%0 Generic %1 benitezllambay2012dwarf %A Benitez-Llambay, Alejandro %A Navarro, Julio F. %A Abadi, Mario G. %A Gottloeber, Stefan %A Yepes, Gustavo %A Hoffman, Yehuda %A Steinmetz, Matthias %D 2012 %K cosmic dwarf galaxy ram-pressure simulation web %T Dwarf Galaxies and the Cosmic Web %U http://arxiv.org/abs/1211.0536 %X 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 Łambda 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.

@misc{benitezllambay2012dwarf, abstract = {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.}, added-at = {2012-11-05T16:46:48.000+0100}, author = {Benitez-Llambay, Alejandro and Navarro, Julio F. and Abadi, Mario G. and Gottloeber, Stefan and Yepes, Gustavo and Hoffman, Yehuda and Steinmetz, Matthias}, biburl = {https://www.bibsonomy.org/bibtex/24ca25cc601c8ccd99d130f4ef4bdc1fa/miki}, description = {[1211.0536] Dwarf Galaxies and the Cosmic Web}, interhash = {9af3d80c0f23baad070d7fec68da0e77}, intrahash = {4ca25cc601c8ccd99d130f4ef4bdc1fa}, keywords = {cosmic dwarf galaxy ram-pressure simulation web}, note = {cite arxiv:1211.0536Comment: 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}, timestamp = {2012-11-05T16:46:48.000+0100}, title = {Dwarf Galaxies and the Cosmic Web}, url = {http://arxiv.org/abs/1211.0536}, year = 2012 }