@Article{MaiolinoDAmiBrag:2013:EvCoUp,
author = "Maiolino, Tais Michele and D'Amico, Fl{\'a}vio and Braga,
Jo{\~a}o",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)}",
title = "INTEGRAL observations of Scorpius X-1: evidence for Comptonization
up to 200 keV",
journal = "Astronomy \& Astrophysics",
year = "2013",
volume = "551",
pages = "L2--L5",
note = "Setores de Atividade: Educa{\c{c}}{\~a}o, Pesquisa e
desenvolvimento cient{\'{\i}}fico.",
keywords = "radiation mechanisms, neutron stars, image processing.",
abstract = "We have analyzed a long-term database for Sco X-1 obtained with
the telescope IBIS onboard the INTEGRAL satellite in order to
study the hard X-ray behavior of Sco X-1 from 20 up to 200 keV.
Besides the data used for producing of the INTEGRAL catalog of
sources, this is the longest (412 ks) database of IBIS on Sco X-1
up to date. The production of hard X-ray tails in low-mass X-ray
binaries is still a matter of debate. Since most of the fits to
the high-energy part of the spectra are done with powerlaw models,
the physical mechanism for the hard X-ray tail production is
unclear. The purpose of this study is to better constrain those
possible mechanisms. Our main result shows a strong correlation
between the fluxes in the thermal and nonthermal part of Sco X-1
spectra. We, thus, suggest that comptonization of lower energy
photons is the mechanism for producing hard X-ray tails in Sco
X-1.",
doi = "10.1051/0004-6361/201220677",
url = "http://dx.doi.org/10.1051/0004-6361/201220677",
issn = "0004-6361 and 1432-0746",
label = "lattes: 0486569206159968 3 MaiolinoDAmiBrag:2013:EvCoUp",
language = "en",
targetfile = "aa20677-12.pdf",
urlaccessdate = "02 maio 2024"
}