Kavli Affiliate: Gregory J. Herczeg
| First 5 Authors: Chul-Hwan Kim, Jeong-Eun Lee, Carlos Contreras Peña, Doug Johnstone, Gregory J. Herczeg
| Summary:
Protostellar outflows often present a knotty appearance, providing evidence
of sporadic accretion in stellar mass growth. To understand the direct relation
between mass accretion and ejection, we analyze the contemporaneous accretion
activity and associated ejection components in B335. B335 has brightened in the
mid-IR by 2.5 mag since 2010, indicating increased luminosity, presumably due
to increased mass accretion rate onto the protostar. ALMA observations of 12CO
emission in the outflow reveal high-velocity emission, estimated to have been
ejected 4.6 – 2 years before the ALMA observation and consistent with the jump
in mid-IR brightness. The consistency in timing suggests that the detected
high-velocity ejection components are directly linked to the most recent
accretion activity. We calculated the kinetic energy, momentum, and force for
the ejection component associated with the most recent accretion activity and
found that at least, about 1.0% of accreted mass has been ejected. More
accurate information on the jet inclination and the temperature of the ejected
gas components will better constrain the ejected mass induced by the recently
enhanced accretion event.
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