%0 Generic %1 conaboy2022relative %A Conaboy, Luke %A Iliev, Ilian T. %A Fialkov, Anastasia %A Dixon, Keri L. %A Sullivan, David %D 2022 %K library %T Relative baryon-dark matter velocities in cosmological zoom simulations %U http://arxiv.org/abs/2207.11614 %X Supersonic relative motion between baryons and dark matter due to the decoupling of baryons from the primordial plasma after recombination affects the growth of the first small-scale structures. Large box sizes (greater than a few hundred Mpc) are required to sample the full range of scales pertinent to the relative velocity, while the effect of the relative velocity is strongest on small scales (less than a few hundred kpc). This separation of scales naturally lends itself to the use of `zoom' simulations, and here we present our methodology to self-consistently incorporate the relative velocity at the start time of the simulation as well as its cumulative effect from recombination through to the start time of the simulation. We also apply our methodology to a large-scale cosmological zoom simulation. In qualitative agreement with previous works, we find that the halo mass function and halo baryon fraction is suppressed when the relative velocity is included compared to when it is not. We also find a small delay, of the order of the lifetime of a $\sim$9 M$_ødot$ Population III star, in the onset of star formation in the case where the relative velocity is included.

@misc{conaboy2022relative, abstract = {Supersonic relative motion between baryons and dark matter due to the decoupling of baryons from the primordial plasma after recombination affects the growth of the first small-scale structures. Large box sizes (greater than a few hundred Mpc) are required to sample the full range of scales pertinent to the relative velocity, while the effect of the relative velocity is strongest on small scales (less than a few hundred kpc). This separation of scales naturally lends itself to the use of `zoom' simulations, and here we present our methodology to self-consistently incorporate the relative velocity at the start time of the simulation as well as its cumulative effect from recombination through to the start time of the simulation. We also apply our methodology to a large-scale cosmological zoom simulation. In qualitative agreement with previous works, we find that the halo mass function and halo baryon fraction is suppressed when the relative velocity is included compared to when it is not. We also find a small delay, of the order of the lifetime of a $\sim$9 M$_\odot$ Population III star, in the onset of star formation in the case where the relative velocity is included.}, added-at = {2022-07-26T10:55:07.000+0200}, author = {Conaboy, Luke and Iliev, Ilian T. and Fialkov, Anastasia and Dixon, Keri L. and Sullivan, David}, biburl = {https://www.bibsonomy.org/bibtex/267552dffb8da8dc3317c27ff7d56f4c1/gpkulkarni}, description = {Relative baryon-dark matter velocities in cosmological zoom simulations}, interhash = {683e57a066137b5b777ac4c0455fcedb}, intrahash = {67552dffb8da8dc3317c27ff7d56f4c1}, keywords = {library}, note = {cite arxiv:2207.11614Comment: 12 pages, 10 figures. Submitted to MNRAS, comments welcome}, timestamp = {2022-07-26T10:55:07.000+0200}, title = {Relative baryon-dark matter velocities in cosmological zoom simulations}, url = {http://arxiv.org/abs/2207.11614}, year = 2022 }