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Cerimonia Inaugurale SRT
Eventi
3 OTTOBRE 2017 ore 15:00
Colloquium
Cold gas in the center of radio-loud galaxies: New perspectives on triggering and feedback from HI
Dr. Filippo Maccagni (INAF-OAC, Italia)
During my PhD project, I made an inventory of the occurrence of neutral hydrogen (HI) traced by absorption in nearby radio galaxies, derived the properties of the gas and studied the interplay between the atomic and molecular gas and the active nucleus (AGN). In this talk, I will present two projects that aim to link the gas in the central regions of galaxies to the triggering, fuelling and feedback effects of the radio AGN.
The first project investigates the presence of HI absorption in a sample of radio AGN to link the properties of the lines to the the evolutionary stage of the radio activity as well as to the properties of the dust, that we inferred from the mid-infrared colours of the sources. I will present a comprehensive statistics of HI outflows, albeit derived from shallow observations. I will also consider the sources where HI
absorption is not detected to perform stacking experiments that allow us to probe the general properties of HI in radio AGN.
The second project is a multi-wavelength study of a young radio AGN (PKS B17181-649) to understand how cold gas may trigger the radio nuclear activity. I observed the HI, the molecular hydrogen and the carbon monoxide gas. All these components indicate that cold gas is contributing to fuel the central nuclear activity. We found evidence for molecular clouds accreting onto the central supermassive black hole.
To conclude, I will discuss on the implications of the results of this thesis results on future research projects, with upcoming HI surveys from the SKA pathfinders/precursors.
The first project investigates the presence of HI absorption in a sample of radio AGN to link the properties of the lines to the the evolutionary stage of the radio activity as well as to the properties of the dust, that we inferred from the mid-infrared colours of the sources. I will present a comprehensive statistics of HI outflows, albeit derived from shallow observations. I will also consider the sources where HI
absorption is not detected to perform stacking experiments that allow us to probe the general properties of HI in radio AGN.
The second project is a multi-wavelength study of a young radio AGN (PKS B17181-649) to understand how cold gas may trigger the radio nuclear activity. I observed the HI, the molecular hydrogen and the carbon monoxide gas. All these components indicate that cold gas is contributing to fuel the central nuclear activity. We found evidence for molecular clouds accreting onto the central supermassive black hole.
To conclude, I will discuss on the implications of the results of this thesis results on future research projects, with upcoming HI surveys from the SKA pathfinders/precursors.