Dwarf Galaxies and the Cosmic Web

Дата и время публикации : 2012-11-02T19:56:27Z

Авторы публикации и институты :
Alejandro Benitez-Llambay
Julio F. Navarro
Mario G. Abadi
Stefan Gottloeber
Gustavo Yepes
Yehuda Hoffman
Matthias Steinmetz

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: Submitted to ApJL. 6 pages, 4 figures. A set of movies showing the interaction between dwarf galaxies and the Cosmic Web can be found at mirror 1 http://www.astro.uvic.ca/~mario/dwarf-web/ or at mirror 2 http://www.iate.oac.uncor.edu/~alejandro/dwarf-web/ . Comments are welcomed
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO

Краткий обзор статьи: We use a cosmological simulation of the formation of the Local Group of Galaxies to identify a mechanism that enables the removal of baryons from low-mass halos without appealing to feedback or reionization. As the Local Group forms, matter bound to it develops a network of filaments and pancakes. This moving web of gas and dark matter drifts and sweeps a large volume, overtaking many halos in the process. The dark matter content of these halos is unaffected but their gas can be efficiently removed by ram-pressure. The loss of gas is especially pronounced in low-mass halos due to their lower binding energy and has a dramatic effect on the star formation history of affected systems. This "cosmic web stripping" may help to explain the scarcity of dwarf galaxies compared with the numerous low-mass halos expected in Lambda CDM and the large diversity of star formation histories and morphologies characteristic of faint galaxies. Although our results are based on a single high-resolution simulation, it is likely that the hydrodynamical interaction of dwarf galaxies with the cosmic web is a crucial ingredient so far missing from galaxy formation models.

Category: Physics