@Article{StecchiniLeãoCastDAmi:2021:BeBlHo,
author = "Stecchini, Paulo Eduardo Freire and Le{\~a}o, Jurandi and Castro,
M. and D'Amico, Fl{\'a}vio",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Estadual
de Campinas (UNICAMP)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "On the behavior of the black hole candidate 1E 1740.7-2942's
corona based on long-term INTEGRAL database",
journal = "Astronomische Nachrichten",
year = "2021",
volume = "342",
number = "1/2",
pages = "315--319",
month = "Jan./Feb.",
keywords = "X-rays: binaries, X-rays: general, black hole physics, surveys.",
abstract = "One of the most straightforward ways to explain the hard X-ray
spectra observed in X-ray binaries is to assume that
comptonization of soft photons from the accretion disk is
occurring. The region where this process takes place, called the
corona, is characterized by only two parameters: its thermal
energy kT and its optical depth \τ. Hard X-ray spectra
analysis is, thus, an imperative tool in diagnosing the behavior
of these parameters. The lack of consistency in
obtaining/analyzing long-term databases, however, may have been
hindering this kind of characterization from being attained. With
the aim of better understanding the corona behavior in the black
hole candidate 1E 1740.7-2942, we performed a homogeneous analysis
for a large hard X-ray data set from the ISGRI telescope on-board
the INTEGRAL satellite. Results from modeling the spectra show
that, for most of our sample, unsaturated thermal comptonization
is the main mechanism responsible for the hard X-ray spectra
observed in 1E 1740.7-2942. Moreover, such extensive database
allowed us to produce what is probably the longest hard X-ray
light curve of 1E 1740.7-2942 and whose unitsdue to recent
findings regarding dynamical quantities of the systemcould be
expressed in % of Eddington's luminosity.",
doi = "10.1002/asna.202113926",
url = "http://dx.doi.org/10.1002/asna.202113926",
issn = "0004-6337",
language = "en",
targetfile = "stecchini_behavior.pdf",
urlaccessdate = "20 set. 2024"
}