Formation et évolution stellaire des galaxies spirales barrées avec rétroaction de noyau actif

Authors: Robichaud, Fidèle
Advisor: Martel, Hugo
Abstract: Observations suggest that the bar is a very common structure among spiral galaxies, finding itself in near half of the spiral galaxies of the nearby Universe. The presence of a bar has an important impact on the secular evolution of the host galaxy because the latter modifies the spatial distribution of the material and creates a stream of gas toward the center of the galaxy, causing a positive feedback on the central star formation in the galaxy. Another very common structure in galaxies is an active galactic nucleus (AGN), a supermassive black hole in the center of the galaxy, which interacts with matter around it and the feedback from this interaction forms a very bright region in the center of the galaxy. Feedback from the AGN will warm up the surrounding gas by radiation and it can also apply a kinetic kick on it, pushing it outward from the center of the galaxy. However, the effect from the AGN on the evolution of the galaxy and its central star formation is still a misunderstood subject and we still do not know if the effect of the feedback on stellar formation is positive or negative. As part of this work, I made a total of 12 simulations of spiral galaxies of equal mass, which 10 of them were barred. The aim is to verify what is the effect of AGN by varying strength, available gas fraction, and the impact of the bar on the central and global star formation rate in the galaxy. The results of my simulations show that the presence of AGN would have a rather positive effect on star formation in barred spiral galaxy, and especially when the galaxy is still at an early stage of its evolution. However, in the case of a non-barred spiral galaxy, the effect would be opposite, negative in the center and generally negligible.
Document Type: Mémoire de maîtrise
Issue Date: 2016
Open Access Date: 24 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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