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http://hdl.handle.net/20.500.12386/31383
Title: | Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL/IBIS | Authors: | FIOCCHI, MARIATERESA ONORI, FRANCESCA BAZZANO, ANGELA Bird, A. J. Bodaghee, A. Charles, P. A. Lepingwell, V. A. Malizia, A. Masetti, N. Natalucci, L. Ubertini, P. |
Issue Date: | 2020 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 492 | Issue: | 3 | First Page: | 3657 | Abstract: | We report on a recent bright outburst from the new X-ray binary transient MAXI J1631-479, observed in January 2019. In particular, we present the 30-200 keV analysis of spectral transitions observed with INTEGRAL/IBIS during its Galactic plane monitoring program. In the MAXI and BAT monitoring period, we observed two different spectral transitions between the high/soft and low/hard states. The INTEGRAL spectrum from data taken soon before the second transition is best described by a Comptonized thermal component with a temperature of kT<SUB>e</SUB> ∼ 30 keV and a high-luminosity value of L_{2-200 keV}∼ 3× 10^{38} erg<SUP>-1</SUP> (assuming a distance of 8 kpc). During the second transition, the source shows a hard, power-law spectrum. The lack of high energy cut-off indicates that the hard X-ray spectrum from MAXI J1631-479 is due to a non-thermal emission. Inverse Compton scattering of soft X-ray photons from a non-thermal or hybrid thermal/non-thermal electron distribution can explain the observed X-ray spectrum although a contribution to the hard X-ray emission from a jet cannot be determined at this stage. The outburst evolution in the hardness-intensity diagram, the spectral characteristics, and the rise and decay times of the outburst are suggesting that this system is a black hole candidate. | URI: | http://hdl.handle.net/20.500.12386/31383 | URL: | https://academic.oup.com/mnras/article/492/3/3657/5700724?login=true | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/staa068 | Bibcode ADS: | 2020MNRAS.492.3657F | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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staa068.pdf | Pdf editoriale | 547.2 kB | Adobe PDF | View/Open |
2001.03034.pdf | preprint | 447.74 kB | Adobe PDF | View/Open |
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