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| Name | The Impact of Cosmic Rays on Ionized Gas in AGN and Star-Forming Galaxies - Evgenia Koutsoumpou |
| Video Uploader | Video From Cefcoloquios |
| Upload Date | This Video Uploaded At 03-10-2024 10:31:39 |
| Video Discription | Speaker: Evgenia Koutsoumpou (National and Kapodistrian University of Athens) Title: The Impact of Cosmic Rays on Ionized Gas in AGN and Star-Forming Galaxies Abstract: Cosmic Rays (CRs) in active galactic nuclei (AGN) are potentially impacting gas clouds within galaxies and are capable of regulating star formation. These non-thermal particles, accelerated by shocks, penetrate deep into the molecular gas, driving the heating and chemistry of the interstellar medium (ISM), and launching massive outflows. We examine the impact of CR feedback on ionized gas in a sample of nearby AGN and starburst galaxies. Using CLOUDY photoionization simulations, we inspect the ionization produced by low-energy CRs on the emission-lines in the optical range. Our model grids span a broad range in density (1 to 10^4 cm-3), ionization parameter (-3.5 ≤ logU ≤ -1.5) and CR ionization rate (10^-16 to 10^-12 s-1), and are compared with VLT/MUSE observations of prototypical galaxies (Centaurus A, NGC 1068, and NGC 253). Our study unveils that high CR ionization rates, as those expected in AGN and strong starbursts, can induce a secondary ionization layer beyond the photoionization-dominated regions, enhancing the emission of low-excitation transitions (e.g. [NII]λ6584). We find that AGN models with CRs reproduce the Seyfert locus in BPT diagrams without super-solar metallicities, contrasting pure photoionization models, whereas star-forming models can explain non-AGN sources in the LINER region. |
| Category | Science & Technology |
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