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J/MNRAS/465/2471   Enhanced momentum feedback from clustered SN  (Gentry+, 2017)

Enhanced momentum feedback from clustered supernovae. Gentry E.S., Krumholz M.R., Dekel A., Madau P. <Mon. Not. R. Astron. Soc. 465, 2471 (2017)> =2017MNRAS.465.2471G (SIMBAD/NED BibCode)
ADC_Keywords: Models ; Supernovae Keywords: hydrodynamics - ISM: bubbles - ISM: supernova remnants Abstract: Young stars typically form in star clusters, so the supernovae (SNe) they produce are clustered in space and time. This clustering of SNe may alter the momentum per SN deposited in the interstellar medium (ISM) by affecting the local ISM density, which in turn affects the cooling rate. We study the effect of multiple SNe using idealized 1D hydrodynamic simulations which explore a large parameter space of the number of SNe, and the background gas density and metallicity. The results are provided as a table and an analytic fitting formula. We find that for clusters with up to ∼100 SNe, the asymptotic momentum scales superlinearly with the number of SNe, resulting in a momentum per SN which can be an order of magnitude larger than for a single SN, with a maximum efficiency for clusters with 10-100 SNe. We argue that additional physical processes not included in our simulations - self-gravity, breakout from a galactic disc, and galactic shear - can slightly reduce the momentum enhancement from clustering, but the average momentum per SN still remains a factor of 4 larger than the isolated SN value when averaged over a realistic cluster mass function for a star-forming galaxy. We conclude with a discussion of the possible role of mixing between hot and cold gas, induced by multidimensional instabilities or pre-existing density variations, as a limiting factor in the build-up of momentum by clustered SNe, and suggest future numerical experiments to explore these effects. Description: Key parameters, extracted from every simulation after all SN have occured and the momentum has reached a maximum. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file results.dat 132 672 SNe simulation results
Byte-by-byte Description of file: results.dat
Bytes Format Units Label Explanations
1- 13 E13.6 kg/m3 Dens Initial gas density 15- 27 E13.6 --- Met Initial gas metallicity 29- 41 E13.6 kg Mcl Cluster mass 43- 46 I4 --- NSNe Number of SNe 48- 60 E13.6 kg.m/s Momentum Peak momentum 62- 74 E13.6 s Time Time of peak momentum 76- 88 E13.6 m Rad SNR radius at time of peak momentum 90-102 E13.6 kg MSNR SNR mass at peak momentum 104-116 E13.6 J EkinSNR SNR kinetic energy at peak momentum 118-130 E13.6 J EintSNR SNR internal energy at peak momentum 132 I1 --- Flag [0/1] Simulation data quality flag (1)
Note (1): Simulation data quality flag as follows: 1 = successful 0 = unphysical
Acknowledgements: Eric Gentry, egentry(at)
(End) Eric Gentry [[UCSC], Patricia Vannier [CDS] 23-May-2016
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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