A5075382519- Astrophysics and Cosmic Phenomena
- Radio Astronomy Observations and Technology
- Solar and Space Plasma Dynamics
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Gamma-ray bursts and supernovae
- Superconducting Materials and Applications
Swami Ramanand Teerth Marathwada University
2022-2024
Aryabhatta Research Institute of Observational Sciences
2020-2024
We present the results of blazar 3C 273 obtained from simultaneous observations using XMM-Newton and NuSTAR satellites during period 2015-2019 in five epochs. When spectra are modeled with a power-law, significant residuals arise below 2 keV energy range 30-78 data. Residuals lower band represent soft X-ray excess while at higher energies it likely represents Compton reflection hump which might be weak component arising dense cold material. The presence faint iron line is observations....
Abstract We present the results of blazar 3C 273 from simultaneous observations obtained using XMM-Newton and NuSTAR satellites during period 2015–2019 in five epochs. When spectra are modeled with a power law, significant residuals arise below ∼2 keV energy range 30–78 data. Residuals lower band represent soft X-ray excess, while at higher energies it likely represents Compton reflection hump, which might be weak component arising dense cold material. A faint iron line is observations....
ABSTRACT In 2022 the BL Lac object S4 0954+65 underwent a major variability phase, reaching its historical maximum brightness in optical and γ-ray bands. We present photometric polarimetric data acquired by Whole Earth Blazar Telescope (WEBT) Collaboration from April 6 to July 6. Many episodes of unprecedented fast were detected, implying an upper limit size emitting region as low $10^{-4}$ parsec. The WEBT show rapid both degree angle polarization. analyse different models explain...
High synchrotron energy peaked blazar 1ES 1959+650 is studied with Swift and XMM-Newton satellite in total 127 observations during the period June 2018-December 2020. We extensively its flux spectral variability on intra-day long-term timescales. Discrete correlation function analysis between soft hard X-ray bands indicates as well lags. The results are used to constrain magnetic field of emitting region which found be 0.64 (0.05) Gauss. On timescales, distribution fluxes shows lognormality...
We present the results of timing and spectral analysis blazar H 2356-309 using XMM-Newton observations. This is observed during 13 June 2005–24 December 2013 in total nine Five observations show moderate flux variability with amplitude 1.7–2.2%. search for intra-day timescales these five light curves, but did not find any them. The fractional generally lower soft bands than hard bands, which attributed to energy dependent synchrotron emission. Using hardness ratio analysis, we X-ray along...
We present near-simultaneous X-ray and optical polarization measurements in the high synchrotron peaked (HSP) blazar Mrk 421. The polarimetric observations were carried out using {\it Imaging Polarimetry Explorer} ({\it IXPE}) on 06 December 2023. During IXPE} observations, we also 104cm Sampurnanand telescope at Nainital multi-band imaging 2m Himalayan Chandra Telescope Hanle. From model-independent analysis of data, detected with degree ($\Pi_X$) 8.5$\pm$0.5\% an electric vector position...
Abstract We present near-simultaneous X-ray and optical polarization measurements in the high synchrotron peaked (HSP) blazar Mrk 421. The polarimetric observations were carried out using Imaging Polarimetry Explorer (IXPE) on 2023 December 6. During IXPE observations, we also 104 cm Sampurnanand telescope at Nainital multiband imaging 2 m Himalayan Chandra Telescope Hanle. From model-independent analysis of data, detected with degree (Π X ) 8.5% ± 0.5% an electric vector position angle (Ψ...
High synchrotron energy peaked blazar 1ES 1959+650 is studied with Swift and XMM-Newton satellite in total 127 observations during the period June 2018-December 2020. We extensively its flux spectral variability on intra-day long-term timescales. Discrete correlation function analysis between soft hard X-ray bands indicates as well lags. The results are used to constrain magnetic field of emitting region which found be 0.64 (0.05) Gauss. On timescales, distribution fluxes shows lognormality...
We present the results of timing and spectral analysis blazar H 2356-309 using XMM-Newton observations. This is observed during 13 June 2005-24 December 2013 in total nine Five observations show moderate flux variability with amplitude 1.7-2.2 percent. search for intra-day timescales these five light curves, but did not find any them. The fractional generally lower soft bands than hard bands, which attributed to energy dependent synchrotron emission. Using hardness ratio analysis, we X-ray...
We present a study of the flux distribution sample 15 Intermediate and Low-energy peaked blazars using XMM-Newton observations in total 57 epochs on short-term timescales. characterise X-ray variability all light curves excess fractional amplitude found that only 24 7 sources are significantly variable. In order to origin these blazars, we fit distributions Gaussian lognormal distributions, as any non-Gaussian perturbation could indicate imprints fluctuations accretion disc, which be Doppler...