2022ApJ...924...50B -
Astrophys. J., 924, 50-50 (2022/January-2)
Supersonic expansion of the bipolar H II region Sh2-106: a 3500 year old explosion?
BALLY J., CHIA Z., GINSBURG A., REIPURTH B., TANAKA K.E.I., ZINNECKER H. and FAULHABER J.
Abstract (from CDS):
Multi-epoch narrowband Hubble Space Telescope images of the bipolar H II region Sh2-106 reveal highly supersonic nebular proper motions that increase with projected distance from the massive young stellar object S106 IR, reaching over ∼30 mas yr–1 (∼150 km s–1 at D = 1.09 kpc) at a projected separation of ∼1.'4 (0.44 pc) from S106 IR. We propose that S106 IR experienced a ∼1047 erg explosion ∼3500 yr ago. The explosion may be the result of a major accretion burst or a recent encounter with another star, or a consequence of the interaction of a companion with the bloated photosphere of S106 IR as it grew from ∼10 through ∼15 M☉ at a high accretion rate. Near-IR images reveal fingers of H2 emission pointing away from S106 IR and an asymmetric photon-dominated region surrounding the ionized nebula. Radio continuum and Brγ emission reveal a C-shaped bend in the plasma, indicating either the motion of S106 IR toward the east, or the deflection of plasma toward the west by the surrounding cloud. The H II region bends around a ∼1' diameter dark bay west of S106 IR that may be shielded from direct illumination by a dense molecular clump. Herbig-Haro and Molecular Hydrogen Objects tracing outflows powered by stars in the Sh2-106 protocluster such as the Class 0 source S106 FIR are discussed.
Abstract Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
Journal keyword(s):
H II regions
Status at CDS
:
Examining the need for a new acronym. // Large table(s) will be appraised for possible ingestion in VizieR.
Simbad objects:
29
Full paper
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