49 citations · 322 across the 17 of their papers we have counts for
17 papers
Evolution of the Comptonizing medium of the black-hole candidate Swift J1727.81613 along the hard to hard-intermediate state transition using NICER
Divya Rawat, Mariano Méndez, Federico García +1
We analyse the properties of the Comptonizing medium in the black-hole X-ray binary Swift J1727.81613 using the time-dependent Comptonization model vkompth, using NICER observat…
Spectropolarimetric study of 4U 163047 in Steep Power law state with IXPE and NICER
Divya Rawat, Akash Garg, Mariano Méndez
We probe the spectropolarimetric properties of the black-hole binary source 4U 163047 in the steep power law state. We detect a significant polarization fraction of 7 % at…
Testing the dynamic origin of Quasi-periodic Oscillations in MAXI J1535-571 and H 1743-322
Divya Rawat, Nazma Husain, Ranjeev Misra
We investigate spectro-temporal properties for two black hole X-ray binary sources, MAXI J1535571 and H 1743322, during their hard and hard-intermediate states. For MAXI J153…
Symmetry breaking and structure instability in ultra-thin 2H-TaS2 across charge density wave transition
Divya Rawat, Aksa Thomas, Ajay Soni
Ultra-thin 2D materials have shown complete paradigm shift of understanding of physical and electronic properties because of confinement effects, symmetry breaking and novel phenom…
Evolution of QPOs in GX 339-4 and EXO 1846-031 with Insight-HXMT and NICER
Zuobin Zhang, Honghui Liu, Divya Rawat +6
We conduct a spectral and timing analysis of GX 339-4 and EXO 1846-031 with the aim of studying the evolution of Type-C QPOs with spectral parameters. The high cadence data from In…
Flux-resolved Spectropolarimetric Evolution of the X-Ray Pulsar Hercules X-1 Using IXPE
Akash Garg, Divya Rawat, Yash Bhargava +2
We conduct a spectro-polarimetric study of the accreting X-ray pulsar Hercules X-1 using observations with the Imaging X-ray Polarimetry Explorer (IXPE). IXPE monitored the source…
Detection of X-ray polarized emission and accretion-disk winds with IXPE and NICER in the black-hole X-ray binary 4U 1630-47
Divya Rawat, Akash Garg, Mariano Méndez
We detect a high level of polarization in the X-ray emission of the black-hole binary 4U 1630-47 in an observation with the Imaging X-ray Polarimetry Explorer. The 2-8 keV polariza…
A NICER look at the jet-like corona of MAXI J1535-571 through type-B quasi-periodic oscillations
Yuexin Zhang, Mariano Méndez, Federico García +7
MAXI J1535-571 is a black-hole X-ray binary that in 2017 exhibited a very bright outburst which reached a peak flux of up to 5 Crab in the 2-20 keV band. Given the high flux, sever…
The comptonizing medium of the black-hole X-ray binary MAXI~J1535571 through type-C quasi-periodic oscillations
Divya Rawat, Mariano Méndez, Federico García +7
We present a detailed spectral and temporal analysis of the black-hole candidate MAXI~J1535571 using NICER observations in September and October 2017. We focus specifically on o…
Anisotropic Light-Matter Interactions in Single Crystal Topological Insulator Bismuth Selenide
Divya Rawat, Aditya Singh, Niraj Kumar Singh +1
Anisotropy of light-matter interactions in materials give remarkable information about the phonons and their interactions with electrons. We report the angle-resolved polarized Ram…
The evolution of the corona in MAXI J1535-571 through type-C quasi-periodic oscillations with Insight-HXMT
Yuexin Zhang, Mariano Méndez, Federico García +14
Type-C quasi-periodic oscillations (QPOs) in black hole X-ray transients can appear when the source is in the low-hard and hard-intermediate states. The spectral-timing evolution o…
Time-resolved spectroscopy on the heartbeat state of GRS 1915+105 using AstroSat
Divya Rawat, Ranjeev Misra, Pankaj Jain +1
AstroSat spectra of the black hole system GRS 1915+105 during the heartbeat state (with a varying oscillation period from 150 to 100 secs) were analysed using a truncated relativis…
Electron-Phonon Coupling and Quantum Correction to Topological Magnetoconductivity in Bi2GeTe4
Niraj Kumar Singh, Divya Rawat, Dibyendu Dey +5
We report on structure, vibrational properties and weak-antilocalization-(WAL-) induced quantum correction to magnetoconductivity in single crystal Bi2GeTe4. Surface band structure…
Testing evolution of LFQPOs with mass accretion rate in GRS 1915+105 with Insight-HXMT
Honghui Liu, Long Ji, Cosimo Bambi +5
Using the Insight-HXMT observations of GRS 1915+105 when it exhibits low frequency quasi-periodic oscillations (QPOs), we measure the evolution of the QPO frequency along with disk…
Identification of QPO frequency of GRS 1915+105 as the relativistic dynamic frequency of a truncated accretion disk
Ranjeev Misra, Divya Rawat, J S Yadav +1
We have analyzed AstroSat observations of the galactic micro-quasar system GRS 1915+105, when the system exhibited C-type Quasi-periodic Oscillations (QPOs) in the frequency range…
Study of timing evolution from non-variable to structured large-amplitude variability transition in GRS 1915+105 using AstroSat
Divya Rawat, Mayukh Pahari, J S Yadav +6
In this work, we present a 90 ks continuous monitoring of the Galactic micro-quasar GRS 1915+105 with AstroSat when the source undergoes a major transition from a non-variabl…
Extensive broadband X-ray monitoring during the formation of a giant radio jet base in Cyg X-3 with AstroSat
Mayukh Pahari, J S Yadav, Jai Verdhan Chauhan +9
We present X-ray spectral and timing behavior of Cyg X-3 as observed by AstroSat during the onset of a giant radio flare on 01-02 April 2017. Within a time-scale of few hours, the…