@Article{DAmicoHeinRothGrub:2001:HiXRTi,
author = "D'Amico, Fl{\'a}vio and Heindl, W. A. and Rothschild, R. E. and
Gruber, D. E",
affiliation = "Univ Calif San Diego, Ctr Astrophys \& Space Sci, La Jolla, USA
and Inst Nacl Pesquisas Espaciais, Divis{\~a}o de
Astrof{\'{\i}}sica",
title = "High-Energy X-Ray Timing Experiment detections of hard X-ray tails
in Scorpius X-1",
journal = "Astrophysical Journal",
year = "2001",
volume = "547",
number = "2 Part 2",
pages = "L147--L150",
month = "Feb.",
keywords = "Astrof{\'{\i}}sica, binaries : general, stars : individual
(Scorpius X 1), stars : neutron, X-rays : stars, performance,
explorer, spectrum.",
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.",
copyholder = "SID/SCD",
issn = "0004-637X and 1538-4357",
language = "en",
targetfile = "High-energy x-ray timing experiment detections of hard x-ray tails
in scorpius x-1.pdf",
urlaccessdate = "2024, May 18"
}