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Title:
An Unusual X-Ray Burst from the Globular Cluster M28
Authors:
Gotthelf, E. V.; Kulkarni, S. R.
Publication:
Astrophysical Journal Letters v.490, p.L161 (ApJL Homepage)
Publication Date:
12/1997
Origin:
APJ
ApJ Keywords:
GALAXY: GLOBULAR CLUSTERS: INDIVIDUAL MESSIER NUMBER: M28, STARS: INDIVIDUAL ALPHANUMERIC: PSR 1821-24, STARS: NEUTRON, X-RAYS: BURSTS, X-RAYS: STARS
Bibliographic Code:
1997ApJ...490L.161G

Abstract

We report the discovery of an unusual X-ray burst from the direction of the globular cluster M28 using data acquired with ASCA. The burst was recorded by all four ASCA telescopes and displays a fast (<~70 ms) rise followed by an exponential decay ( tau =7.5 s) and a steady afterglow that lasts between 800 and 3250 s. The image of the burst is consistent with an ASCA point source and is centered on quiescent X-ray emission from the core of M28. The burst temporal profile is similar to type I bursts emitted by accreting neutron stars of low-mass X-ray binaries (LMXBs). We argue that the burst arises from a LMXB that is located in the core of M28. The burst is unique in two ways: it is intrinsically subluminous, ~0.02LE, and more importantly it originates from a source whose quiescent luminosity is fainter than that of the known cluster bursters by 3 orders of magnitude. We suggest that this burst is from a highly magnetized neutron star accreting at a low rate. These accreting systems may account for the mysterious low-luminosity X-ray sources in globular clusters.
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