV energies, revealing hundreds of TeV energy electrons scattering off of the underlying photon fields through inverse Compton scattering (ICS). HAWC TeV gamma-ray observations of few-degree extended emission around the pulsars Geminga and Monogem, and LAT GeV emission around Geminga, suggest that systems older than 10-100 kyr have multi-TeV e± propagating beyond the SNR-PWN system into the interstellar medium. Following the discovery of few γ-ray sources by HAWC at energies E>100 TeV, we investigate the presence of an extended γ-ray emission in Fermi-LAT data around the three brightest sources detected by HAWC up to 100 TeV. We find an extended emission of θ₆₈=1.00⁺⁰·⁰⁵₋₀.₀₇ deg around eHWC J1825-134 and θ68=0.71±0.10 deg eHWC J1907+063. The analysis with ICS templates on Fermi-LAT data point to diffusion coefficient values which are significantly lower than the average Galactic one. When studied along with HAWC data, the γ-ray Fermi-LAT data provide invaluable insight into the very high-energy electron and positron parent populations.