CONTENTS
Skip menuWelcome !
I am a Post-doctoral fellow at the
Racah Institute of Physics,
Hebrew University of Jerusalem.
My research interest lies in theoretical understanding of the SN driven
bubbles/superbubble, galactic outflows and different physical processes in the interstellar
and circumgalactic medium (ISM/CGM). A frequent asssumption in modeling the ISM/CGM is
that the plasma is in collisional or photo-ionization equilibrium. While this in general
a good assumption in modeling the dynamics of the system, it is not a good assumption in
modeling the emission/absorption properties of the system. More recently, I have been
working on relaxing the assumption of ionization equilibrium and include non-equilibrium
ionization phsyics in dynamical systems.
Another aspect is the radiation field produced due to radiative cooling of plasma in the
ISM/CGM. The medium themselves are assumed to be optically thin i.e., radiation can escape
the system without suffering from serious abosrption or scattering. However, we generally
do not think what happens to the plasma. One can imagine that if the absorbed number of
photons (despite being a small fraction of the total number of photons) is comparable to the
particles that absorb them, the plasma will be significantly affected. As a part of
understanding the ISM/CGM properly, I built a frequency-dependent radiation transport
that is coupled to the ionization network and the dynamics.
One of my favourite topics related to the study of bubbles and outflows is the study of
Fermi Bubbles and other nearby large scale features seen in x-rays or UV lines. I built
a star-formation model for the Fermi Bubbles that could explain the gamma-rays, x-rays,
UV absorbing clouds and even consistent with radio emission from the bubbles and surrounding
area. The recently discovered eROSITA bubbles perfectly match with the theoretical model
that I provided.
Other activities
I am a volunteer at the Padakshep which supports meritorius but under-privilaged students in West Bengal for their education.