Star cluster versus field star formation in the nucleus of the prototype starburst galaxy M82 - AstrophysicsReport as inadecuate




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Abstract: We analyse high-resolution Hubble Space Telescope-Advanced Camera for Surveysimaging of the nuclear starburst region of M82, obtained as part of the HubbleHeritage mosaic made of this galaxy, in four filters Johnson-Cousinsequivalent B, V, and I broad bands, and an Halpha narrow-band filter, as wellas subsequently acquired U-band images. We find a complex system of ~150 starclusters in the inner few 100 pc of the galaxy. We do not find any conclusiveevidence of a cluster-formation epoch associated with the most recent starburstevent, believed to have occurred about 4-6 Myr ago. This apparent evidence ofdecoupling between cluster and field-star formation is consistent with the viewthat star cluster formation requires special conditions. However, we stronglycaution, and provide compelling evidence, that the `standard- simple stellarpopulation analysis method we have used significantly underestimates the trueuncertainties in the derived ages due to stochasticity in the stellar initialmass function and the corresponding sampling effects.



Author: S. Barker 1,2, R. de Grijs 1,3, M. Cervino 4 1 University of Sheffield, UK; 2 ING, La Palma; 3 NAOC-CAS, Beijing, China; 4 IAA-CS

Source: https://arxiv.org/







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