%0 Generic %1 Pichon2011 %A Pichon, C. %A Pogosyan, D. %A Kimm, T. %A Slyz, A. %A Devriendt, J. %A Dubois, Y. %D 2011 %K accretion cosmology disk simulation thin %T Rigging dark halos: why is hierarchical galaxy formation consistent with the inside-out build-up of thin discs? %U http://arxiv.org/abs/1105.0210 %X State-of-the-art hydrodynamical simulations show that gas inflow through the virial sphere of dark matter halos is focused (i.e. has a preferred inflow direction), consistent (i.e. its orientation is steady in time) and amplified (i.e. the amplitude of advected specific angular momentum increases with time). This is a consequence of the dynamics of the cosmic web within the neighbourhood of the halo, which produces steady, angular momentum rich, filamentary inflow of cold gas. On large scales, the dynamics within neighbouring patches drives matter out of the surrounding voids, into walls and filaments before it finally gets accreted onto virialised dark matter halos. As these walls/filaments constitute the boundaries of asymmetric voids, they naturally acquire a net transverse motion, which explains the angular momentum rich nature of the later infall which comes from further away (lever effect). We argue that this large-scale driven consistency explains why cold flows are so efficient at building up thin discs from the inside out.

@misc{Pichon2011, abstract = { State-of-the-art hydrodynamical simulations show that gas inflow through the virial sphere of dark matter halos is focused (i.e. has a preferred inflow direction), consistent (i.e. its orientation is steady in time) and amplified (i.e. the amplitude of advected specific angular momentum increases with time). This is a consequence of the dynamics of the cosmic web within the neighbourhood of the halo, which produces steady, angular momentum rich, filamentary inflow of cold gas. On large scales, the dynamics within neighbouring patches drives matter out of the surrounding voids, into walls and filaments before it finally gets accreted onto virialised dark matter halos. As these walls/filaments constitute the boundaries of asymmetric voids, they naturally acquire a net transverse motion, which explains the angular momentum rich nature of the later infall which comes from further away (lever effect). We argue that this large-scale driven consistency explains why cold flows are so efficient at building up thin discs from the inside out. }, added-at = {2011-05-03T18:25:35.000+0200}, author = {Pichon, C. and Pogosyan, D. and Kimm, T. and Slyz, A. and Devriendt, J. and Dubois, Y.}, biburl = {https://www.bibsonomy.org/bibtex/2ad4f6b862643c8545b69a2bf564eb170/miki}, description = {[1105.0210] Rigging dark halos: why is hierarchical galaxy formation consistent with the inside-out build-up of thin discs?}, interhash = {a459e5fa76ccf8e40cf1a3f776a46ed3}, intrahash = {ad4f6b862643c8545b69a2bf564eb170}, keywords = {accretion cosmology disk simulation thin}, note = {cite arxiv:1105.0210 Comment: 13 pages, 14 figures}, timestamp = {2011-05-03T18:25:35.000+0200}, title = {Rigging dark halos: why is hierarchical galaxy formation consistent with the inside-out build-up of thin discs?}, url = {http://arxiv.org/abs/1105.0210}, year = 2011 }