A new X-ray outburst in the globular cluster NGC 6440: SAX J1748.9-2021

Simple item page
dc.creatorZand, J. J. M. in 't
dc.creatorVerbunt, F.
dc.creatorStrohmayer, T. E.
dc.creatorBazzano, A.
dc.creatorCocchi, M.
dc.creatorHeise, J.
dc.creatorvan Kerkwijk, M. H.
dc.creatorMuller, J. M.
dc.creatorNatalucci, L.
dc.creatorSmith, M. J. S.
dc.creatorUbertini, P.
dc.date1999-02-23
dc.date.accessioned2026-07-07T02:30:34Z
dc.date.available2026-07-07T02:30:34Z
dc.descriptionFor the second time in 27 years a bright transient X-ray source has been detected coincident with the globular cluster NGC 6440. It was found to be active in August, 1998, with the Wide Field Camera and the narrow field instruments on the BeppoSAX spacecraft, and with the All-Sky Monitor and the Proportional Counter Array on the RossiXTE spacecraft. Four X-ray bursts were detected, at least one of which shows the characteristics of a thermonuclear flash on a neutron star, in analogy with some ~20 optically identified low-mass X-ray binaries. The broad-band spectrum is hard as is common among low-mass X-ray binaries of lower luminosity (>~10^37 erg/s) and can be explained by a Comptonized model. During the burst the >30 keV emission brightened, consistent with part of the burst emission being Compton up scattered within ~10^11 cm.
dc.description10 pages, accepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9902319
dc.identifierhttp://arxiv.org/abs/astro-ph/9902319
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13856
dc.subjectAstrophysics
dc.titleA new X-ray outburst in the globular cluster NGC 6440: SAX J1748.9-2021
dc.typetext

Files

Collections

arXiv