Discovery of two new millisecond pulsars toward the Galactic bulge
Year: 2026
Type: article
Abstract: Aims . The mysterious Galactic center (GC) gamma-ray ( γ -ray) excess (GCE) could be explained by a large population of millisecond pulsars (MSPs) hiding in the Galactic bulge, too faint to be detected as individual high-energy point sources by the Fermi Large Area Telescope and too fast and dispersed to be detected in shallow radio pulsation surveys. Methods . Motivated by an innovative candidate selection method, we aim to detect millisecond pulsars associated with the GCE by carrying out deep radio pulsation searches toward promising candidates detected in the inner Galaxy in X rays by Chandra and in radio or γ rays by the Very Large Array or Fermi . Results . We conducted deep radio observation and follow-up campaigns with MeerKAT, as well as the Murriyang and Green Bank telescopes toward nine X-ray candidate sources. Conclusions . We report the detection of two new MSPs, including a black widow candidate, toward the Galactic bulge: PSRs J1740-2805 and J1740-28. These discoveries double the number of MSPs discovered within the innermost 2° from the GC.
Source: Astronomy and Astrophysics
Authors: J. Berteaud, F. Calore, M. Clavel, S. Dai, J. S. Deneva, S. Hyman, F. K. Schinzel, A. Ridolfi, S. M. Ransom, F. Abbate, C. J. Clark, M. Kramer, T. Thongmeearkom, B. W. Stappers, E. D. Barr, R. P. Breton
Institutions: Goddard Space Flight Center, University of Maryland, College Park, Centre National de la Recherche Scientifique, Laboratoire d'Annecy de Physique Théorique, Institut de Planétologie et d'Astrophysique de Grenoble, Université Grenoble Alpes, Commonwealth Scientific and Industrial Research Organisation, Australia Telescope National Facility, Western Sydney University, George Mason University, Sweet Briar College, National Radio Astronomy Observatory, Bielefeld University, Osservatorio Astronomico di Cagliari, Max Planck Institute for Radio Astronomy, National Institute for Astrophysics, Leibniz University Hannover, Max Planck Institute for Gravitational Physics, University of Manchester, National Astronomical Research Institute of Thailand
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,865
Funders: National Science Foundation, National Aeronautics and Space Administration, Canadian Institute for Advanced Research, Australian Government, Commonwealth Scientific and Industrial Research Organisation, National Research Foundation, Agence Nationale de la Recherche, Centre National d’Etudes Spatiales, Max-Planck-Gesellschaft, Centre National de la Recherche Scientifique, Goddard Space Flight Center, Institut National de Physique Nucléaire et de Physique des Particules
OpenAlex ID: W4417530979
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