6 citations · 9 across the 7 of their papers we have counts for
8 papers
Explainable machine learning classification of \textit{Chandra} X-ray sources: SHAP analysis of multi-wavelength features
Shivam Kumaran, Samir Mandal, Sudip Bhattacharyya
Extensive astronomical surveys, like those conducted with the {\em Chandra} X-ray Observatory, detect hundreds of thousands of unidentified cosmic sources. Machine learning (ML) me…
Particle Acceleration and Depolarization in the Protostellar jet knots HH 80 and HH 81
A. G. Cheriyan, S. Vig, Nirupam Roy +4
Linearly polarized emission is a powerful tracer of magnetic field geometry and particle acceleration in protostellar jets. We present a polarimetric study of the HH objects HH 80…
First detection of Circular Polarization in radio continuum towards a Massive Protostar
A. G. Cheriyan, S. Vig, Nirupam Roy +4
Polarization measurements provide strong constraints on magnetic fields in star-forming systems. While magnetic field estimates of a few kiloGauss (kG) have been obtained near the…
The Non-Uniform Expansion of the Crab Nebula
T. Martin, D. Milisavljevic, T. Temim +4
We present extensive proper motion measurements of the Crab Nebula made from Canada-France-Hawaii Telescope MegaPrime/MegaCam images taken in 2007, 2016, and 2019. A total of 19974…
Probing properties of nearly two-hundred new active galactic nuclei
Samrat Ghosh, Samir Mandal, Sudip Bhattacharyya +1
We present a comprehensive analysis of the X-ray spectral properties of 198 newly identified active galactic nuclei (AGNs), leveraging archival data from the {\it Chandra} X-ray Ob…
AT2020ohl: its nature and probable implications
Rupak Roy, Samir Mandal, D. K. Sahu +3
ASASSN-20hx, a.k.a AT2020ohl, is an ambiguous nuclear transient (ANT), which was discovered in the nearby galaxy NGC6297 by the All-Sky Automated Survey for Supernovae (ASAS-SN). W…
Radio spectra of protostellar jets: Thermal and non-thermal emission
Sreelekshmi Mohan, Sarita Vig, Samir Mandal
Protostellar jets and outflows are pointers of star-formation and serve as important sources of momentum and energy transfer to the interstellar medium. Radio emission from ionized…
Spectral Properties of M87 Using Two-Component Flow
Samir Mandal
We fit the observational data for M87 using two-component advective disk model. We show that the flat spectrum from the nucleus of M87 is due to synchrotron radiation produced by n…