Machine Learning / Deep Learning

Two publications from my group which explore applications of Machine Learning / Deep Learning, with me as a co-author.

• Application of Convolutional Neural Networks for Stellar Spectral Classification by Sharma, Kaushal; Kembhavi, Ajit; Kembhavi, Aniruddha; Sivarani, T.; Abraham, Sheelu; Vaghmare, Kaustubh
• "Detection of bars in galaxies using a deep convolutional neural network " by Abraham, Sheelu; Aniyan, A. K.; Kembhavi, Ajit K.; Philip, N. S.; Vaghmare, Kaustubh
• " Information Retrieval and Recommendation System for Astronomical Observatories by Nikhil Mukund, Saurabh Thakur, Sheelu Abraham, A. K. Aniyan, Sanjit Mitra, Ninan Sajeeth Philip, Kaustubh Vaghmare, D. P. Acharjya

Structure, Properties and Formation Histories of S0s

My main area of research is the morphology of nearby galaxies. In particular, I am working on S0 or lenticular galaxies. These galaxies occupy a a very conspicious position on the Hubble tuning fork diagram viz. at the junction of the “tuning fork”. This position can be interpreted as implying S0s to be an intermediate transition class. But recent studies have shown that there are sub-populations within S0 galaxies with vastly different properties and formation histories. The investigation of the properties of S0s has also been the central work of my PhD thesis. A soft copy of my thesis can be found at this link.

Papers written by me so far on S0 galaxies are as follows -

• A SALT spectral study of S0s hosting pseudobulges by Vaghmare, Kaustubh; Barway, Sudhanshu; Väisänen, Petri; Ramphul, Rajin; Wadadekar, Yogesh; Kembhavi, Ajit K.
• "Which bulges are favoured by barred S0 galaxies? by Sudhanshu Barway, Kanak Saha, Kaustubh Vaghmare, and Ajit Kembhavi
• “Spiral Galaxies as Progenitors of Pseudobulge Hosting S0s “ by Kaustubh Vaghmare, Sudhanshu Barway, Smita Mathur, and Ajit Kembhavi (2015 MNRAS 450 873V )
• “A Spitzer Study of Pseudobulges in S0 Galaxies - Secular Evolution of Disks” by Kaustubh Vaghmare, Sudhanshu Barway, and Ajit Kembhavi (2013 ApJ 767L 33V)
• “Luminosity dependent star-formation history of S0 galaxies: evidence from GALEX-SDSS-2MASS-WISE colours” by Sudhanshu Barway, Yogesh Wadadekar, Kaustubh Vaghmare, and Ajit Kembhavi (2013 MNRAS 432 430B)

Conference proceeding(s) on this topic are:

• “Clues from star-formation histories - does the formation scenario of S0 galaxies depend on their luminosities?” by Sudhanshu Barway, Yogesh Wadadekar, Kaustubh Vaghmare and Ajit Kembhavi (2013, IAU Symposium, 292, 153)

The above papers build up on work done by other authors which are listed below (latest to oldest).

• “Bar fraction in lenticular galaxies: dependence on luminosity and environment “ by Sudhanshu Barway, Yogesh Wadadekar and Ajit Kembhavi (2011, MNRAS, 410, L18)
• “Near-infrared bulge-disc correlations of lenticular galaxies” by Sudhanshu Barway, Yogesh Wadadekar, Ajit Kembhavi and Y D Mayya (2009, MNRAS, 394, 1991)
• “Lenticular Galaxy Formation: Possible Luminosity Dependence” by Sudhanshu Barway, Yogesh Wadadekar, C D Ravikumar, Ajit Kembhavi and Y D Mayya (2007, ApJL, 661, L37)

Other Publications

These are publications in my areas of research other than S0 galaxies.

• “AstroStat-A VO tool for statistical analysis” by Ajit Kembhavi, Kaustubh Vaghmare, et al. (2015 A&C 11 126K)
• “Reflection-dominated Nuclear X-Ray Emission in the Early-type Galaxy ESO 565-G019” by Gandhi, P, Kaustubh Vaghmare, et al. (2013 ApJ 773 51G)