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		<issn>0004-637X</issn>
		<issn>1538-4357</issn>
		<citationkey>DAmicoHeinRothGrub:2001:HiXRTi</citationkey>
		<title>High-Energy X-Ray Timing Experiment detections of hard X-ray tails in Scorpius X-1</title>
		<year>2001</year>
		<month>Feb.</month>
		<typeofwork>journal article</typeofwork>
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		<author>D'Amico, Flávio,</author>
		<author>Heindl, W. A.,</author>
		<author>Rothschild, R. E.,</author>
		<author>Gruber, D. E,</author>
		<group>DAS-INPE-MCT-BR</group>
		<affiliation>Univ Calif San Diego, Ctr Astrophys & Space Sci, La Jolla, USA</affiliation>
		<affiliation>Inst Nacl Pesquisas Espaciais, Divisão de Astrofísica</affiliation>
		<electronicmailaddress>fdamico@ucsd.edu</electronicmailaddress>
		<electronicmailaddress>wheindl@ucsd.edu</electronicmailaddress>
		<electronicmailaddress>rrothschild@ucsd.edu</electronicmailaddress>
		<electronicmailaddress>dgruber@ucsd.edu</electronicmailaddress>
		<journal>Astrophysical Journal</journal>
		<volume>547</volume>
		<number>2 Part 2</number>
		<pages>L147-L150</pages>
		<transferableflag>1</transferableflag>
		<contenttype>External Contribution</contenttype>
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		<keywords>Astrofísica, binaries : general, stars : individual (Scorpius X 1), stars : neutron, X-rays : stars, performance, explorer, spectrum.</keywords>
		<abstract>We report the detection of a nonthermal hard X-ray component from Sco X-1 based on the analysis of 20-220 keV spectra obtained with the High-Energy X-Ray Timing Experiment on board the Rossi X-Ray Timing Explorer satellite. We find that the addition of a power-law component to a thermal bremsstrahlung model is required to achieve a good fit in five of 16 observations analyzed. Using Proportional Counter Array data, we were able to track the movement of the source along the Z diagram, and we found that the presence of the hard X-ray tail is not confined to a specific Z position. However, we do observe an indication that the power-law index hardens with increasing M, as indicated from the position on the Z diagram. We find that the derived nonthermal luminosities are similar to 10% of that derived for the brightest of the atoll sources.</abstract>
		<area>CEA</area>
		<language>en</language>
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