Projects
credit: webbtelescope.org/images
NGC5972 jet feedback
August 2021 - February 2025
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Ali et al. 2025
Cartoon schematic diagram showing various mechanisms at play in NGC5972. The green helix represents the [O III] emission as observed from the HST image. The jet axis is indicated by the red line, and the radio emission is depicted by the dotted red lobes. The black clouds denote the shock regions perpendicular to the jet, as determined by BPT analysis. The red and blue structures represent the outflow region in the galaxy. The shocked cocoon is shown in yellow.
It is widely accepted that active galactic nuclei (AGN) feedback in the form of radio jets, radiation, and/or winds has a significant impact on the surrounding interstellar medium. However, the role of photoionization (by the accretion disk) vs that of shock ionization (by jets/winds) has not yet been unambiguously disentangled. Previous studies have shown that the spatial coincidence between optical and radio emission could indicate AGN jet/wind induced shock. However, there is a still lack of comprehensive understanding of the effects of highly energetic jets on the host and its immediate surroundings.
We intend to study the relationship between radio jets and the distribution and kinematics of the ionized gas in NGC5972, a "Voorwerp" galaxy. Our primary objective is to quantify the contribution of the jet to the feedback mechanism by analyzing the correlations between radio emission and optical [OIII] emission in extended emission line regions spanning several kiloparsecs. To achieve this, we are utilizing EVLA, GMRT polarization data and MUSE IFU spectroscopic data.
Probing Cosmology: Gravitational Lensing and Precision with GW+EM Lensed Signal
September 2023 - June 2024
For my M.Sc. thesis project, under the mentorship of Dr. Anupreeta More at IUCAA, Pune, we aim to employ gravitational lensing techniques to constrain the Hubble constant value. The project primarily involves generating realistic Hubble Space Telescope (HST) image simulations for various lens system configurations. A critical aspect of my work is to assess the accuracy of lens modeling, specifically in terms of inferring the uncertainties in the Fermat potential from lensed GW+EM systems. So far, we have made substantial progress, including the creation of mock data for different lensing configurations, optimization of the best-fit lens model using chi-square analysis, and the calculation of differences in the lensing potential.
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In our future work, we plan to investigate the influence of different lens mass models, including power-law density distributions, thereby enhancing our understanding of cosmological constraints. Additionally, we intend to adapt our optimization code to accommodate more complex lens models, considering perturbations to improve accuracy. Furthermore, expanding our dataset by generating and studying larger mock samples will enable us to draw more robust conclusions and enhance our lens modeling techniques, ultimately contributing to the precise determination of the Hubble constant.