Bondi–Hoyle accretion in a turbulent, magnetized medium

Burleigh, Kaylan J.; McKee, Christopher F.; Cunningham, Andrew J.; Lee, Aaron T.; Klein, Richard I.

doi:10.1093/mnras/stx439

Bondi–Hoyle accretion in a turbulent, magnetized medium

Journal Article · Tue Feb 21 00:00:00 EST 2017 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stx439· OSTI ID:1523828

Burleigh, Kaylan J. ^[1]; McKee, Christopher F. ^[2]; Cunningham, Andrew J. ^[3]; Lee, Aaron T. ^[2]; Klein, Richard I. ^[4]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of California, Berkeley, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

We introduce simulations of accretion on to point masses embedded in an isothermal gas that is magnetized and supersonically turbulent, as occurs for protostars in molecular clouds. We use the ORION2 adaptive mesh refinement (AMR) code to carry out ideal magnetohydrodynamic simulations for an rms Mach number $$\mathcal{M}$$_rms=5 and a wide range of Alfvén Mach numbers. We find that the probability density functions for accretion rates in all models are very wide (±0.5 dex) and asymmetric, tilted to low accretion rates; the mean accretion rate is about twice the median. We find that the results of Lee et al. for magnetized Bondi-Hoyle accretion with the relative velocity parallel to the field describe our results to within a factor of 2, and we suggest that this should be valid at least for $$\mathcal{M}$$_rms ≲ 10. Our results demonstrate that turbulent magnetic fields of the strength observed in molecular clouds reduce the accretion rate relative to the classical Bondi-Hoyle rate by a factor of a few for Alfvén Mach numbers of order unity, but this is comparable to the reduction due to supersonic hydrodynamic turbulence alone. This reduction in accretion rates should be taken into account in analytic models of competitive accretion and analytic estimates of the accretion luminosities of young stellar objects in molecular clouds.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231; AC52-07NA27344

OSTI ID:: 1523828

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 468; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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