Biny Sebastian
Research Scholar
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; Radio Galaxies.
Biography:
Biny completed her B. Tech. in Engineering Physics from the National Institute of Technology, Calicut, in May 2014, and then joined NCRA-TIFR for her doctoral studies. She is currently carrying out her doctoral research with Preeti Kharb.Research description:
My research primarily focuses on understanding jets hosted by various types of active galactic nuclei, from an observational perspective. The launch of jets, their collimation, and their acceleration/ deceleration in astrophysical sources with masses spanning several orders of magnitude are not yet well understood. Jets in some active galaxies can extend up to sizes of several Mpc in some radio galaxies while the majority do not. The aim of my thesis is primarily to understand the origin of radio outflows in Seyfert and LINER galaxies. In particular, it is unclear if these are purely AGN-driven (either via a jet or an accretion-disk wind) or starburst superwind-driven. Also, due to the presence of copious amounts of gas and ongoing star-formation in their spiral host galaxies, the delineation of AGN emission from stellar emission becomes difficult. Therefore, before addressing the questions related to jet physics in Seyferts, we need to devise ways to disentangle emission from AGN and galactic stars. We are trying to understand if polarization can be used as an effective tool in distinguishing between the starburst-driven and AGN-driven outflows. Besides the above, I am also interested in understanding the evolution of large-scale jets in radio galaxies such as giant radio galaxies, bent-tailed, and X-shaped radio galaxies.Selected publications:
(1) The Discovery of Secondary Lobes in the Seyfert Galaxy NGC 2639 (Sebastian, B., Kharb, P., O’ Dea, C.P., Gallimore, J. F., and Baum, S. A., 2019, MNRAS Letters, 490, L26)
(2) The filamentary radio lobes of the Seyfert-Starburst composite galaxy NGC 3079 (Sebastian, B., Kharb, P., O'Dea, C. P., Colbert, E. J. M., and Baum, S. A., 2019, ApJ, 883, 189)
(3) Radio continuum emission from local analogs of high-z faint LAEs: Blueberry galaxies (Sebastian, B., and Bait, O., 2019, ApJ Letters, 882, L19)
(4) GMRT Low-frequency Imaging of an Extended Sample of X-shaped Radio Galaxies (Lal, D. V., Sebastian, B., Cheung, C. C., and Pramesh Rao, A., 2019, AJ, 157, 195)
(5) Non-thermal emission from massive star-forming regions: a possible SNR candidate G351.7-1.2? (Veena, V. S., Vig, S., Sebastian, B., Lal, D. V., Tej, A., and Ghosh, S. K., 2019, MNRAS, 482, 4630)
(6) A Curved 150 pc Long Jet in the Double-peaked Emission-line AGN KISSR 434 (Kharb, P., Vaddi, S., Sebastian, B., Subramanian, S., Das, M., and Paragi, Z., 2019, ApJ,
871, 249)
(7) Discovery of a new, 2.2 Mpc Giant Radio Galaxy at a redshift of 0.56 (Sebastian, B., Ishwara-Chandra, C. H., Joshi, R., and Wadadekar, Y., 2018, MNRAS, 473, 4926)
(8) Giant Metrewave Radio Telescope observations of head-tail radio galaxies (Sebastian, B., Lal, D. V., and Rao, A. P., 2017, AJ, 154, 169)
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