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- W2897930672 abstract "SAX J1748.9–2021 is a transiently accreting X-ray millisecond pulsar. It is also known as an X-ray burster source discovered by Beppo- SAX. We analyzed the persistent emission and type-I X-ray burst properties during its 2015 outburst. The source changed from hard to soft state within half day. We modeled the broadband spectra of the persistent emission in the (1–250) keV energy band for both spectral states using the quasi-simultaneous INTEGRAL and S wift data. The broadband spectra are well fitted by an absorbed thermal Componization model, COMPPS , in a slab geometry. The best-fits for the two states indicate significantly different plasma temperature of 18 and 5 keV and the Thomson optical depths of three and four, respectively. In total, 56 type-I X-ray bursts were observed during the 2015 outburst, of which 26 detected by INTEGRAL in the hard state, 25 by X MM-Newton in the soft state, and five by S wift in both states. As the object transited from the hard to the soft state, the recurrence time for X-ray bursts decreased from ≈2 to ≈1 h. The relation between the recurrence time, Δ t rec , and the local mass accretion rate per unit area onto the compact object, ṁ , is fitted by a power-law model, and yielded as best fit at Δ t rec ∼ ⟨ ṁ ⟩ −1.02±0.03 using all X-ray bursts. In both cases, the observed recurrence times are consistent with the mixed hydrogen and helium bursts. We also discuss the effects of type-I X-ray bursts prior to the hard to soft transition." @default.
- W2897930672 created "2018-10-26" @default.
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- W2897930672 date "2018-12-01" @default.
- W2897930672 modified "2023-10-02" @default.
- W2897930672 title "Mixed H/He bursts in SAX J1748.9–2021 during the spectral change of its 2015 outburst" @default.
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- W2897930672 doi "https://doi.org/10.1051/0004-6361/201833857" @default.
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