Dev R Sadaula

I am a postdoctoral research associate at NASA Goddard Space Flight Center (GSFC). I study Active Galactic Nuclei (AGN) with a focus on changing-look AGN, ionized outflows, and time-domain astrophysics. My research combines X-ray spectroscopy and multi-wavelength analysis using observatories such as XRISM, XMM-Newton, NICER, Swift, and NuSTAR to investigate AGN variability and the physical connection between the accretion disk, corona, and outflows. I am currently leading and contributing to the projects on the changing-look AGN 1ES 1927+654. A key aspect of my work is the development of a time-dependent photoionization framework for modeling warm absorbers, enabling density diagnostics through measured lags between continuum variability and absorber response. This approach presents a novel technique to study the structure, location, and evolution of AGN outflows and their role in feedback and galaxy evolution.