Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 60: Gamma astronomy 3
T 60.2: Vortrag
Mittwoch, 6. März 2024, 16:15–16:30, Geb. 30.22: kl. HS A
Gamma-ray pulsar glitches: a study of variability in Fermi-LAT data — •Giovanni Cozzolongo1,2, Massimiliano Razzano2,3, Alessio Fiori2,3, and Pablo Saz Parkinson4 — 1Erlangen Centre for Astroparticle Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg — 2University of Pisa — 3Istituto Nazionale di Fisica Nucleare — 4University of California at Santa Cruz
Pulsars are the largest class of Galactic sources detected by NASA's Large Area Telescope (LAT) on the Fermi mission. Pulsars are generally acknowledged as very stable astrophysical rotators, that gradually slow down by emitting radiation at the expense of their rotational energy. Occasionally, pulsars can undergo transient events called glitches, which are rapid changes in their rotational parameters and typically followed by a relaxation phase. Variability in the emission features correlated to glitches has been observed in a small family of radio pulsars and in the radio-quiet PSR J2021+4026, the only variable pulsar observed by the LAT. Here we present a novel analysis of LAT gamma-ray pulsars consisting of a study of variability correlated with changes in the spin-down rate. We perform a maximum likelihood spectral analysis of LAT data around detected glitches, aiming at measuring variations in the gamma-ray flux and spectral parameters. We present results for a subset of glitches that we consider particularly promising. Our study suggests the importance of variability analysis to achieve a deeper understanding of pulsar physics.
Keywords: Fermi-LAT; pulsar