The globular cluster NGC 6388: $XMM$-Newton and $Chandra$ observations

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dc.creatorNucita, A. A.
dc.creatorDe Paolis, F.
dc.creatorIngrosso, G.
dc.creatorCarpano, S.
dc.creatorGuainazzi, M.
dc.date2007-12-07
dc.date2007-12-17
dc.date.accessioned2026-07-07T08:49:12Z
dc.date.available2026-07-07T08:49:12Z
dc.descriptionBy studying the optical brightness surface density of the globular cluster NGC 6388, it has been recently proposed that it harbors a central intermediate-mass black hole with mass $\simeq 5.7\times 10^3$ M$_{\odot}$. We expect that the compact object in the center of NGC 6388 emits radiation in the $X$-ray band as a consequence of the accretion from the surrounding matter. We searched for $XMM$-Newton and $Chandra$ observations towards NGC 6388 to test this hypothesis. The $Chandra$ satellite disentangles several point-like $X$-ray sources, probably low mass $X$-ray binaries, well within the core radius of the globular cluster. However, three of them, coinciding with the cluster center of gravity, remain unresolved. Their total luminosity is $L_X^{Obs}\simeq 2.7\times 10^{33}$ erg s$^{-1}$. If one of these sources is the $X$-ray counterpart of the intermediate-mass black hole in NGC 6388, the corresponding upper limit on the accretion efficiency, with respect to the Eddington luminosity, is $3\times 10^{-9}$. This measurement could be tightened if moderately deep radio observations of the field were performed.
dc.descriptionaccepted on A&A, some references modified
dc.identifierhttps://arxiv.org/abs/0712.1134
dc.identifierhttp://arxiv.org/abs/0712.1134
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/144216
dc.subjectAstrophysics
dc.titleThe globular cluster NGC 6388: $XMM$-Newton and $Chandra$ observations
dc.typetext

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