%0 Generic %1 wetzel2016reconciling %A Wetzel, Andrew R. %A Hopkins, Philip F. %A Kim, Ji-hoon %A Faucher-Giguere, Claude-Andre %A Keres, Dusan %A Quataert, Eliot %D 2016 %K baryons lcdm milky satellites way %T Reconciling dwarf galaxies with LCDM cosmology: Simulating a realistic population of satellites around a Milky Way-mass galaxy %U http://arxiv.org/abs/1602.05957 %X Low-mass "dwarf" galaxies represent the most significant challenges to the cold dark matter (CDM) model of cosmological structure formation. Because these faint galaxies are (best) observed within the Local Group of the Milky Way (MW) and Andromeda (M31), understanding their formation in such an environment is critical. We present the first results from the Latte Project: the Milky Way on FIRE (Feedback in Realistic Environments). This simulation models the formation of a MW-mass galaxy to z = 0 within LCDM cosmology, including dark matter, gas, and stars at unprecedented resolution: baryon mass of 7070 M_sun at spatial resolution down to 1 pc. Latte was simulated using the GIZMO code with a mesh-free method for accurate hydrodynamics and the FIRE model for star formation and explicit feedback within a multi-phase interstellar medium. For the first time, Latte self-consistently resolves the internal structure of dwarf galaxies that form around a MW-mass host down to M_star > 10^5 M_sun. Latte's population of dwarf galaxies agrees well with those observed in the Local Group across a broad range of properties: (1) distributions of stellar masses and stellar velocity dispersions (dynamical masses), including their joint relation, (2) the mass-metallicity relation, and (3) a diverse range of star-formation histories, including their mass dependence. Thus, Latte produces a realistic population of dwarf galaxies at M_star > 10^5 M_sun that does not suffer from the "missing satellites" or "too big to fail" problems of small-scale structure formation. We conclude that baryonic physics can reconcile observed dwarf galaxies with standard LCDM cosmology.

@misc{wetzel2016reconciling, abstract = {Low-mass "dwarf" galaxies represent the most significant challenges to the cold dark matter (CDM) model of cosmological structure formation. Because these faint galaxies are (best) observed within the Local Group of the Milky Way (MW) and Andromeda (M31), understanding their formation in such an environment is critical. We present the first results from the Latte Project: the Milky Way on FIRE (Feedback in Realistic Environments). This simulation models the formation of a MW-mass galaxy to z = 0 within LCDM cosmology, including dark matter, gas, and stars at unprecedented resolution: baryon mass of 7070 M_sun at spatial resolution down to 1 pc. Latte was simulated using the GIZMO code with a mesh-free method for accurate hydrodynamics and the FIRE model for star formation and explicit feedback within a multi-phase interstellar medium. For the first time, Latte self-consistently resolves the internal structure of dwarf galaxies that form around a MW-mass host down to M_star > 10^5 M_sun. Latte's population of dwarf galaxies agrees well with those observed in the Local Group across a broad range of properties: (1) distributions of stellar masses and stellar velocity dispersions (dynamical masses), including their joint relation, (2) the mass-metallicity relation, and (3) a diverse range of star-formation histories, including their mass dependence. Thus, Latte produces a realistic population of dwarf galaxies at M_star > 10^5 M_sun that does not suffer from the "missing satellites" or "too big to fail" problems of small-scale structure formation. We conclude that baryonic physics can reconcile observed dwarf galaxies with standard LCDM cosmology.}, added-at = {2016-02-22T10:01:31.000+0100}, author = {Wetzel, Andrew R. and Hopkins, Philip F. and Kim, Ji-hoon and Faucher-Giguere, Claude-Andre and Keres, Dusan and Quataert, Eliot}, biburl = {https://www.bibsonomy.org/bibtex/265dfb6ed6cb9ef52fb8a9983a5920c74/miki}, description = {[1602.05957] Reconciling dwarf galaxies with LCDM cosmology: Simulating a realistic population of satellites around a Milky Way-mass galaxy}, interhash = {38f1b47dd00cfd5d5bacb8f5e488ea08}, intrahash = {65dfb6ed6cb9ef52fb8a9983a5920c74}, keywords = {baryons lcdm milky satellites way}, note = {cite arxiv:1602.05957Comment: 6 pages, 5 figures. Submitted to ApJ Letters}, timestamp = {2016-02-22T10:01:31.000+0100}, title = {Reconciling dwarf galaxies with LCDM cosmology: Simulating a realistic population of satellites around a Milky Way-mass galaxy}, url = {http://arxiv.org/abs/1602.05957}, year = 2016 }