Journal Article

PUBDB-2024-07226

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Historical Fermi All-sky Variability Analysis of Galactic Flares

Joffre, S. D. (Corresponding author) ; Torres-Albà, N. ; Ajello, M. ; Kocevski, D. ; Bühler, R.DESY*

2024
Institute of Physics Publ. London

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Please use a persistent id in citations: doi:10.3847/1538-4357/ad4494  doi:10.3204/PUBDB-2024-07226

Report No.: arXiv:2402.07994

Abstract: The Fermi All-sky Variability Analysis (FAVA) provides a photometric alternative for identifying week-long gamma-ray flares across the entire sky while being independent of any diffuse Galactic or isotropic emission model. We reviewed 779 weeks of Fermi Large Area Telescope data analyzed by FAVA to estimate the rate and origin of Galactic gamma-ray flares, and to search for new variable Galactic gamma-ray transients. We report an estimated yearly rate of ∼8.5 Galactic gamma-ray flares yr$^{–1}$, with ∼1 flare yr$^{–1}$ coming from unknown sources. Out of the known gamma-ray sources that are spatially coincident with these detected flares, we report gamma-ray flares for six of them for the first time. All six are classified as pulsars, or a source of unknown nature but which positionally overlaps with known supernova remnants or pulsar wind nebulae (PWNe). This potentially means these sites are tentative candidates to be the second known site of a variable gamma-ray PWN, after the famous Crab Nebula’s PWN. Additionally, we identify nine unassociated flares that are unlikely to have originated from known gamma-ray sources.

Note: Submitted to ApJ Feb. 28 2024. Minor edits in Section 4 and 5 for clarity. 26 pages, 6 figures, 5 Tables

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Contributing Institute(s):

1. Gammaastronomie (Z_GA)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)

Experiment(s):

1. Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy

Appears in the scientific report 2024

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Joffre, S. D. (Corresponding author) ; Torres-Albà, N. ; Ajello, M. ; Kocevski, D. ; Bühler, R.DESY*
Historical Fermi All-sky Variability Analysis of Galactic Flares
[10.3204/PUBDB-2025-00137]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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