Energy-dependent periodicities of LS I +61°303 in the GeV band-Reference-Cited by-同舟云学术

Energy-dependent periodicities of LS I +61°303 in the GeV band

Published:2023-08-07 Issue:2 Volume:525 Page:2202-2207
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Chernyakova M¹²^ORCID,Malyshev D³,Neronov A⁴⁵,Savchenko D⁴⁶⁷^ORCID

Affiliation:

1. School of Physical Sciences and Centre for Astrophysics & Relativity, Dublin City University , D09 W6Y4 Glasnevin , Ireland

2. Dublin Institute for Advanced Studies , 31 Fitzwilliam Place, D02 XF86 Dublin 2 , Ireland

3. Institut für Astronomie und Astrophysik, Universität Tübingen , Sand 1, D-72076 Tübingen , Germany

4. Astroparticule et Cosmologie, CNRS, Université de Paris, , F-75006 Paris , France

5. Laboratory of Astrophysics, École Polytechnique Fédérale de Lausanne , CH-1015 Lausanne , Switzerland

6. Bogolyubov Institute for Theoretical Physics of the NAS of Ukraine , 03143 Kyiv , Ukraine

7. Data science center, Department of Theoretical and Mathematical Physics, Kyiv Academic University , 03142 Kyiv , Ukraine

Abstract

ABSTRACT LS I +61°303 is a rare representative of the gamma-ray binaries with a compact object known to be a pulsar. We report on the periodicity and spectral analysis of this source performed with more than 14 yr of Fermi/LAT data. The periodicity of LS I +61°303 is strongly energy dependent. Two periods P1 = 26.932 ± 0.004(stat) ± 0.008(syst) and P2 = 26.485 ± 0.004(stat) ± 0.007(syst) are detected only at E > 1 GeV and at E < 0.3 GeV correspondingly. Within 1σ (stat + syst) the periods are consistent with orbital (P2) and beat orbital/superorbital (P1) periods. We present the orbital light curves of the system in several energy bands and the results of the spectral analysis. We discuss the possible origin of the change in the variability pattern between 0.1 and 1 GeV energy.

Funder

DFG

Deutsches Zentrum für Luft- und Raumfahrt

Irish Research Council

MEAE

MESR

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stad2380/51050675/stad2380.pdf

Reference23 articles.

1. Fermi Large Area Telescope Fourth Source Catalog

2. ASSOCIATING LONG-TERM γ-RAY VARIABILITY WITH THE SUPERORBITAL PERIOD OF LS I +61°303

3. THE ORBITS OF THE γ-RAY BINARIES LS I +61 303 AND LS 5039

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1. A New Puzzling Periodic Signal in GeV Energies of the γ-Ray Binary LS I+61°303;The Astrophysical Journal;2024-08-27