Silpa Sasikumar
Visiting Fellow
National Centre for Radio Astrophysics
Tata Institute of Fundamental Research
Savitribai Phule Pune University Campus,
Pune 411 007
Maharashtra, INDIA
Tata Institute of Fundamental Research
Savitribai Phule Pune University Campus,
Pune 411 007
Maharashtra, INDIA
Status: Left
Main Research Areas: Active Galactic Nuclei; Quasars; Outflows
Biography:
Silpa Sasikumar obtained a B.Sc. (Honours) in Physics from Miranda House, University of Delhi, in 2014 and an M.Sc. in Physics from the University of Delhi in 2016. She joined the Ph.D. programme at NCRA-TIFR in August 2017, and is currently working with Preeti Kharb towards her Ph.D.Research description:
My research aims to address the long-standing open question of the physical mechanisms driving active galactic nuclei (AGNs) outflows. The focal sample of my work is quasars, in which the drivers and impact of outflows are highly controversial. We use radio polarization-sensitive observations to understand the dominant radio emission mechanism in radio-quiet quasars. We search for "relic" radio emission from previous episodes of AGN activity which help us constrain the AGN duty cycles. We also aim to understand the impact of AGN outflows on the properties and content of the multi-phase gas inside the interstellar medium of the host galaxies using multi-wavelength observations.Selected publications:
(1) The Quasar Feedback Survey: revealing the interplay of jets, winds, and emission-line gas in type 2 quasars with radio polarization (Silpa S., P. Kharb, C. M. Harrison, A. Girdhar, D. Mukherjee, V. Mainieri, M. E. Jarvis 2022, MNRAS, 513, 4208) (2) AGN jets and winds in polarized light: the case of Mrk 231 (Silpa S., P. Kharb, C. P. O'Dea, S. A. Baum, B. Sebastian, D. Mukherjee, C. M. Harrison 2021, MNRAS, 507, 2550) (3) Outflows in the radio-intermediate quasar III Zw 2: a polarization study with the EVLA and uGMRT (Silpa S., P. Kharb, C. M. Harrison, L. C. Ho, M. E. Jarvis, C. H. Ishwara-Chandra, B. Sebastian 2021, MNRAS, 507, 991) (4) Probing the origin of low-frequency radio emission in PG quasars with the uGMRT - I (Silpa S., P. Kharb, L. C. Ho, C. H. Ishwara-Chandra, M. E. Jarvis, C. M. Harrison 2020, MNRAS, 499, 5826)
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