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The physics and life-cycle of local radio AGN PDF

40 Pages·2017·54.15 MB·English
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Netherlands Institute for Radio Astronomy The physics and life-cycle of local radio AGN Raffaella Morganti ASTRON and Kapteyn Institute (Groningen) ASTRON is part of the Netherlands Organisation for Scientific Research (NWO) R. Morganti - Low Frequency Conference | Bologna June 2017 Low frequencies for the study of nearby L AGN: physics and impact of these AGN a n e Hydra A e t a l . ( 2 0 Radio jets/lobes affect their surrounding medium on 0 4 ) different scales: 
 , W 0.5-7.0 keV i s from tens of pc to many hundred kpc 
 e 330 MHz e e.g. cavities and outflows t a 1.4 GHz l . ( Amplitude of their impact depends on a number of 2 0 0 7 parameters that we can explore at low radio frequencies ) W a g n e r & B i c k n Low frequencies: energetics and the life-cycle 
 e l l ➔ occurrence of remnants and comparison with mock catalogues 
 2 0 ➔ restarted radio sources 1 1 R. Morganti - Low Frequency Conference | Bologna June 2017 c p 0 0 1 ~ Life of a radio galaxy Younger radio galaxies “Adult” radio galaxies c p 0 0 1 ~ Life of a radio galaxy Younger radio galaxies “Adult” radio galaxies c p 0 0 1 ~ Life of a radio galaxy Younger radio galaxies old (remnant) radio galaxies “Adult” radio galaxies c older lobe p 0 0 1 ~ Life of a radio 2 1 galaxy 0 2 . l a t e i k s v e l u h S Younger radio restarted, young galaxies radio source Restarted radio old (remnant) galaxies radio galaxies “Adult” radio galaxies older lobe c p 0 0 1 ~ 2 1 0 2 . l a t e i k s v e l u h S Younger radio restarted, young galaxies radio source Restarted radio old (remnant) galaxies radio galaxies “Adult” radio galaxies older lobe c p 0 0 1 ~ Affected by a number of uncertainties 
 2 1 0 (e.g. magnetic field and its structure, injection index, 
 2 . l a energy losses….) t e i k we need to know more about the physics 
 s v e l u and dependence on type of radio sources h S Younger radio restarted, young galaxies radio source Restarted radio old (remnant) galaxies radio galaxies High power radio sources Energetics and magnetic field: internal conditions (via X-ray inverse Compton) and environmental information (specifically external pressure) 
 ➔ linked to low frequencies ➔ electron dominated, relatively small deviation from equipartition, overpressure compared to external pressure ‣ we can now use radio properties alone to estimate internal energy of FRII ➔ to use for survey data! Ineson et al. 2017, Croston et al. 2017 R. Morganti - Low Frequency Conference | Bologna June 2017 Need for resolved studies to trace injection index… Better constrained spectrum at low frequencies. 
 Injection index (as derived from the lobe emission) remains steeper than classically assumed values even when considered on well resolved scales at low frequencies ➔ greater amount of energy is contained in the low-energy electron population than previously thought. Harwood et al. 2015, 2016 d o o w r a H y m 3C452 e r e J - z H M 0 5 1 R A F O L 2 5 4 C 3 absorption of hotspot emission and/or non-homogeneous and additional acceleration mechanisms See talk of Harwood R. Morganti - Low Frequency Conference | Bologna June 2017

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Low frequencies for the study of nearby. AGN: physics and impact of these AGN. Hydra A we need to know more about the physics and dependence on type of radio sources Results from morphology (no spectral info available) ➜ important the sensitivity to low surface brightness: e.g. Saripalli et al.
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