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03-02-2022
Colloquium: A multifaceted view of the interplay between gas and radio AGN
| Submitter: | Suma Murthy |
| Description: | The interplay between the nuclear activity and the interstellar medium of galaxies plays an important role in their evolution: the gas accreting onto the dormant supermassive black hole turns it into an AGN and the ensuing activity is believed to starve the host galaxy of the fuel needed to form stars. Radio-loud AGN are considered in this context mostly for their role in heating the intergalactic medium and preventing the accretion of cold gas onto the host galaxy. However, since most of the radio sources remain embedded within the host galaxy for a long time, their impact on the ambient medium may not be ignored. We have been studying the nature of the interaction between the radio AGN and the ambient medium and its evolution with redshift. I will first present our detailed study of the conditions of cold gas in a nearby radio galaxy, B2 0258+35. This study of atomic and molecular gas in the nuclear region of this source showed, for the first time, that radio jets can single-handedly impact the gas in the host galaxy significantly, highlighting the kpc-scale feedback from radio AGN. I will then present our investigation into the redshift evolution of the trends in the incidence of neutral atomic gas in radio AGN. Our study suggests that the incidence and kinematics of HI in radio AGN do not evolve up to z ~ 0.4 and provides the first evidence for the evolution of the cold-gas content in radio AGN environments at z>0.7. |
| Copyright: | Suma Murthy |
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