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		<doi>10.1051/0004-6361/201220677</doi>
		<issn>0004-6361</issn>
		<issn>1432-0746</issn>
		<label>lattes: 0486569206159968 3 MaiolinoDAmiBrag:2013:EvCoUp</label>
		<citationkey>MaiolinoDAmiBrag:2013:EvCoUp</citationkey>
		<title>INTEGRAL observations of Scorpius X-1: evidence for Comptonization up to 200 keV</title>
		<year>2013</year>
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		<author>Maiolino, Tais Michele,</author>
		<author>D'Amico, Flávio,</author>
		<author>Braga, João,</author>
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		<group>DAS-CEA-INPE-MCTI-GOV-BR</group>
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		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<electronicmailaddress>tais.maiolino@das.inpe.br</electronicmailaddress>
		<electronicmailaddress>damico@das.inpe.br</electronicmailaddress>
		<electronicmailaddress>joao.braga@das.inpe.br</electronicmailaddress>
		<e-mailaddress>joao.braga@das.inpe.br</e-mailaddress>
		<journal>Astronomy & Astrophysics</journal>
		<volume>551</volume>
		<pages>L2-L5</pages>
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		<keywords>radiation mechanisms, neutron stars, image processing.</keywords>
		<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.</abstract>
		<area>CEA</area>
		<language>en</language>
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		<notes>Setores de Atividade: Educação, Pesquisa e desenvolvimento científico.</notes>
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