Ruta Kale

Reader F
Email: ruta [at]
Phone: +91 - 20 - 25719234
Extn: 9234
Office: F226
National Centre for Radio Astrophysics
Tata Institute of Fundamental Research
Savitribai Phule Pune University Campus,
Pune 411 007
Maharashtra, INDIA

Main Research Areas: Galaxy clusters: Cosmic rays and magnetic fields, Brightest Cluster Galaxies; Radio galaxies and their evolution.


Ruta obtained her B.Sc. in Physics from Mumbai University in 2003, and her M.Sc. in Physics, from the Indian Institute of Technology, Madras, in 2005. She then obtained her Ph.D. from the Jawaharlal Nehru University, New Delhi, in 2011, based on research work carried out at the Raman Research Institute, Bangalore. After a brief post-doctoral stint at the Inter-University Centre for Astronomy and Astrophysics, Pune, she spent 2.5 years as a Post-Doctoral Research Associate, jointly at the University of Bologna and the Institute of Radio Astronomy, Bologna, Italy. She joined NCRA as a Post-Doctoral Visiting Scientist in June 2014, and then took up a DST Inspire Faculty Fellowship at NCRA. She joined NCRA as a faculty member in October 2017.

Research description:

Galaxy clusters are the most massive gravitationally-bound objects in the Universe. They contain dark matter, hundreds to thousands of galaxies, and diffuse gas (the intra-cluster medium, ICM). The cosmic rays and magnetic fields in the intra-cluster medium (ICM) are manifested in the form of megaparsec-scale diffuse radio emission termed as radio halos and relics. Radio halos and relics are rare and are found mainly in merging clusters. The origins of these sources are still unknown. Ruta uses radio telescopes such as the GMRT, VLA, WSRT and ATCA to study the properties of these sources. Ruta is working on the Extended GMRT Radio Halo Survey in collaboration with a group based in the Institute of Radio Astronomy, Bologna, Italy. This is the largest deep survey of galaxy clusters and is providing vital clues on the occurrence of radio halos. Recently, she has been investigating whether the radio properties of the Brightest Cluster Galaxies are influenced by dynamical activity in galaxy clusters. Her work also includes searches for diffuse radio emission in clusters discovered by the Planck satellite, spectral and polarization studies of radio relics, and modelling the spectra of relic radio galaxies. Ruta is also currently involved in the Galaxy Cluster Key Science projects with the Low Frequency Array (LOFAR) and the Murchison Widefield Array (MWA).

Selected publications:

1. The Extended GMRT Radio Halo Survey I: New upper limits on radio halos and mini-halos (R. Kale, T. Venturi, S. Giacintucci et al. 2013, A&A, 557, 99)

2. Discovery of a Giant Radio Halo in a New Planck Galaxy Cluster PLCKG171.9-40.7 (S. Giacintucci, R. Kale et al. 2013, ApJ, 766, 18)

3. Spectral and polarization study of the double relics in Abell 3376 using the Giant Metrewave Radio Telescope and the Very Large Array (R. Kale et al. 2012, MNRAS, 426, 1204)

4. Multi-frequency Studies of Radio Relics in the Galaxy Clusters A4038, A1664, and A786. (R. Kale & K. S. Dwarakanath 2012, ApJ, 744, 46)