Search for Very High Energy Emission from the millisecond pulsar PSR J0218+4232

Discussion timeslot (ZOOM-Meeting): 16. July 2021 - 18:00
ZOOM-Meeting URL: https://icrc2021.desy.de/pf_access_abstracts
Corresponding Session: https://icrc2021-venue.desy.de/channel/Presenter-Forum-1-Evening-All-Categories/48
Abstract:
'PSR J0218+4232 is a millisecond pulsar (MSP) with high magnetic field strength at the light-cylinder radius ($B_{LC}$ ∼ 3.2 × $10^{5}$ G), making it one of the best candidates for VHE gamma-ray emission. It was one of the first MSPs detected by Fermi-LAT at high energy. The source is possibly an aligned rotator with large unpulsed component(∼50%) in radio and X-rays.rnFor this study, we have analyzed 11.5 years of Fermi-LAT data and 90 hours of MAGIC observations (MJD 58424 - 58791). Fermi-LAT analysis shows evidence for pulsed emission above 25GeV. MAGIC observations were performed with a sub-100GeV optimized Sum-Trigger II system. Due to the unpulsed component, we searched for pulsed emission by using a new background subtraction approach. We did not find any evidence for pulsed or unpulsed VHE emission. Lack of VHE emission detection with our instruments is compatible with our theoretical modeling.'

Authors: Sidika Merve Colak
Co-Authors: Brent Limyansky | Pablo Miguel Saz Parkinson | Alessia Spolon | on behalf of the MAGIC and Fermi-LAT Collaborations
Collaboration: MAGICFermi-LAT

Indico-ID: 72
Proceeding URL: https://pos.sissa.it/395/772