Speaker
Description
With an estimated age of approximately $3\cdot10^5$ years and at the distance of 250 pc, Geminga (PSRJ0633+17) is an old nearby pulsar and the prototype of the gamma-ray loud and radio-quiet pulsars.
The Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope has continuously observed Geminga over its eleven years of operation characterizing its doubly peaked pulsed emission and spectrum. Due to the small collection area of LAT, observations of Geminga above 20 GeV quickly become statistically limited.
On the other hand, the energy threshold of MAGIC, when using the stereo Sum-Trigger-II, is reduced to $\sim20$ GeV, thus further enabling for the observation of very soft sources such as pulsars, high redshift AGNs and GRBs.
Employing the Sum-Trigger-II system, the MAGIC Telescopes have observed the Geminga Pulsar between 2017 and 2019. We report the detection of the pulsed signal, with a significance above 6 sigma, and a spectrum well represented by a single power-law from 20 GeV to 80 GeV. A combined MAGIC and Fermi-LAT fit disfavors a pure exponential cut-off model.
