{"id":4482,"date":"2025-09-09T11:54:14","date_gmt":"2025-09-09T09:54:14","guid":{"rendered":"https:\/\/www.oa-cagliari.inaf.it\/seminari\/seminar-under-development\/"},"modified":"2025-10-03T16:30:07","modified_gmt":"2025-10-03T14:30:07","slug":"seminar-under-development","status":"publish","type":"seminari","link":"https:\/\/www.oa-cagliari.inaf.it\/en\/seminars\/seminar-under-development\/","title":{"rendered":"Identification of the gamma-ray counterpart of the transitional pulsar candidate J1109"},"content":{"rendered":"<p align=\"center\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-4780\" src=\"https:\/\/www.oa-cagliari.inaf.it\/wp-content\/uploads\/2025\/09\/featured_pic-300x169.jpg\" alt=\"\" width=\"438\" height=\"247\" srcset=\"https:\/\/www.oa-cagliari.inaf.it\/wp-content\/uploads\/2025\/09\/featured_pic-300x169.jpg 300w, https:\/\/www.oa-cagliari.inaf.it\/wp-content\/uploads\/2025\/09\/featured_pic-1024x576.jpg 1024w, https:\/\/www.oa-cagliari.inaf.it\/wp-content\/uploads\/2025\/09\/featured_pic-768x432.jpg 768w, https:\/\/www.oa-cagliari.inaf.it\/wp-content\/uploads\/2025\/09\/featured_pic-1536x864.jpg 1536w, https:\/\/www.oa-cagliari.inaf.it\/wp-content\/uploads\/2025\/09\/featured_pic.jpg 1920w\" sizes=\"auto, (max-width: 438px) 100vw, 438px\" \/><\/p>\n<p align=\"justify\">Transitional millisecond pulsars (tMSPs) represent a crucial link between binary pulsars in their rotation-powered and accretion-powered states. During their active X-ray state, the tMSPs are the only low-mass X-ray binary systems that are detected up to GeV energies using the Fermi Large Area Telescope (LAT). CXOU J110926.4-650224 is a newly discovered tMSP candidate in an active X-ray state located close to a faint gamma-ray source, listed in the latest release of the 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. In this study, we present an analysis of Fermi\/LAT data collected from August 2008 to June 2023, for a total of about 15 years, aiming to achieve a more accurate localisation of the gamma-ray source and characterise its spectral properties. By thoroughly reconstructing the gamma-ray background around the source, we obtain a new localisation that matches the position of the X-ray source at the 95% confidence level. This establishes a possible spatial association between the gamma-ray source and CXOU J110926.4-650224.<\/p>\n<p align=\"justify\"><strong>Arianna Manca \u2013 Universit\u00e0 degli Studi di Cagliari<br \/>\n<\/strong><\/p>\n<p align=\"justify\">Arianna Manca earned her PhD in Physics at the University of Cagliari in 2024, where she worked mostly on the spectral analysis of Low-Mass X-ray Binary systems, hosting neutron stars or black holes. As member of the HERMES collaboration, she worked on the localisation of Gamma-Ray Bursts through triangulation techniques. During her stay at the Institute of Space Sciences of Barcelona, she worked on the analysis of gamma-ray data of a candidate transitional pulsar.<\/p>\n","protected":false},"template":"","class_list":["post-4482","seminari","type-seminari","status-publish","hentry","categorie_seminari-colloquium"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari\/4482","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/seminari"}],"about":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/types\/seminari"}],"wp:attachment":[{"href":"https:\/\/www.oa-cagliari.inaf.it\/en\/wp-json\/wp\/v2\/media?parent=4482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}