Following the Colour of the Low Mass X-ray Binary 4U 1820-30 with INTEGRAL

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dc.creatorTarana, Antonella
dc.creatorBazzano, Angela
dc.creatorUbertini, Pietro
dc.creatorZdziarski, A. Andrzej
dc.creatorFederici, M.
dc.date2006-10-11
dc.date.accessioned2026-07-07T07:26:55Z
dc.date.available2026-07-07T07:26:55Z
dc.descriptionThe 4-200 keV spectral and temporal behaviour of the low mass X-ray binary 4U 1820-30 has been studied with INTEGRAL during 2003-2005. This source as been observed in both the soft (banana) and hard (island) spectral states. A high energy tail above 50 keV in the hard state has been revealed for the first time. This places the source in the category of X-ray bursters showing high-energy emission. The tail can be modeled as a soft power law component, with the photon index of ~ 2.4, on top of thermal Comptonization emission from a plasma with the electron temperature of kT_e ~ 6 keV and optical depth of $τ~ 4. Alternatively, but at a lower goodness of the fit, the hard-state broad band spectrum can be accounted for by emission from a hybrid, thermal-nonthermal, plasma. During the observations, the source spent most of the time in the soft state, as previously reported and the $\ge$4 keV spectra can be represented by thermal Comptonization with kT_e ~ 3 keV and $τ~ 6-7.
dc.description4 pages, 3 figures, submitted proceeding of the 6th INTEGRAL Workshop "The Obscured Universe" July 2-8, 2006 Space Research Institute Moscow, Russia
dc.identifierhttps://arxiv.org/abs/astro-ph/0610328
dc.identifierhttp://arxiv.org/abs/astro-ph/0610328
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/117203
dc.subjectAstrophysics
dc.titleFollowing the Colour of the Low Mass X-ray Binary 4U 1820-30 with INTEGRAL
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