| Autor: |
Soonthornthum, B., Malasan, H.L., Chey, C.O., Abu Kassim, H., Myint, K.S., Celebre, C., Diep, P.N., Yang, A., Alfarizki, Fahmi Iman, Vierdayanti, Kiki |
| Předmět: |
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| Zdroj: |
EPJ Web of Conferences; 8/21/2020, Vol. 240, p1-10, 10p |
| Abstrakt: |
Investigation of spectral evolution of four black hole candidates was carried out by using color-color diagram as well as spectral fitting on Swift/XRT data. Newly found candidates, which are classified as low-mass X-ray binary system based on their transient nature, are the focus of our work. We compare their spectral evolutions to that of XTE J1752-223, a transient system and a more convincing black hole candidate whose mass has been determined from spectral-timing correlation scaling. In addition, comparison to Cygnus X-1, a well-known stellar-mass black hole, was done despite its persistent nature. The spectral fitting, by using a combination of thermal disk and non-thermal component model, results in the innermost temperature values in the range of the typical innermost temperature of black hole binary which is 0.7 – 1.5 keV. The spectral evolutions of the candidates bear a resemblance to both Cygnus X-1 and XTE J1752-223. We note that during Swift/XRT observations, the spectra of Cygnus X-1 and IGR J17451-3022 are mostly dominated by the non- thermal component. We conclude that the compact object of MAXI J1535- 571 and MAXI J1828-249 is highly likely to be a black hole. However, the lack of data rendered conclusive result impossible for IGR J17454-2919. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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