@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 maio 2024"
}