Pulsar based modeling of point spread function of Fermi Large Area Telescope

TL;DR

This paper improves the modeling of the Fermi LAT point spread function using pulsar data, reducing uncertainties and clarifying the absence of extended emission around Mrk 501.

Contribution

It introduces an improved PSF parameterization based on pulsar observations, enhancing the accuracy of gamma-ray source analysis.

Findings

Analytical PSF models are inconsistent with pulsar data.

Revised PSF parameters align better with observations.

No extended emission detected around Mrk 501 with the new PSF.

Abstract

Sensitivity of searches for extended emission around gamma-ray sources is naturally limited by the precision of the knowledge of the Point Spread Function (PSF) of gamma-ray telescopes. Inaccuracies in the PSF models of the Fermi Large Area Telescope (LAT) can potentially lead to false positive detections of source extension. We explore uncertainties in the Fermi/LAT PSF by comparing the PSF models provided by the Fermi/LAT Instrument Response Functions (IRFs) with signals of bright pulsars. We compare the analytical PSF models of Fermi/LAT IRFs with pulsar data and fit the pulsar data with the same analytical model as in the Fermi/LAT IRFs to derive an improved set of PSF parameters. We then apply this revised PSF parameterisation to the search of extended emission around a blazar, Mrk 501. We find that the parameters of the analytical PSF models of Fermi/LAT IRFs are inconsistent with the pulsar data. We obtain an improved set of PSF parameters from the fits to pulsar data that is consistent with observations. We find no evidence of the previously reported extended signal around Mrk 501 if the revised PSF consistent with pulsar data is used in data analysis.