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Title: | AstroSat observation of the accreting millisecond X-ray pulsar SAX J1808.4–3658 during its 2019 outburst |
Authors: | Sharma, Rahul Sanna, Andrea Beri, Aru |
Keywords: | accretion accretion disks stars: neutron x-ray: binaries SAX J1808.4–3658 |
Issue Date: | 1-Mar-2023 |
Publisher: | Oxford University Press |
Citation: | Monthly Notices of the Royal Astronomical Society, 2023, Vol. 519, p3811 |
Abstract: | We report on the analysis of the AstroSat data set of the accreting millisecond X-ray pulsar SAX J1808.4–3658, obtained during its 2019 outburst. We found coherent pulsations at ∼401 Hz and an orbital solution consistent with previous studies. The 3–20 keV pulse profile can be well fitted with three harmonically related sinusoidal components with background-corrected fractional amplitudes of ∼3.5 per cent, ∼1.2 per cent and ∼0.37 per cent for the fundamental, second and third harmonics, respectively. Our energy-resolved pulse profile evolution study indicates a strong energy dependence. We also observed a soft lag in the fundamental and hard lags during its harmonic. The broad-band spectrum of SAX J1808.4–3658 can be described well using a combination of the thermal emission component with kT ∼ 1 keV, a thermal Comptonization (Γ ∼ 1.67) from the hot corona and broad emission lines due to Fe. |
Description: | Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations) |
URI: | http://hdl.handle.net/2289/8041 |
ISSN: | 0035-8711 1365-2966 (Online) |
Alternative Location: | https://ui.adsabs.harvard.edu/abs/2023MNRAS.519.3811S/abstract https://arxiv.org/abs/2212.10088 https://doi.org/10.1093/mnras/stac3779 https://inspirehep.net/literature/2616477 |
Copyright: | 2022 The Author(s) |
Appears in Collections: | Research Papers (A&A) |
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2023_MNRAS_Vol.519_p3811.pdf Restricted Access | Restricted Access | 1.41 MB | Adobe PDF | View/Open Request a copy |
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