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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/23420
Title: From discs to bulges: effect of mergers on the morphology of galaxies
Authors: Kannan, Rahul
Macciò, Andrea V.
FONTANOT, Fabio 
Moster, Benjamin P.
Karman, Wouter
Somerville, Rachel S.
Issue Date: 2015
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 452
Issue: 4
First Page: 4347
Abstract: We study the effect of mergers on the morphology of galaxies by means of the simulated merger tree approach first proposed by Moster et al. This method combines N-body cosmological simulations and semi-analytic techniques to extract realistic initial conditions for galaxy mergers. These are then evolved using high-resolution hydrodynamical simulations, which include dark matter, stars, cold gas in the disc and hot gas in the halo. We show that the satellite mass accretion is not as effective as previously thought, as there is substantial stellar stripping before the final merger. The fraction of stellar disc mass transferred to the bulge is quite low, even in the case of a major merger, mainly due to the dispersion of part of the stellar disc mass into the halo. We confirm the findings of Hopkins et al., that a gas-rich disc is able to survive major mergers more efficiently. The enhanced star formation associated with the merger is not localized to the bulge of galaxy, but a substantial fraction takes place in the disc too. The inclusion of the hot gas reservoir in the galaxy model contributes to reducing the efficiency of bulge formation. Overall, our findings suggest that mergers are not as efficient as previously thought in transforming discs into bulges. This possibly alleviates some of the tensions between observations of bulgeless galaxies and the hierarchical scenario for structure formation.
URI: http://hdl.handle.net/20.500.12386/23420
URL: https://academic.oup.com/mnras/article/452/4/4347/1065674
ISSN: 0035-8711
DOI: 10.1093/mnras/stv1633
Bibcode ADS: 2015MNRAS.452.4347K
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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