AstroSat Observation of 2016 Outburst of H 1743-322
Swadesh Chand, V. K. Agrawal, G. C. Dewangan, Prakash Tripathi and, Parijat Thakur

TL;DR
This paper reports the detection of type C QPOs and harmonic features in AstroSat data of H 1743-322 during its 2016 outburst, revealing energy-independent QPO frequencies, a low/hard state, and accretion flow fluctuations.
Contribution
First detection of specific QPO features in AstroSat data of H 1743-322, highlighting geometrical changes and accretion dynamics during outburst.
Findings
QPO and harmonic frequencies shifted compared to later observations
QPO centroid frequency is energy-independent
Detected hard lag of ~21 ms indicating accretion flow propagation
Abstract
We present the detection of type C quasi-periodic oscillation (QPO) along with upper harmonic at respective frequencies of Hz and Hz in the single AstroSat observation taken during the 2016 outburst of the low-mass black hole X-ray binary H~1743--322. These frequencies are found to be shifted by Hz for the QPO and Hz for the upper harmonic with respect to that found in the simultaneous \textit{XMM-Newton} and \textit{NuSTAR} observation taken five days later than the AstroSat observation, indicating a certain geometrical change in the system. However, the centroid frequency of the QPO and the upper harmonic do not change with energy, indicating the energy-independent nature. The decreasing trend in the fractional rms of the QPO with energy is consistent with the previous results for this source in the low/hard state. The value of the photon index…
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Taxonomy
TopicsAstrophysical Phenomena and Observations · Astrophysics and Cosmic Phenomena · Pulsars and Gravitational Waves Research
