S. Majumder

activity

20102025

most citedWide-band view of High Frequency QPOs of GRS 1915+105 in 'softer' variability classes observed with AstroSat

34 citations · 60 across the 11 of their papers we have counts for

collaborators

11 papers

astro-ph.HE2025

Possible detection of HFQPOs associated with 'unknown' variability class of GRS 1915+105

Seshadri Majumder, Santabrata Das, Anuj Nandi

We present a comprehensive spectro-temporal analysis of GRS $1915 + 105$ observed with AstroSat during June, $2017$ . A detailed study of the temporal properties reveals the appearanc…

astro-ph.HE2025

Probing the accretion geometry of black hole X-ray binaries: A multi-mission spectro-polarimetric and timing study

Seshadri Majumder, Ankur Kushwaha, Swapnil Singh +3

We present a comprehensive spectro-polarimetric and timing analysis of twelve black hole X-ray binaries, namely Cyg X-1, 4U 1630-47, Cyg X-3, LMC X-1, 4U 1957+115, LMC X-3, Swift J…

astro-ph.HE2025

Evidence of oscillating `compact' Comptonized corona in GRS 1915+105: Insights into HFQPOs with AstroSat

Sreehari Harikesh, Seshadri Majumder, Santabrata Das +1

We present, for the first time, an in-depth dynamical analysis of the spectro-temporal properties of the soft variability classes ( $δ$ , $κ$ , $ω$ , and $γ$ ) of GRS 1915+105 during th…

astro-ph.HE2025★ 1 cited

Long-term evolution of BH-ULX candidates: An `unusual' $L_{disc}$ - $T_{col}$ correlation associated with spectral states

Seshadri Majumder, Santabrata Das, Anuj Nandi

We present the long-term spectral evolution of eight black hole ultra-luminous X-ray sources (BH-ULXs), namely NGC1313 X-1, NGC5408 X-1, NGC6946 X-1, IC342 X-1, NGC55 ULX1, NGC4395…

astro-ph.HE2024

Discovery of evolving low-frequency QPOs in hard X-rays ( $\sim 100$ keV) observed in black hole Swift J1727.8-1613 with $A s t r o S a t$

Anuj Nandi, Santabrata Das, Seshadri Majumder +3

We report the first detection of evolving Low-Frequency Quasi-periodic Oscillation (LFQPO) frequencies in hard X-rays upto $100$ keV with $A s t r o S a t / L A X P C$ during `unusual' outburst…

astro-ph.HE2024

First detection of X-ray polarization in Galactic ULX pulsar Swift J0243.6 $+$ 6124 with {\it IXPE}

Seshadri Majumder, Rwitika Chatterjee, Kiran M. Jayasury +2

We report the results of first ever spectro-polarimetric analyses of the Galactic ultra-luminous X-ray pulsar Swift J0243.6 $+ 6124$ during the 2023 outburst using quasi-simultaneous…

astro-ph.HE2023★ 1 cited

First detection of X-ray polarization in thermal state of LMC X-3: Spectro-polarimetric study with IXPE

Seshadri Majumder, Ankur Kushwaha, Santabrata Das +1

We report a comprehensive spectro-polarimetric study of the black hole binary LMC X $- 3$ using simultaneous {\it IXPE}, {\it NICER} and {\it NuSTAR} observations in 0.5 $-$ 20 keV ene…

astro-ph.HE2023

Unveiling the accretion scenario of BH-ULXs using XMM-Newton observations

Seshadri Majumder, Santabrata Das, Vivek. K. Agrawal +1

We present a comprehensive spectro-temporal analysis of five ultraluminous X-ray sources (ULXs) with central object likely being a black hole, using archival {\it XMM-Newton} obser…

astro-ph.HE2022★ 34 cited

Wide-band view of High Frequency QPOs of GRS 1915+105 in 'softer' variability classes observed with AstroSat

Seshadri Majumder, H. Sreehari, Nafisa Aftab +3

We present a comprehensive temporal and spectral analysis of the 'softer' variability classes ( $i . e .$ , $θ$ , $β$ , $δ$ , $ρ$ , $κ$ , $ω$ and $γ$ ) of the source GRS 1915+105 observed by…

astro-ph.HE2021★ 17 cited

Relativistic viscous accretion flow model for ULX sources: A case study for IC 342 X-1

Santabrata Das, Anuj Nandi, Vivek K. Agrawal +2

In this letter, we develop a model formalism to study the structure of a relativistic, viscous, optically thin, advective accretion flow around a rotating black hole in presence of…

astro-ph.EP2010★ 7 cited

Aggregate dust model to study the polarization properties of comet C/1996 B2 Hyakutake

H. S. Das, A. Suklabaidya, S. Datta Majumder +1

In our present study, the observed linear polarization data of comet Hyakutake are studied at wavelengths $λ = 0.365 μ m$ , $λ = 0.485 μ m$ and 0.684 $μ m$ through simulations using Ballistic…

Possible detection of HFQPOs associated with 'unknown' variability class of GRS 1915+105

Probing the accretion geometry of black hole X-ray binaries: A multi-mission spectro-polarimetric and timing study

Evidence of oscillating `compact' Comptonized corona in GRS 1915+105: Insights into HFQPOs with AstroSat

Long-term evolution of BH-ULX candidates: An `unusual' Ldisc​-Tcol​ correlation associated with spectral states

Discovery of evolving low-frequency QPOs in hard X-rays (∼100 keV) observed in black hole Swift J1727.8-1613 with AstroSat

First detection of X-ray polarization in Galactic ULX pulsar Swift J0243.6+6124 with {\it IXPE}

First detection of X-ray polarization in thermal state of LMC X-3: Spectro-polarimetric study with IXPE

Unveiling the accretion scenario of BH-ULXs using XMM-Newton observations

Wide-band view of High Frequency QPOs of GRS 1915+105 in 'softer' variability classes observed with AstroSat

Relativistic viscous accretion flow model for ULX sources: A case study for IC 342 X-1

Aggregate dust model to study the polarization properties of comet C/1996 B2 Hyakutake

Long-term evolution of BH-ULX candidates: An `unusual' $L_{disc}$ - $T_{col}$ correlation associated with spectral states

Discovery of evolving low-frequency QPOs in hard X-rays ( $\sim 100$ keV) observed in black hole Swift J1727.8-1613 with $A s t r o S a t$

First detection of X-ray polarization in Galactic ULX pulsar Swift J0243.6 $+$ 6124 with {\it IXPE}