Abstract Details
| Name: Rahul Panchal Affiliation: Indian Institute of Space Science and Technology Conference ID: ASI2025_209 Title : The Circumgalactic Environment of a High HI Column Density Absorber at z = 0.614962 Authors and Co-Authors : Rahul Gautam Panchal 1, Anand Narayanan 1, Purvi Udhwani 1, Sayak Dutta 2, Sowgat Muzahid 2 Abstract Type : Poster Abstract Category : Galaxies and Cosmology Abstract : Probing the circumgalactic medium (CGM) is expected to improve our un- derstanding of the missing baryons and metals problem at the galactic scale. Galaxies harbour a much smaller fraction of baryons than the expected value given by the cos- mological ratio Ωb/Ωm . They are also seen to possess a fraction of the metals they produce over their lifetime. Using a combination of HST /COS far-ultraviolet spectrum of a background quasar and V LT /MUSE integral field spectroscopic data, we study the as- trophysical origin of a high HI column density absorber at z ≈ 0.61 which seems to trace the extended gaseous envelopes of more than one galaxy at that redshift. By modeling the chemical and physical properties of the absorbing gas, and through comparisons of the morphology, orientation, SFR, stellar masses, and kinematics of the galaxies with the absorber properties, we present our conclusions on the most likely scenario responsible for the absorption. |