85 citations · 332 across the 14 of their papers we have counts for
15 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…
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…
Multivariate Approaches to Classification in Extragalactic Astronomy
Didier Fraix-Burnet, Marc Thuillard, Asis Kumar Chattopadhyay
Clustering objects into synthetic groups is a natural activity of any science. Astrophysics is not an exception and is now facing a deluge of data. For galaxies, the one-century ol…
AstroStat - A VO Tool for Statistical Analysis
Ajit K. Kembhavi, Ashish A. Mahabal, Tejas Kale +8
AstroStat is an easy-to-use tool for performing statistical analysis on data. It has been designed to be compatible with Virtual Observatory (VO) standards thus enabling it to beco…
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…
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…
Clustering large number of extragalactic spectra of galaxies and quasars through canopies
Tuli De, Didier Fraix-Burnet, Asis Kumar Chattopadhyay
Cluster analysis is the distribution of objects into different groups or more precisely the partitioning of a data set into subsets (clusters) so that the data in subsets share som…
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…
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…