Tidal Disruption of Satellite Galaxies in a Semi-Analytic Model of Galaxy Formation - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: We introduce a new physical recipe into the De Lucia and Blaizot version ofthe Munich semi-analytic model built upon the Millennium dark mattersimulation: the tidal stripping of stellar material from satellite galaxiesduring mergers. To test the significance of the new physical process we apply aMonte Carlo Markov Chain parameter estimation technique constraining the modelwith the $K$-band luminosity function, $B-V$ colours and the black hole-bulgemass relation. The differences in parameter correlations, and in the allowedregions in likelihood space, reveal the impact of the new physics on the basicingredients of the model, such as the star-formation laws, feedback recipes andthe black hole growth model. With satellite disruption in place, we get a modellikelihood four times higher than in the original model, indicating that thenew process seems to be favoured by observations. This is achieved mainly dueto a reduction in black hole growth that produces a better agreement betweenthe properties of central black holes and host galaxies. Compared to thebest-fit model without disruption, the new model removes the excess of dwarfgalaxies in the original recipe with a more modest supernova heating. The newmodel is now consistent with the three observational data sets used toconstrain it, while significantly improving the agreement with observations forthe distribution of metals in stars. Moreover, the model now follows the buildup of intra-cluster light.



Autor: Bruno M. B. Henriques, Peter A. Thomas

Fuente: https://arxiv.org/







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