A part of my PhD thesis involves the investigation of global signatures of Active Galactic Nuclei (AGN) feedback by looking at various scaling properties of the super-massive black hole (SMBH) and their host galaxies as well as dark matter halo. This work has mainly been done using cosmological hydrodynamical simulation.
Along with many interesting results, we show from the above plot that AGN feedback reduce the overall gas density surrounding SMBHs, increasing the gas temperature at the same time
You can check out the paper related to this work
I also study the imprint of AGN feedback on the diffuse X-ray emission from galaxy groups and clusters. I theoretically model X-ray emission using gas properties surrounding the black holes from cosmological hydrodynamical simulation. For a realistic comparison of the theoretical results with actual observation, I develop a synthetic observation technique of Chandra X-ray telescope starting from the cosmological simulation data.
Please find the publication based on this work
Please find the publication based on this work
In a different work, I try to study the influence of different modes of AGN feedback on their surrounding medium. Using a state-of-the-art cosmological simulation,I try to statistically study the imprint of radiative, jet and X-ray mode of feedback on the X-ray surface brightness profiles of diffuse gas surrounding the SMBH at galaxy groups and clusters scales. Find out more details by clicking this link iopscience.iop.org/article/10.3847/1538-4357/ac951c
This figure shows different X-ray emission in the presence of different modes of AGN feedback. Radiative, jet and X-ray feedback are present in the top left panel, radiative and jet mode of feedback are present in the top right panel, only radiative feedback is present in the bottom left panel whereas no AGN feedback is present in the bottom right panel.
This figure shows the observed light curves in the near-infra red regime in case different stars being disrupted by massive black holes at high redshift. Red solid, red dashed, blue solid and blue dashed lines represent the population III stars at z=10. Black solid line shows the case of a sun-like star. Red thin line shows the light curve when the disruption happens at z=15. Green and magenta dotted lines show the detection threshold of James Webb Space Telescope (F150W) and Roman Space Telescope (F106) respectively. It is interesting to note that the light curves stay above the detection limit of both the telescopes for a long period of time. For more details, please check out the paper
|
Other projects that I am currently working on -
1. Apply our previously developed synthetic observation technique to the upcoming X-ray missions such as XRISM, Athena, AXIS to study their performance on detecting the signatures of AGN feedback from the high redshift objects.
2. Study the recently discovered X-ray emitting objects known as Quasi Periodic Eruptions (QPE) and understand their origin by theoretical modelling.
3. Dependence of TDE rates on different parameters and constraining them using cosmological simulation
2. Study the recently discovered X-ray emitting objects known as Quasi Periodic Eruptions (QPE) and understand their origin by theoretical modelling.
3. Dependence of TDE rates on different parameters and constraining them using cosmological simulation