PON Potenziamento del Sardinia Radio Telescope
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Cerimonia Inaugurale SRT
Eventi
13 MAGGIO 2016 ore 11:00
Oggi Astro Chiacchiere!
AGN feedback through the cosmic times
Fabrizio Fiore (INAF- OA Roma)
Abstract
Why black holes in galactic nuclei have masses proportional to bulge masses
and luminosities? Why did galaxies at a certain point of their cosmological evolution, stop to form stars? What is the path(s) and the mechanism(s) leading the transition from gas rich, star-forming galaxies, to red passive galaxies, deprived of all their gas? Theory and few observations suggest that AGN driven super winds (=feedback) play a major role in all these transformations. The two main building blocks of this scenario are: 1) AGN winds, which inject energy in their environment; 2) the interaction of these flows with the galaxy interstellar matter, and its physical/chemical/geometrical modification. I will first review AGN winds seen in different gas phases and at different scales. I will then present searches for "direct" evidence of AGN feedback in bright nearby AGN, linking accretion and ejection occurring on sub-parsec scale in galaxy nuclei to the transformations occurring in the rest of the galaxy. I will finally plug these studies in the broader framework of AGN evolution and discuss the perspectives of extending these studies up to z=1-3, the golden epoch of AGN and galaxy activity.
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Oggi Astro Chiacchiere! è un incontro informale, a cadenza bisettimanale, tra il personale dell'Osservatorio Astronomico di Cagliari (staff, postdoc e studenti), che ha lo scopo di discutere argomenti di carattere prevalentemente scientifico, tecnologico e informatico. L'incontro si tiene solitamente il Martedì, alle ore 11, nella sala riunioni dell'Osservatorio Astronomico di Cagliari (stanza 55).
Why black holes in galactic nuclei have masses proportional to bulge masses
and luminosities? Why did galaxies at a certain point of their cosmological evolution, stop to form stars? What is the path(s) and the mechanism(s) leading the transition from gas rich, star-forming galaxies, to red passive galaxies, deprived of all their gas? Theory and few observations suggest that AGN driven super winds (=feedback) play a major role in all these transformations. The two main building blocks of this scenario are: 1) AGN winds, which inject energy in their environment; 2) the interaction of these flows with the galaxy interstellar matter, and its physical/chemical/geometrical modification. I will first review AGN winds seen in different gas phases and at different scales. I will then present searches for "direct" evidence of AGN feedback in bright nearby AGN, linking accretion and ejection occurring on sub-parsec scale in galaxy nuclei to the transformations occurring in the rest of the galaxy. I will finally plug these studies in the broader framework of AGN evolution and discuss the perspectives of extending these studies up to z=1-3, the golden epoch of AGN and galaxy activity.
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Oggi Astro Chiacchiere! è un incontro informale, a cadenza bisettimanale, tra il personale dell'Osservatorio Astronomico di Cagliari (staff, postdoc e studenti), che ha lo scopo di discutere argomenti di carattere prevalentemente scientifico, tecnologico e informatico. L'incontro si tiene solitamente il Martedì, alle ore 11, nella sala riunioni dell'Osservatorio Astronomico di Cagliari (stanza 55).
Per informazioni e/o contributi contattare pcastang@oa-cagliari.inaf.it