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

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arxiv astro-ph/9902319 v1 pith:7KILSW6F submitted 1999-02-23 astro-ph

J.J.M. in 't Zand , F. Verbunt , T.E. Strohmayer , A. Bazzano , M. Cocchi , J. Heise , M.H. van Kerkwijk , J.M. Muller
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L. Natalucci M.J.S. Smith P. Ubertini
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keywords x-raybinariesburstclusterdetectedemissionfieldglobular
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For 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.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 10 citations worldwide. Full citation record

  1. An Elaborate Search for Coherent Pulsations from Intermittent-AMXPs

    astro-ph.HE 2025-02 conditional novelty 5.0 of 10

    A systematic Z1^2 and maximum-likelihood search of RXTE data finds dozens of intermittent pulse candidates in three accreting millisecond pulsars and derives an 8.76 h orbital period for SAX J1748.9-2021.

  2. Tracing the outburst decay of soft X-ray transients Aql X-1 and 4U 1608-52 with XSPECT

    astro-ph.HE 2026-05 unverdicted novelty 4.0 of 10

    XSPECT observations of two soft X-ray transients during outburst decay reveal superburst evolution with cooling blackbody emission and a flux-dependent hardening of Comptonized spectra.

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