Are molecular outflows around high-mass stars driven by ionization
feedback?
release_yntkivei6rbszhsiprbnz6ozey
by
Thomas Peters,
Pamela D. Klaassen,
Mordecai-Mark Mac Low,
Ralf S.
Klessen,
Robi Banerjee
2012
Abstract
The formation of massive stars exceeding 10 solar masses usually results in
large-scale molecular outflows. Numerical simulations, including ionization, of
the formation of such stars show evidence for ionization-driven molecular
outflows. We here examine whether the outflows seen in these models reproduce
the observations. We compute synthetic ALMA and CARMA maps of CO emission lines
of the outflows, and compare their signatures to existing single-dish and
interferometric data. We find that the ionization-driven models can only
reproduce weak outflows around high-mass star-forming regions. We argue that
expanding H II regions probably do not represent the dominant mechanism for
driving observed outflows. We suggest instead that observed outflows are driven
by the collective action of the outflows from the many lower-mass stars that
inevitably form around young massive stars in a cluster.
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1209.5858v1
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