85 citations · 338 across the 19 of their papers we have counts for
19 papers
Clustering of eclipsing binary light curves through functional principal component analysis
Soumita Modak, Tanuka Chattopadhyay, Asis Kumar Chattopadhyay
In this paper, we revisit the problem of clustering 1318 new variable stars found in the Milky way. Our recent work distinguishes these stars based on their light curves which are…
Investigation of the Effect of Bars on the Properties of Spiral Galaxies: A Multivariate Statistical Study
Prasenjit Banerjee, Tanuka Chattopadhyay, Asis Kumar Chattopadhyay
Subjective classification of spiral galaxies is not sufficient for studying the effect of bars on their physical characteristics. In reality the problem is to comprehend the comple…
Role of galactic bars in the formation of spiral arms: A study through orbital and escape dynamics -- I
Debasish Mondal, Tanuka Chattopadhyay
In the present work we have developed a three-dimensional gravitational model of barred galaxies, in order to study orbital and escape dynamics of the stars inside their central ba…
Exploration about the origin of galactic and extragalactic star clusters through simulated H-R diagrams
Tanuka Chattopadhyay, Sreerup Mondal, Suman Paul +2
The present work explores the origin of the formation of star clusters in our Galaxy and in Small Magellanic Cloud (SMC) through simulated H-R diagrams and compare those with obser…
Unsupervised Classification of Galaxies. I. ICA feature selection
Tanuka Chattopadhyay, Didier Fraix-Burnet, Saptarshi Mondal
Subjective classification of galaxies can mislead us in the quest of the origin regarding formation and evolution of galaxies since this is necessarily limited to a few features. T…
Unsupervised classification of eclipsing binary light curves through k-medoids clustering
Soumita Modak, Tanuka Chattopadhyay, Asis Kumar Chattopadhyay
This paper proposes k-medoids clustering method to reveal the distinct groups of 1,318 variable stars in the Galaxy based on their light curves, where each light curve represents t…
Clustering of Gamma-Ray bursts through kernel principal component analysis
Soumita Modak, Asis Kumar Chattopadhyay, Tanuka Chattopadhyay
We consider the problem related to clustering of gamma-ray bursts (from "BATSE" catalogue) through kernel principal component analysis in which our proposed kernel outperforms resu…
Two phase formation of massive elliptical galaxies : study through cross-correlation including spatial effect
Soumita Modak, Tanuka Chattopadhyay, Asis Kumar Chattopadhyay
Formation mechanism of present day population of elliptical galaxies have been revisited in the context of hierarchical cosmological models accompanied by accretion and minor merge…
Episodic Model For Star Formation History and Chemical Abundances in Giant and Dwarf Galaxies
Suma Debsarma, Tanuka Chattopadhyay, Sukanta Das +1
In search for a synthetic understanding, a scenario for the evolution of the star formation rate and the chemical abundances in galaxies is proposed, combining gas infall from gala…
Cosmic history of integrated galactic stellar initial mass function : a simulation study
Tanuka Chattopadhyay, Tuli De, Bharat Warlu +1
Theoretical and indirect observational evidences suggest that stellar initial mass function (IMF) increases with redshift. On the other hand star formation rates (SFR) may be as hi…
Charged star in (2+1)-dimensional gravity
Ayan Banerjee, Farook Rahaman, Tanuka Chattopadhyay
We obtain a new class of exact solutions for the Einstein-Maxwell system in static spherically symmetric charged star in (2+1)-dimensional gravity. In order to obtain the analytica…
Formation of dwarf ellipticals and dwarf irregular galaxies by interaction of giant galaxies under environmental influence
Tanuka Chattopadhyay, Suma Debsarma, Pradip Karmakar +1
A model is proposed for the formation of gas-rich dwarf irregular galaxies and gas-poor, rotating dwarf elliptical galaxies following the interaction between two giant galaxies as…
Use of spatial cross correlation function to study formation mechanism of massive elliptical galaxies
Tuli De, Tanuka Chattopadhyay, Asis Kumar Chattopadhyay
Spatial clustering nature of galaxies have been studied previously through auto correlation function. The same type of cross correlation function has been used to investigate param…
A six-parameter space to describe galaxy diversification
Didier Fraix-Burnet, Tanuka Chattopadhyay, Asis Kumar Chattopadhyay +2
Galaxy diversification proceeds by transforming events like accretion, interaction or mergers. These explain the formation and evolution of galaxies that can now be described with…
Statistical analysis of dwarf galaxies and their globular clusters in the Local Volume
Tanuka Chattopadhyay, M. E. Sharina, Pradip Karmakar
Morphological classification of dwarf galaxies into early and late type, though can account for some of their origin and characteristics but does not help to study their formation…
Uncovering the formation of ultra-compact dwarf galaxies by multivariate statistical analysis
Tanuka Chattopadhyay, Margarita Sharina, Emmanuel Davoust +2
We present a statistical analysis of the properties of a large sample of dynamically hot old stellar systems, from globular clusters to giant ellipticals, which was performed in or…
Structures in the fundamental plane of early-type galaxies
Didier Fraix-Burnet, Magali Dugué, Tanuka Chattopadhyay +2
The fundamental plane of early-type galaxies is a rather tight three-parameter correlation discovered more than twenty years ago. It has resisted a both global and precise physical…
Study of NGC 5128 Globular Clusters Under Multivariate Statistical Paradigm
Asis Kumar Chattopadhyay, Tanuka Chattopadhyay, Emmanuel Davoust +2
An objective classification of the globular clusters of NGC 5128 has been carried out by using a model-based approach of cluster analysis. The set of observable parameters includes…
Statistical Evidence for Three classes of Gamma-ray Bursts
Tanuka Chattopadhyay, Ranjeev Misra, Asis Kumar Chattopadhyay +1
Two different multivariate clustering techniques, the K-means partitioning method and the Dirichlet process of mixture modeling, have been applied to the BATSE Gamma-ray burst (GRB…