2023
DOI: 10.1051/0004-6361/202243564
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INTEGRAL study of MAXI J1535−571, MAXI J1820+070, and MAXI J1348 − 630 outbursts

Abstract: In black hole X-ray binaries, a nonthermal high-energy component is sometimes detected at energies above 200 keV. The origin of this high-energy component is debated and distinct spectral modelizations can lead to different interpretations. High-energy polarimetry measurements with the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) enable new diagnostics on the physics responsible for the MeV spectral component in black hole X-ray binaries. In this work, we aim to investigate the high-energy behavi… Show more

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Cited by 8 publications
(6 citation statements)
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“…From this asymmetry in angle distribution, we can deduce the Polarization Angle: 𝑃 𝐴 = 𝜙 0 − 𝜋/2, and the Polarization Fraction: 𝑃𝐹 = 𝑎 0 /𝑎 100 with 𝑎 100 the amplitude for a fully polarized source (computed through simulations). This method has been applied for several sources before [2][3][4] and gave compatible results with other observatories at different wavelengths.…”
Section: Compton Mode and Polarizationmentioning
confidence: 72%
“…From this asymmetry in angle distribution, we can deduce the Polarization Angle: 𝑃 𝐴 = 𝜙 0 − 𝜋/2, and the Polarization Fraction: 𝑃𝐹 = 𝑎 0 /𝑎 100 with 𝑎 100 the amplitude for a fully polarized source (computed through simulations). This method has been applied for several sources before [2][3][4] and gave compatible results with other observatories at different wavelengths.…”
Section: Compton Mode and Polarizationmentioning
confidence: 72%
“…The first scenario considers the synchrotron spectrum from the jet base (Markoff et al 2005;Laurent et al 2011;Jourdain et al 2014;Rodriguez et al 2015;Kantzas et al 2021). The high polarization degree of the high-energy tail detected in Cyg X-1 and MAXI J1348-630 is consistent with the emission from the compact jet of these sources (Jourdain et al 2012;Cangemi et al 2023). The alternative scenario suggests that the high-energy tail arises from a hybrid thermal/nonthermal Comptonization in a plasma with a nonthermal electron distribution.…”
Section: Discussionmentioning
confidence: 83%
“…In the HS and HIMS, the spectra of BH-LMXBs are usually dominated by a hard power-law component, which is believed to originate from the thermal Comptonization of soft disk photons by hot electrons in the corona/jet base. In addition to the standard hard power-law component, a high-energy hard tail is sometimes observed in the spectra of BH-LMXBs (e.g., Cadolle Bel et al 2006;Zdziarski et al 2021;Cangemi et al 2023). The physical origin of the hard tail is still under debate.…”
Section: Discussionmentioning
confidence: 99%
“…Broadband spectral analyses have been performed of J1820ʼs outburst in 2018. However, these analyses only sampled isolated epochs of the outburst, focusing mainly on the hard state (e.g., Rodi et al 2021, on April 12), and/or a limited region of the electromagnetic spectrum (e.g., Shidatsu et al 2018Shidatsu et al , 2019Bharali et al 2019;Chakraborty et al 2020;Marino et al 2021;Özbey Arabacıet al 2022;Prabhakar et al 2022;Cangemi et al 2023). In this work, we characterize the broadband spectrum (from the radio to X-ray bands) of J1820 over the course of its full 2018 outburst, a period summarized in Figure 1.…”
Section: Notesmentioning
confidence: 99%