A blazar candidate for the Fermi source 4FGL J1848.7–0129

LUQUE ESCAMILLA, P. L.; MARTÍ, JOSEP; MESTRE, ENRIQUE ; COMBI, J. A; ALBACETE COLOMBO, J. F

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

WILEY-BLACKWELL PUBLISHING, INC

Lugar: Londres; Año: 2023 vol. 518 p. 3017 - 3022

0035-8711

The Fermi source 4FGL J1848.7–0129 has been historically related to the globular cluster GLIMPSE-C01 since its very first detection. Although this association is widely accepted, as it appears in the most recent Fermi catalog, it deserves to be revisited gi v en the multiwavelength evidence and the recent disco very of variable X-ray sources in the Fermi source region. In particular, low-frequency radio maps from the Giant Metre Radio Telescope in Pune (India) have been carefully inspected which, together with X-ray data re-analysis from Chandra, lead us to get a deep insight into the candidates to be associated with 4FGL J1848.7–0129. This results in the discovery of a new X-ray variable point source coincident with an unreported non-thermal radio emitter, both of them well inside the 4FGL J1848.7–0129 error ellipse. We analyze and discuss all these observational facts, and we propose now a newly discovered blazar candidate as the most promising responsible for the gamma-ray emission in the Fermi source. If confirmed, this result would set constraints on the number of millisecond pulsars in GLIMPSE-C01 or their gamma-ray emission properties.