Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224

Transitional millisecond pulsars (tMSPs) represent a crucial link between the rotation-powered and accretion-powered states of binary pulsars. During their active X-ray state, tMSPs are the only low-mass X-ray binary systems detected up to GeV energies by the Fermi Large Area Telescope (LAT). CXOU J...

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Autores: Manca, Arianna, Coti Zelati, Francesco, Li, J., Torres, Diego F., Ballet, Jean, Marino, Alessio, Sanna, Andrea, Rea, Nanda, Salvo, Tiziana di, Riggio, Alessandro, Burderi, Luciano, Iaria, Rosario
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/390984
Acceso en línea:http://hdl.handle.net/10261/390984
http://arxiv.org/abs/2502.18073v1
Access Level:acceso abierto
Palabra clave:Accretion
Accretion disks
Methods: data analysis
Stars: neutron
X-rays: binaries
X-rays: individuals: CXOU J110926.4-650224
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repository_id_str
dc.title.none.fl_str_mv Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224
title Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224
spellingShingle Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224
Manca, Arianna
Accretion
Accretion disks
Methods: data analysis
Stars: neutron
X-rays: binaries
X-rays: individuals: CXOU J110926.4-650224
title_short Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224
title_full Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224
title_fullStr Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224
title_full_unstemmed Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224
title_sort Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224
dc.creator.none.fl_str_mv Manca, Arianna
Coti Zelati, Francesco
Li, J.
Torres, Diego F.
Ballet, Jean
Marino, Alessio
Sanna, Andrea
Rea, Nanda
Salvo, Tiziana di
Riggio, Alessandro
Burderi, Luciano
Iaria, Rosario
author Manca, Arianna
author_facet Manca, Arianna
Coti Zelati, Francesco
Li, J.
Torres, Diego F.
Ballet, Jean
Marino, Alessio
Sanna, Andrea
Rea, Nanda
Salvo, Tiziana di
Riggio, Alessandro
Burderi, Luciano
Iaria, Rosario
author_role author
author2 Coti Zelati, Francesco
Li, J.
Torres, Diego F.
Ballet, Jean
Marino, Alessio
Sanna, Andrea
Rea, Nanda
Salvo, Tiziana di
Riggio, Alessandro
Burderi, Luciano
Iaria, Rosario
author2_role author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Agenzia Spaziale Italiana
European Commission
European Research Council
Agencia Estatal de Investigación (España)
Ministerio de Ciencia e Innovación (España)
Swedish Research Council
Swedish National Space Board
Coti Zelati, Francesco [0000-0001-7611-1581]
Iaria, Rosario [0000-0003-2882-0927]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Accretion
Accretion disks
Methods: data analysis
Stars: neutron
X-rays: binaries
X-rays: individuals: CXOU J110926.4-650224
topic Accretion
Accretion disks
Methods: data analysis
Stars: neutron
X-rays: binaries
X-rays: individuals: CXOU J110926.4-650224
description Transitional millisecond pulsars (tMSPs) represent a crucial link between the rotation-powered and accretion-powered states of binary pulsars. During their active X-ray state, tMSPs are the only low-mass X-ray binary systems detected up to GeV energies by the Fermi Large Area Telescope (LAT). CXOU J110926.4–650224 is a newly discovered tMSP candidate in an active X-ray state and is potentially spatially compatible with a faint gamma-ray source listed in the latest Fermi-LAT point-source catalogue as 4FGL J1110.3–6501. Confirming the association between CXOU J110926.4–650224 and the Fermi source is a key step towards validating its classification as a tMSP. We analysed Fermi-LAT data collected from August 2008 to June 2023 to determine a more accurate localisation of the gamma-ray source, characterise its spectral properties, and investigate potential time variability. By thoroughly reconstructing the gamma-ray background around the source using a weighted likelihood model, we obtain a new localisation that aligns with the position of the X-ray source at the 95% confidence level, with a test statistic value of ∼42. This establishes a spatial association between the gamma-ray source and CXOU J110926.4–650224. The gamma-ray emission is adequately described by a power-law model with a photon index of Γ = 2.5 ± 0.1 and a corresponding flux of (3.7 ± 0.9)×10−12 erg cm−2 s−1 in the 0.1–300 GeV range.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/390984
http://arxiv.org/abs/2502.18073v1
url http://hdl.handle.net/10261/390984
http://arxiv.org/abs/2502.18073v1
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language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/EC/H2020/821896
info:eu-repo/grantAgreement/ERC//817661
info:eu-repo/grantAgreement/AEI//RYC2021-030888-I
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dc.publisher.none.fl_str_mv EDP Sciences
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spelling Identification and characterisation of the gamma-ray counterpart of the transitional pulsar candidate CXOU J110926.4-650224Manca, AriannaCoti Zelati, FrancescoLi, J.Torres, Diego F.Ballet, JeanMarino, AlessioSanna, AndreaRea, NandaSalvo, Tiziana diRiggio, AlessandroBurderi, LucianoIaria, RosarioAccretionAccretion disksMethods: data analysisStars: neutronX-rays: binariesX-rays: individuals: CXOU J110926.4-650224Transitional millisecond pulsars (tMSPs) represent a crucial link between the rotation-powered and accretion-powered states of binary pulsars. During their active X-ray state, tMSPs are the only low-mass X-ray binary systems detected up to GeV energies by the Fermi Large Area Telescope (LAT). CXOU J110926.4–650224 is a newly discovered tMSP candidate in an active X-ray state and is potentially spatially compatible with a faint gamma-ray source listed in the latest Fermi-LAT point-source catalogue as 4FGL J1110.3–6501. Confirming the association between CXOU J110926.4–650224 and the Fermi source is a key step towards validating its classification as a tMSP. We analysed Fermi-LAT data collected from August 2008 to June 2023 to determine a more accurate localisation of the gamma-ray source, characterise its spectral properties, and investigate potential time variability. By thoroughly reconstructing the gamma-ray background around the source using a weighted likelihood model, we obtain a new localisation that aligns with the position of the X-ray source at the 95% confidence level, with a test statistic value of ∼42. This establishes a spatial association between the gamma-ray source and CXOU J110926.4–650224. The gamma-ray emission is adequately described by a power-law model with a photon index of Γ = 2.5 ± 0.1 and a corresponding flux of (3.7 ± 0.9)×10−12 erg cm−2 s−1 in the 0.1–300 GeV range.We thank Nestor Mirabal for the help and suggestions with the data analysis. We thank Colin Clark, David Smith, Toby Burnett, Philippe Bruel, Xian Hou, and Matthew Kerr from the Fermi collaboration for the feedback on this work. We acknowledge financial contribution from the agreement ASI-INAF n.2017-14-H.0 and INAF mainstream (PI: A. De Rosa, T. Belloni), from the HERMES project financed by the Italian Space Agency (ASI) Agreement n. 2016/13 U.O and from the ASI-INAF Accordo Attuativo HERMES Technologic Pathfinder n. 2018-10-H.1-2020. We also acknowledge support from the European Union Horizon 2020 Research and Innovation Frame- work Programme under grant agreement HERMES-Scientific Pathfinder n. 821896 and from PRIN-INAF 2019 with the project “Probing the geometry of accretion: from theory to observations” (PI: Belloni). FCZ, AMarino and NR are supported by the H2020 ERC Consolidator Grant “MAGNESIA” under grant agreement No. 817661 (PI: Rea) and from grant SGR2021-01269 (PI: Graber/Rea). FCZ is supported by a Ramón y Cajal fellowship (grant agreement RYC2021-030888-I). This work was also partially supported by the program Unidad de Excelencia Maria de Maeztu CEX2020-001058-M. DFT acknowledges support from grants PID2021-124581OB-I00 funded by MCIN/AEI/10.13039/501100011033 and SGR2021-00426. The Fermi-LAT Collaboration acknowledges support for LAT development, operation and data analysis from NASA and DOE (United States), CEA/Irfu and IN2P3/CNRS (France), ASI and INFN (Italy), MEXT, KEK, and JAXA (Japan), and the K.A. Wallenberg Foundation, the Swedish Research Council and the National Space Board (Sweden). Science analysis support in the operations phase from INAF (Italy) and CNES (France) is also gratefully acknowledged. This work was performed in part under DOE Contract DE-AC02-76SF00515.With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (CEX2020-001058-M)Peer reviewedEDP SciencesAgenzia Spaziale ItalianaEuropean CommissionEuropean Research CouncilAgencia Estatal de Investigación (España)Ministerio de Ciencia e Innovación (España)Swedish Research CouncilSwedish National Space BoardCoti Zelati, Francesco [0000-0001-7611-1581]Iaria, Rosario [0000-0003-2882-0927]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/390984http://arxiv.org/abs/2502.18073v1reponame:DIGITAL.CSIC. 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