64 citations · 391 across the 32 of their papers we have counts for
33 papers
The emergence of X-ray emission lines during relativistic radio-jet formation in the changing-look active galactic nucleus 1ES 1927+654
Dev R. Sadaula, Sibasish Laha, Eileen T. Meyer +27
We present results from a comprehensive multi-wavelength monitoring campaign of the changing-look active galactic nucleus 1ES 1927+654 during the onset and evolution of a relativis…
Multi-wavelength observations of a jet launch in real time from the post-changing-look Active Galaxy 1ES 1927+654
Sibasish Laha, Eileen T. Meyer, Dev R. Sadaula +34
We present results from a high cadence multi-wavelength observational campaign of the enigmatic changing look AGN 1ES 1927+654 from May 2022- April 2024, coincident with an unprece…
Late-time radio brightening and emergence of a radio jet in the changing-look AGN 1ES 1927+654
Eileen T. Meyer, Sibasish Laha, Onic I. Shuvo +32
We present multi-frequency (5-345 GHz) and multi-resolution radio observations of 1ES 1927+654, widely considered one of the most unusual and extreme changing-look active galactic…
A re-emerging bright soft-X-ray state of the changing-look Active Galactic Nucleus 1ES~1927+654: a multi-wavelength view
Ritesh Ghosh, Sibasish Laha, Eileen Meyer +24
1ES1927+654 is a nearby active galactic nucleus that has shown an enigmatic outburst in optical/UV followed by X-rays, exhibiting strange variability patterns at timescales of mont…
Impact of chiral asymmetry and magnetic field on passage of an energetic test parton in a QCD medium
Ritesh Ghosh, Mohammad Yousuf Jamal, Manu Kurian
We study the dependence of collisional energy loss of a test parton moving with a high velocity on the chiral imbalance and magnetic field in the QCD medium. A semi-classical appro…
The complex heavy-quark potential with the Gribov-Zwanziger action
Manas Debnath, Ritesh Ghosh, Najmul Haque
Gribov-Zwanziger prescription in Yang-Mills theory improves the infrared dynamics. In this work, we study the static potential of a heavy quark-antiquark pair with the HTL resummed…
Magnetic field-dependent electric charge transport in hadronic medium at finite temperature
Ritesh Ghosh, Manu Kurian
Electric charge transport of hadronic matter at finite temperature and magnetic field is studied within the linear sigma model. Anisotropic transport coefficients associated with t…
The origin of the vanishing soft X-ray excess in the changing-look Active Galactic Nucleus Mrk 590
Ritesh Ghosh, Sibasish Laha, Kunal Deshmukh +3
We have studied the nature and origin of the soft X-ray excess detected in the interesting changing-look AGN (CLAGN) Mrk~590 using two decades of multi-wavelength observations from…
Collective modes of gluons in an anisotropic thermo-magnetic medium
Bithika Karmakar, Ritesh Ghosh, Arghya Mukherjee
We study the collective modes of gluons in an anisotropic thermal medium in the presence of a constant background magnetic field using the hard-thermal loop (HTL) perturbation theo…
Heavy quark potential and LQCD based quark condensate at finite magnetic field
Indrani Nilima, Aritra Bandyopadhyay, Ritesh Ghosh +1
In the present work, we have studied heavy quarkonia potential in hot and magnetized quark gluon plasma. Inverse magnetic catalysis (IMC) effect is incorporated within the system t…
Anisotropic tomography of heavy quark dissociation by using general propagator structure at finite magnetic field
Ritesh Ghosh, Aritra Bandyopadhyay, Indrani Nilima +1
In this work we have explored the imaginary part of the Heavy Quark (HQ) potential and subsequently the dissociation of heavy quarkonia at finite temperature and magnetic field. Wi…
Shear Viscosity of hadronic matter at finite temperature and magnetic field
Ritesh Ghosh, Najmul Haque
We calculate the transport coefficient of hadronic matter in the presence of temperature and magnetic field using the linear sigma model. In the relaxation time approximation, we e…
Limits on the hard X-ray emission from the periodic fast radio burst FRB 180916.J0158+65
Sibasish Laha, Zorawar Wadiasingh, Tyler Parsotan +11
FRB 180916.J0158+65 is one of the nearest, periodically repeating, and actively bursting fast radio burst (FRB) which has been localized to the outskirts of a spiral galaxy. In thi…
Simultaneous view of the FRB~180301 with FAST and NICER during a bursting phase
Sibasish Laha, George Younes, Zorawar Wadiasingh +16
FRB180301 is one of the most actively repeating fast radio bursts (FRBs) which has shown polarization angle changes in its radio burst emission, an indication for their likely orig…
A radio, optical, UV and X-ray view of the enigmatic changing look Active Galactic Nucleus 1ES~1927+654 from its pre- to post-flare states
Sibasish Laha, Eileen Meyer, Agniva Roychowdhury +17
The nearby type-II AGN 1ES1927+654 went through a violent changing-look (CL) event beginning December 2017 during which the optical and UV fluxes increased by four magnitudes over…
A study of shear viscosity coefficient of quark matter in Polyakov quark meson model for three flavors
Ritesh Ghosh
We have computed shear viscosity coefficient for hot and dense QCD matter within Polyakov loop extended quark meson(PQM) model for three flavors. Viscosity coefficient is estimated…
A weakening Compton hump and soft X-ray excess detected in the Seyfert-1 galaxy MCG-02-58-22
Sibasish Laha, Ritesh Ghosh
We have carried out an extensive X-ray spectral study of the bare Seyfert-1 galaxy MCG--02--58--22 to ascertain the nature of the X-ray reprocessing media, using observations from…
Anisotropic pressure and quark number susceptibility of strongly magnetized QCD medium
Bithika Karmakar, Ritesh Ghosh, Aritra Bandyopadhyay +2
In this work, we compute the hard thermal loop pressure of quark-gluon plasma within strong magnetic field approximation at one-loop order. Magnetic field breaks the rotational sym…
Chiral susceptibility in dense thermo-magnetic QCD medium within HTL approximation
Ritesh Ghosh, Bithika Karmakar, Munshi Golam Mustafa
We have computed the chiral susceptibility in quark-gluon plasma in presence of finite chemical potential and weak magnetic field within hard thermal loop approximation. First we c…
Short-Timescale Variability of the Blazar Mrk 421 from AstroSat and Simultaneous Multi-Wavelength Observations
Ritaban Chatterjee, Susmita Das, Archishman Khasnovis +13
We study the multi-wavelength variability of the blazar Mrk 421 at minutes to days timescales using simultaneous data at -rays from Fermi, 0.7-20 keV energies from AstroSat, and…
An X-ray spectral study of the origin of reflection features in bare Seyfert 1 galaxy ESO 511--G030
Ritesh Ghosh, Sibasish Laha
The reprocessed X-ray emission from Active Galactic Nuclei (AGN) is an important diagnostic tool to study the dynamics and geometry of the matter surrounding the supermassive black…
Covariant formulation of gluon self-energy in presence of ellipsoidal anisotropy
Ritesh Ghosh, Bithika Karmakar, Arghya Mukherjee
In this work, a covariant formulation of the gluon self-energy in presence of ellipsoidal anisotropy is considered. It is shown that the general structure of the gluon self-energy…
A broadband X-ray spectral study of the Seyfert 1 galaxy ESO 141--G055 with XMM-Newton and NuSTAR
Ritesh Ghosh, Sibasish Laha
We have extensively studied the broadband X-ray spectra of the source ESO~141--G055 using all available \xmm{} and \nustar{} observations. We detect a prominent soft excess below 2…
Dynamics of QCD Matter -- current status
Amaresh Jaiswal, Najmul Haque, Aman Abhishek +58
In this article, there are 18 sections discussing various current topics in the field of relativistic heavy-ion collisions and related phenomena, which will serve as a snapshot of…