212 citations · 380 across the 20 of their papers we have counts for
20 papers
Ultraviolet variability in Radio-Loud Active Galactic Nuclei observed by UVIT onboard AstroSat
M. Reshma, C. S. Stalin, Amit Kumar Mandal +3
Radio-loud active galactic nuclei (AGN) are among the most luminous objects in the Universe, emitting radiation from low-energy radio waves to high energy -rays. They are well k…
Detection of time delay between UV and X-ray variability in Mrk 1044 using AstroSat observations
M. Reshma, C. S. Stalin, Amit Kumar Mandal +3
Active galactic nuclei are known to exhibit flux variations across the entire electromagnetic spectrum. Among these, correlations between UV/optical and X-ray flux variations serve…
Ultraviolet flux and spectral variability study of blazars observed with UVIT/AstroSat
M. Reshma, Aditi Agarwal, C. S. Stalin +5
Blazars, the peculiar class of active galactic nuclei (AGN), are known to show flux variations across the accessible electromagnetic spectrum. Though they have been studied extensi…
NuSTAR and AstroSat observations of GX 91: Spectral and temporal studies
Neal Titus Thomas, S. B. Gudennavar, S. G. Bubbly
We have studied the spectro-temporal properties of the neutron star low mass X-ray binary GX 91 using data from \textit{NuSTAR/FPM} and \textit{AstroSat/SXT} and \textit{LAXPC}.…
Spectro-temporal and Type I X-ray burst analysis of GX 31 using AstroSat observations
Neal Titus Thomas, S. B. Gudennavar, S. G. Bubbly
GX 31, an atoll type neutron star low-mass X-ray binary, was observed four times by Soft X-ray Telescope and The Large Area X-ray Proportional Counters on-board \textit{AstroSat…
Spectral characteristics of the black hole binary 4U 1957+115: A multi-mission perspective
Sneha Prakash Mudambi, S. B. Gudennavar, R. Misra +1
We report spectral analysis of the persistent black hole X-ray binary, 4U 1957+115, using AstroSat, Swift and NuSTAR observations carried out between 2016-2019. Modelling with a di…
Spectral properties of soft X-ray transient MAXI J0637430 using AstroSat
Neal Titus Thomas, Shivappa B. Gudennavar, Ranjeev Misra +1
Soft X-ray transients are systems that are detected when they go into an outburst, wherein their X-ray luminosity increases several orders of magnitude. These outbursts are markers…
Mid-infrared Variability of gamma-ray emitting blazars
Ayesha Anjum, C. S. Stalin, Suvendu Rakshit +2
Using data from the Wide-field Infrared Survey Explorer we studied the mid infrared 3.4 m (W1-band) and 4.6 m (W2-band) flux variability of -ray emitting blazars. Our samp…
Unveiling the temporal properties of MAXI J1820+070 through AstroSat observations
Sneha Prakash Mudambi, Bari Maqbool, Ranjeev Misra +4
We present here the results of the first broadband simultaneous spectral and temporal studies of the newly detected black hole binary MAXI J1820+070 as seen by SXT and LAXPC on-boa…
Are Narrow Line Seyfert 1 Galaxies powered by low mass black holes?
Gayathri Viswanath, C S Stalin, Suvendu Rakshit +4
Narrow line Seyfert 1 galaxies (NLS1s) are believed to be powered by accretion of matter onto low mass black holes (BHs) in spiral host galaxies with BH masses M_BH of 10^6 - 10^8…
A stochastic propagation model to the energy dependent rapid temporal behaviour of Cygnus X-1 as observed by AstroSat in the hard state
Bari Maqbool, M. Sneha Prakash, R. Misra +8
We report the results from analysis of six observations of Cygnus X-1 by Large Area X-ray Proportional Counters (LAXPC) and Soft X-ray Telescope (SXT) on-board AstroSat, when the s…
Effects of dark matter in star formation
Arun Kenath, S B Gudennavar, A Prasad +1
The standard model for the formation of structure assumes that there existed small fluctuations in the early universe that grew due to gravitational instability. The origins of the…
A study of the star forming regions in the spiral galaxy NGC 2336 using the Ultraviolet Imaging Telescope (UVIT)
P. T. Rahna, M. Das, Jayant Murthy +2
We present a far-UV (FUV) and near-UV (NUV) imaging study of recent star formation in the nearby spiral galaxy NGC 2336 using the Ultraviolet Imaging Telescope (UVIT). NGC 2336 is…
Alternate Models to Dark Energy
Kenath Arun, S B Gudennavar, A Prasad +1
One of the unresolved questions currently in cosmology is that of the non-linear accelerated expansion of the universe. This has been attributed to the so called Dark Energy (DE).…
Investigating the In-Flight Performance of the UVIT Payload on ASTROSAT
P. T. Rahna, Jayant Murthy, M. Safonova +3
We have studied the performance of the Ultraviolet Imaging Telescope payload on AstroSat and derived a calibration of the FUV and NUV instruments on board. We find that the sensiti…
Dark matter, dark energy, and alternate models: A review
Kenath Arun, S. B. Gudennavar, C Sivaram
The nature of dark matter (DM) and dark energy (DE) which is supposed to constitute about 95% of the energy density of the universe is still a mystery. There is no shortage of idea…
Similarity indexing of exoplanets in search for potential habitability: application to Mars-like worlds
Madhu Kashyap Jagadeesh, S. B. Gudennavar, Urmi Doshi +1
Study of exoplanets is one of the main goals of present research in planetary sciences and astrobiology. Analysis of huge planetary data from space missions such as CoRoT and Keple…
JUDE: An Ultraviolet Imaging Telescope Pipeline
Jayant Murthy, P. T. Rahna, Firoza Sutaria +3
The Ultraviolet Imaging Telescope (UVIT) was launched as part of the multi-wavelength Indian ASTROSAT mission on 28 September, 2015 into a low Earth orbit. A 6-month performance ve…
Photometric Identification of Objects from Galaxy Evolution Explorer Survey and Sloan Digital Sky Survey
K. Preethi, S. B. Gudennavar, S. G. Bubbly +2
We have used GALEX and SDSS observations to extract 7 band photometric magnitudes for over 80,000 objects in the vicinity of the North Galactic Pole. Although these had been identi…
Alpha decay favoured isotopes of some superheavy nuclei: Spontaneous fission versus alpha decay
O. V. Kiren, S. B. Gudennavar, S. G. Bubbly
Spontaneous fission and alpha decay are the main decay modes for superheavy nuclei. The superheavy nuclei which have small alpha decay half-life compared to spontaneous fission hal…