%0 Generic %1 gentry2016enhanced %A Gentry, Eric S. %A Krumholz, Mark R. %A Dekel, Avishai %A Madau, Piero %D 2016 %K SN clustering feedback %T Enhanced Momentum Feedback from Clustered Supernovae %U http://arxiv.org/abs/1606.01242 %X Massive stars are typically in star clusters and live short lives, so the supernovae (SNe) they produce are clustered in space and time. Since the amount of momentum that SNe can deliver to the interstellar medium depends on how their outflowing remnants make the transition from adiabatic to radiative, this clustering may alter the momentum budget per SN, an effect we systematically explore over a large parameter space. We perform a parameter study of 1D hydrodynamic simulations, varying the number of SNe, and the background gas metallicity and density. For a few SNe, we find that the asymptotic momentum scales superlinearly with the number of SNe. As a result, the asymptotic momentum per SN can be an order of magnitude greater than that delivered by isolated SNe, with a maximum efficiency occurring for clusters that produce ~10-100 SNe. Adequately capturing this effect in simulations requires very high resolution to avoid over-cooling (a typical resolution for our simulations is 0.3 pc). We show that inadequate resolution led a number of previous studies to underestimate the momentum injection. This strong momentum feedback has significant implications for galactic and cosmological models, so we use our numeric results to construct a simple analytic fitting formula for the momentum of clustered SNe for use in semi-analytic and lower-resolution numeric work. Integrating our model over a realistic cluster mass function for a star-forming galaxy, we find that the total SNe momentum budget is ~0.5-1 dex higher than the conventional value.

@misc{gentry2016enhanced, abstract = {Massive stars are typically in star clusters and live short lives, so the supernovae (SNe) they produce are clustered in space and time. Since the amount of momentum that SNe can deliver to the interstellar medium depends on how their outflowing remnants make the transition from adiabatic to radiative, this clustering may alter the momentum budget per SN, an effect we systematically explore over a large parameter space. We perform a parameter study of 1D hydrodynamic simulations, varying the number of SNe, and the background gas metallicity and density. For a few SNe, we find that the asymptotic momentum scales superlinearly with the number of SNe. As a result, the asymptotic momentum per SN can be an order of magnitude greater than that delivered by isolated SNe, with a maximum efficiency occurring for clusters that produce ~10-100 SNe. Adequately capturing this effect in simulations requires very high resolution to avoid over-cooling (a typical resolution for our simulations is 0.3 pc). We show that inadequate resolution led a number of previous studies to underestimate the momentum injection. This strong momentum feedback has significant implications for galactic and cosmological models, so we use our numeric results to construct a simple analytic fitting formula for the momentum of clustered SNe for use in semi-analytic and lower-resolution numeric work. Integrating our model over a realistic cluster mass function for a star-forming galaxy, we find that the total SNe momentum budget is ~0.5-1 dex higher than the conventional value.}, added-at = {2016-06-07T09:58:31.000+0200}, author = {Gentry, Eric S. and Krumholz, Mark R. and Dekel, Avishai and Madau, Piero}, biburl = {https://www.bibsonomy.org/bibtex/2745fe23c98301668ba6bdfacc6b25c83/miki}, description = {[1606.01242] Enhanced Momentum Feedback from Clustered Supernovae}, interhash = {474abf5612894cb570894422abc248da}, intrahash = {745fe23c98301668ba6bdfacc6b25c83}, keywords = {SN clustering feedback}, note = {cite arxiv:1606.01242Comment: 16 pages, 22 figures, submitted to MNRAS}, timestamp = {2016-06-07T09:58:31.000+0200}, title = {Enhanced Momentum Feedback from Clustered Supernovae}, url = {http://arxiv.org/abs/1606.01242}, year = 2016 }