Saili Dutta

Post-Doctoral Fellow
Email: sailidutta [at]
Phone: 020-25719295
Extn: 9295
Office: 218D
National Centre for Radio Astrophysics
Tata Institute of Fundamental Research
Savitribai Phule Pune University Campus,
Pune 411 007
Maharashtra, INDIA

Main Research Areas: 21 cm line as a probe of structure formation; Galaxy formation; Large scale structure of the Universe.


Saili completed her B.Sc. (Hons.) in Physics in 2012, and her M.Sc. in Physics in 2014, from Siksha Bhavana, Visva-Bharati University. She obtained her Ph.D. from the National Institute of Science Education and Research, Bhubaneswar, in 2021. After submitting her Ph.D. thesis she joined NISER, Bhubaneswar as a Visiting Research Fellow. She joined NCRA-TIFR as a Post-doctoral Fellow in February 2022.

Research description:

Hydrogen is the most abundant element in the Universe and can be characterized as being in the ionized, neutral atomic, or molecular states. Though in the post re-ionization era, the bulk of the hydrogen gas in the intergalactic medium is almost completely ionized, much of the hydrogen inside galaxies is in the neutral atomic form ("HI"), providing fuel for future star formation of the galaxy. Conditions in the HI thus provide a useful probe of both structure and galaxy formation. For the last few years, I have looked at the distribution of HI inside galaxies and the dark matter halos, in the local Universe (z <= 0.05). I have investigated how different populations of galaxies contribute to the total HI mass function (HIMF) and the total HI density parameter. This work has been done by estimating the conditional HIMF, conditioned on optical properties. I have used Arecibo Legacy Fast ALFA (ALFALFA) survey data and Sloan Digital Sky Survey (SDSS) data for these studies. Currently, I am working on a halo model to populate HI in dark matter halos, using recent observational results.

Selected publications:

1. The Dark Matter Haloes of HI Selected Galaxies (Saili Dutta, Nishikanta Khandai & Sandeep Rana 2022, MNRAS, 511, 2585

2. The Distribution of Neutral Hydrogen in the Color-Magnitude Plane of Galaxies (Saili Dutta & Nishikanta Khandai 2020 MNRAS, 500, 37)

3. The Population of Galaxies that Contribute to The HI Mass Function (Saili Dutta, Nishikanta Khandai & Biprateep Dey 2020, MNRAS, 494, 2664)