Divya Rawat
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View article: Contemporaneous X-Ray and Optical Polarization of Extremely High-synchrotron-peaked Blazar H 1426+428
Contemporaneous X-Ray and Optical Polarization of Extremely High-synchrotron-peaked Blazar H 1426+428 Open
We present the first contemporaneous X-ray and optical polarimetric measurement of the extremely high-synchrotron-peaked (HSP) blazar H 1426+428. The X-ray polarimetric observations were undertaken using the Imaging X-ray Polarimetry Explo…
View article: Contemporaneous X-ray and Optical Polarization of EHSP Blazar H 1426+428
Contemporaneous X-ray and Optical Polarization of EHSP Blazar H 1426+428 Open
We present the first contemporaneous X-ray and optical polarimetric measurement of the extremely high synchrotron peaked (EHSP) blazar H 1426+428. The X-ray polarimetric observations were undertaken using the Imaging X-ray Polarimetry Expl…
View article: Evolution of the Comptonizing medium of the black-hole candidate Swift J1727.8–1613 along the hard to hard-intermediate state transition using NICER
Evolution of the Comptonizing medium of the black-hole candidate Swift J1727.8–1613 along the hard to hard-intermediate state transition using NICER Open
We analyse the properties of the Comptonizing medium in the black-hole X-ray binary Swift J1727.8−1613 using the time-dependent Comptonization model vkompth, applied to NICER observations of type-C QPOs in the hard and hard-intermediate st…
View article: Evolution of QPOs in GX 339–4 and EXO 1846–031 with Insight-HXMT and NICER
Evolution of QPOs in GX 339–4 and EXO 1846–031 with Insight-HXMT and NICER Open
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 quasiperiodic oscillations (QPOs) with spectral parameters. The high-cadence data from Insight-HXMT and NICER allow us …
View article: Unveiling the X-ray polarimetric properties of LMC X−3 with <i>IXPE, NICER</i>, and <i>Swift</i>/XRT
Unveiling the X-ray polarimetric properties of LMC X−3 with <i>IXPE, NICER</i>, and <i>Swift</i>/XRT Open
The incoming Imaging X-ray Polarimetry Explorer (IXPE) observations of X-ray binaries provide a new tool to investigate the underlying accretion geometry. Here, we report the first measurements of X-ray polarization of the extragalactic bl…
View article: Unveiling the X-ray polarimetric properties of LMC X-3 with IXPE, NICER, and Swift/XRT
Unveiling the X-ray polarimetric properties of LMC X-3 with IXPE, NICER, and Swift/XRT Open
The incoming Imaging X-ray Polarimetry Explorer (IXPE) observations of X-ray binaries provide a new tool to investigate the underlying accretion geometry. Here we report the first measurements of X-ray polarization of the extra-galactic bl…
View article: Spectropolarimetric study of 4U 1630−47 in steep power-law state with <i>IXPE</i> and <i>NICER</i>
Spectropolarimetric study of 4U 1630−47 in steep power-law state with <i>IXPE</i> and <i>NICER</i> Open
We probe the spectropolarimetric properties of the black hole binary source 4U 1630−47 in the steep power-law state. We detect a significant polarization fraction of ∼7 per cent at a polarization angle of ∼21°. The 2–12 keV NICER spectrum …
View article: Spectropolarimetric study of 4U 1630$-$47 in Steep Power law state with IXPE and NICER
Spectropolarimetric study of 4U 1630$-$47 in Steep Power law state with IXPE and NICER Open
We probe the spectropolarimetric properties of the black-hole binary source 4U 1630$-$47 in the steep power law state. We detect a significant polarization fraction of $\sim$7 % at a polarization angle of $\sim$21 $^\circ$. The $2-12$ keV …
View article: Testing the dynamic origin of Quasi-periodic Oscillations in MAXI J1535-571 and H 1743-322
Testing the dynamic origin of Quasi-periodic Oscillations in MAXI J1535-571 and H 1743-322 Open
We investigate spectro-temporal properties for two black hole X-ray binary sources, MAXI J1535$-$571 and H 1743$-$322, during their hard and hard-intermediate states. For MAXI J1535$-$571, we analyze Swift/XRT, NuSTAR and NICER observation…
View article: Detection of X-Ray Polarized Emission and Accretion-disk Winds with IXPE and NICER in the Black Hole X-Ray Binary 4U 1630−47
Detection of X-Ray Polarized Emission and Accretion-disk Winds with IXPE and NICER in the Black Hole X-Ray Binary 4U 1630−47 Open
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 polarization degree is 8% at a position angle of 18°, with the pola…
View article: Evolution of QPOs in GX 339-4 and EXO 1846-031 with Insight-HXMT and NICER
Evolution of QPOs in GX 339-4 and EXO 1846-031 with Insight-HXMT and NICER Open
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 Insight-HXMT and NICER allow us to track them. Type-C QPOs ap…
View article: Flux-resolved Spectropolarimetric Evolution of the X-Ray Pulsar Hercules X-1 Using IXPE
Flux-resolved Spectropolarimetric Evolution of the X-Ray Pulsar Hercules X-1 Using IXPE Open
We conduct a spectropolarimetric study of the accreting X-ray pulsar Hercules X-1 using observations with the Imaging X-ray Polarimetry Explorer (IXPE). IXPE monitored the source in three different epochs, sampling two “Main-on” and one “S…
View article: Flux-resolved Spectropolarimetric Evolution of the X-Ray Pulsar Hercules X-1 Using IXPE
Flux-resolved Spectropolarimetric Evolution of the X-Ray Pulsar Hercules X-1 Using IXPE Open
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 in three different Epochs, sampling two Main-on and one Sho…
View article: Detection of X-ray polarized emission and accretion-disk winds with IXPE and NICER in the black-hole X-ray binary 4U 1630-47
Detection of X-ray polarized emission and accretion-disk winds with IXPE and NICER in the black-hole X-ray binary 4U 1630-47 Open
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 polarization degree is 8 % at a position angle of $18^\circ$, with …
View article: A<i>NICER</i>look at the jet-like corona of MAXI J1535−571 through type-B quasi-periodic oscillations
A<i>NICER</i>look at the jet-like corona of MAXI J1535−571 through type-B quasi-periodic oscillations Open
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, several X-ray space observatories obtained unprecedented high si…
View article: A NICER look at the jet-like corona of MAXI J1535-571 through type-B quasi-periodic oscillations
A NICER look at the jet-like corona of MAXI J1535-571 through type-B quasi-periodic oscillations Open
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, several X-ray space observatories obtained unprecedented high si…
View article: The comptonizing medium of the black-hole X-ray binary MAXI~J1535$-$571 through type-C quasi-periodic oscillations
The comptonizing medium of the black-hole X-ray binary MAXI~J1535$-$571 through type-C quasi-periodic oscillations Open
We present a detailed spectral and temporal analysis of the black-hole candidate MAXI~J1535$-$571 using NICER observations in September and October 2017. We focus specifically on observations in the hard-intermediate state when the source …
View article: The comptonizing medium of the black hole X-ray binary MAXI J1535−571 through type-C quasi-periodic oscillations
The comptonizing medium of the black hole X-ray binary MAXI J1535−571 through type-C quasi-periodic oscillations Open
We present a detailed spectral and temporal analysis of the black hole candidate MAXI J1535−571 using NICER observations in 2017 September and October. We focus specifically on observations in the hard-intermediate state when the source sh…
View article: Efficient Feature Extraction for Recognition of Human Emotions through Facial Expressions Using Image Processing Algorithms
Efficient Feature Extraction for Recognition of Human Emotions through Facial Expressions Using Image Processing Algorithms Open
Face emotion recognition is a challenging problem in computer vision that has been extensively studied in recent years. The project investigates the performance of Local Binary Pattern (LBP), Histogram of Oriented Gradients (HOG), K- Neare…
View article: Anisotropic Light-Matter Interactions in Single Crystal Topological Insulator Bismuth Selenide
Anisotropic Light-Matter Interactions in Single Crystal Topological Insulator Bismuth Selenide Open
Anisotropy of light-matter interactions in materials give remarkable information about the phonons and their interactions with electrons. We report the angle-resolved polarized Raman spectroscopy of single-crystal of Bi2Se3 to obtain the e…
View article: Antimicrobial activity of A. paniculata against isolated MDR strains
Antimicrobial activity of A. paniculata against isolated MDR strains Open
Antibiotic resistance is a major problem and the greatest challenge to both hospitals and in the community. Initially, antibiotic-resistant strains were found to the hospital environment only, but now they can be present everywhere. It was…
View article: The evolution of the corona in MAXI J1535−571 through type-C quasi-periodic oscillations with <i>Insight</i>-HXMT
The evolution of the corona in MAXI J1535−571 through type-C quasi-periodic oscillations with <i>Insight</i>-HXMT Open
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 of the type-C QPO in MAXI J1535−571 has been recently studie…
View article: Time-resolved spectroscopy on the heartbeat state of GRS 1915+105 using <i>AstroSat</i>
Time-resolved spectroscopy on the heartbeat state of GRS 1915+105 using <i>AstroSat</i> Open
AstroSat spectra of the black hole system GRS 1915+105 during the heartbeat state (with a varying oscillation period from 150 to 100 s) were analysed using a truncated relativistic disc model along with a Comptonization component. Spectra …
View article: Role of the acoustic parameters of voice in forensic investigation: A community based exploratory study
Role of the acoustic parameters of voice in forensic investigation: A community based exploratory study Open
Identification of an efficient parameter of voice for forensic investigation is a challenging task. The process of speech investigation includes examination of the speech profile which helps in the recognizing the suspect. The fundamental …
View article: Relationship between listening, speech and language, cognition and pragmatic skill in children with cochlear implant
Relationship between listening, speech and language, cognition and pragmatic skill in children with cochlear implant Open
Purpose: Previous literature has reported early identification and treatment of hearing loss has a positive effect on overall speech and language development, social skill, cognitive skill as well as pragmatic skill. Present study aimed to…
View article: Extensive Broadband X-Ray Monitoring During the Formation of a Giant Radio Jet Base in Cyg X-3 with AstroSat
Extensive Broadband X-Ray Monitoring During the Formation of a Giant Radio Jet Base in Cyg X-3 with AstroSat Open
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 2017 April 1–2. Within a timescale of a few hours, the source shows a transition from the hypersoft state (HPS) to …