42 citations · 307 across the 28 of their papers we have counts for
28 papers
Negentropy as Diagnostic of Cosmic Density Fields and Dynamical Dark Energy Models
Suman Sarkar
We employ negentropy (), defined as the difference between the information content of a non-Gaussian probability distribution and a Gaussian with identical variance, as an infor…
Galaxy evolution in the cosmic web: the relative impact of nodes and filaments in the EAGLE simulation
Suman Sarkar, Biswajit Pandey, Apashanka Das
Galaxies evolve within the intricate geometry of the cosmic web, yet the distinct roles of its primary components - nodes and filaments remain incompletely understood. Using the EA…
Identifying lopsidedness in spiral galaxies using a Deep Convolutional Neural Network
Biju Saha, Suman Sarkar, Arunima Banerjee
About 30\% of disk galaxies show lopsidedness in their stellar disk. Although such a large-scale asymmetry in the disk can be primarily looked upon as a long-lived mode (), th…
Impact of Large-Scale Structure Formation on the Global Information Budget
Suman Sarkar
This paper offers an original theoretical framework to quantify the information content associated with cosmological structure formation. By taking into account the growth in pertu…
Unveiling galaxy pair alignment in cosmic filaments: A 3D exploration using EAGLE simulation
Suman Sarkar, Biswajit Pandey
We investigate how galaxy pairs are oriented in three dimensions within cosmic filaments using data from the EAGLE simulation. We identify filament spines using DisPerSE and isolat…
Analyzing the cosmic web environment in the vicinity of grand-design and flocculent spirals with local geometric index
Suman Sarkar, Ganesh Narayanan, Arunima Banerjee
We explore the environment of a combined set of grand-design and flocculent spiral galaxies. We introduce a novel estimator called the \textit{local geometric index} to…
Galaxy interactions in filaments and sheets: insights from EAGLE simulations
Apashanka Das, Biswajit Pandey, Suman Sarkar
We study the colour and star formation rates of paired galaxies in filaments and sheets using the EAGLE simulations. We find that the major pairs with pair separation kpc are…
Analyzing the cosmic architecture in the vicinity of Grand-design and Flocculent spiral galaxies with Local Geometric Index
Suman Sarkar, Ganesh Narayanan, Arunima Banerjee
We explore the environment of 351 grand-design and 541 flocculent spiral galaxies recently identified employing convolutional neural networks from the data release of Slo…
Galaxy interactions in filaments and sheets: effects of the large-scale structures versus the local density
Apashanka Das, Biswajit Pandey, Suman Sarkar
The major interactions are known to trigger star formation in galaxies and alter their colour. We study the major interactions in filaments and sheets using the SDSS data to unders…
The maximum extent of the filaments and sheets in the cosmic web: an analysis of the SDSS DR17
Prakash Sarkar, Biswajit Pandey, Suman Sarkar
Filaments and sheets are striking visual patterns in cosmic web. The maximum extent of these large-scale structures are difficult to determine due to their structural variety and c…
Do minor interactions trigger star formation in galaxy pairs?
Apashanka Das, Biswajit Pandey, Suman Sarkar
We analyze the galaxy pairs in a set of volume limited samples from the SDSS to study the effects of minor interactions on the star formation rate (SFR) and colour of galaxies. We…
Identification of Grand-design and Flocculent Spirals from SDSS using Convolutional Neural network
Suman Sarkar, Ganesh Narayanan, Arunima Banerjee +1
Spiral galaxies can be classified into the {\it Grand-designs} and {\it Flocculents} based on the nature of their spiral arms. The {\it Grand-designs} exhibit almost continuous and…
On the origin of red spirals: Does assembly bias play a role?
Suman Sarkar, Biswajit Pandey, Apashanka Das
The formation of the red spirals is a puzzling issue in the standard picture of galaxy formation and evolution. Most studies attribute the colour of the red spirals to different en…
The local environment of flat galaxies
Suman Sarkar, Arunima Banerjee, Dmitry Makarov
The existence of flat or bulgeless galaxies poses a challenge to the hierarchical structure formation scenario advocated by modern cosmology. We determine the geometrical environme…
Galaxy interactions in different environments: An analysis of galaxy pairs from the SDSS
Apashanka Das, Biswajit Pandey, Suman Sarkar +1
We analyze the galaxy pairs in a volume limited sample () from the SDSS to study the effects of galaxy interactions on the star formation rate and colour of galaxies…
Testing homogeneity of the galaxy distribution in the SDSS using Renyi entropy
Biswajit Pandey, Suman Sarkar
We analyze a set of volume limited sample of galaxies from the SDSS to study the issue of cosmic homogeneity. We use the Renyi entropy of different order to probe the inhomogenetie…
Green valley galaxies in the cosmic web: internal versus environmental quenching
Apashanka Das, Biswajit Pandey, Suman Sarkar
We analyze the SDSS data to classify the galaxies based on their colour using a fuzzy set-theoretic method and quantify their environments using the local dimension. We find that t…
Do galactic bars depend on environment?: An information theoretic analysis of Galaxy Zoo 2
Suman Sarkar, Biswajit Pandey, Snehasish Bhattacharjee
We use an information theoretic framework to analyze data from the Galaxy Zoo 2 project and study if there are any statistically significant correlations between the presence of ba…
Can a conditioning on stellar mass explain the mutual information between morphology and environment?
Snehasish Bhattacharjee, Biswajit Pandey, Suman Sarkar
Recent studies with SDSS have shown that a statistically significant non-zero mutual information between morphology and environment persists up to several tens of Mpc, which awaits…
A study on the statistical significance of mutual information between morphology of a galaxy and its large-scale environment
Suman Sarkar, Biswajit Pandey
A non-zero mutual information between morphology of a galaxy and its large-scale environment is known to exist in SDSS upto a few tens of Mpc. It is important to test the statistic…
Exploring galaxy colour in different environments of the cosmic web with SDSS
Biswajit Pandey, Suman Sarkar
We analyze a set of volume limited samples from the SDSS to study the dependence of galaxy colour on different environments of the cosmic web. We measure the local dimension of gal…
Unravelling the Cosmic Web: An analysis of the SDSS DR14 with the Local Dimension
Suman Sarkar, Biswajit Pandey
We analyze a volume limited galaxy sample from the SDSS to study the environments of galaxies on different length scales in the local Universe. We measure the local dimension of th…
Testing isotropy in the Universe using photometric and spectroscopic data from the SDSS
Suman Sarkar, Biswajit Pandey, Rishi Khatri
We analyze two volume limited galaxy samples from the SDSS photometric and spectroscopic data to test the isotropy in the local Universe. We use information entropy to quantify the…
How much a galaxy knows about its large-scale environment?: An information theoretic perspective
Biswajit Pandey, Suman Sarkar
The small-scale environment characterized by the local density is known to play a crucial role in deciding the galaxy properties but the role of large-scale environment on galaxy f…