TY - JOUR
T1 - Complex Scattered Radiation Fields And Multiple Magnetic Fields In The Protostellar Cluster In NGC 2264
AU - KWON, Jungmi
AU - Tamura, M.
AU - Kandori, R.
AU - Kusakabe, N.
AU - Hashimoto, J.
AU - Nakajima, Y.
AU - Nakamura, F.
AU - Nagayama, T.
AU - Nagata, T.
AU - Hough, J. H.
AU - Werner, M. W.
AU - Teixeira, P. S.
PY - 2012/5/1
Y1 - 2012/5/1
N2 - Near-infrared imaging polarimetry in the J, H, and Ks bands has been
carried out for the protostellar cluster region around NGC 2264 IRS 2 in
the Monoceros OB1 molecular cloud. Various infrared reflection nebula
clusters (IRNCs) associated with NGC 2264 IRS 2 and the IRAS 12 S1 core,
as well as local infrared reflection nebulae (IRNe), were detected. The
illuminating sources of the IRNe were identified with known or new near-
and mid-infrared sources. In addition, 314 point-like sources were
detected in all three bands and their aperture polarimetry was studied.
Using a color-color diagram, reddened field stars and diskless
pre-main-sequence stars were selected to trace the magnetic field
structure of the molecular cloud. The mean polarization position angle
of the point-like sources is 80 degrees in the cluster core, and 60
degrees in the perimeter of the cluster core, which is interpreted as
the projected direction on the sky of the magnetic field in the observed
region of the cloud. The Chandrasekhar-Fermi method gives a rough
estimate of the magnetic field strength to be about 100 micro-Gauss. A
comparison with recent numerical simulations of the cluster formation
implies that the cloud dynamics is controlled by the relatively strong
magnetic field. The local magnetic field direction is well associated
with that of CO outflow for IRAS 12 S1 and consistent with that inferred
from submillimeter polarimetry. In contrast, the local magnetic field
direction runs roughly perpendicular to the Galactic magnetic field
direction.
AB - Near-infrared imaging polarimetry in the J, H, and Ks bands has been
carried out for the protostellar cluster region around NGC 2264 IRS 2 in
the Monoceros OB1 molecular cloud. Various infrared reflection nebula
clusters (IRNCs) associated with NGC 2264 IRS 2 and the IRAS 12 S1 core,
as well as local infrared reflection nebulae (IRNe), were detected. The
illuminating sources of the IRNe were identified with known or new near-
and mid-infrared sources. In addition, 314 point-like sources were
detected in all three bands and their aperture polarimetry was studied.
Using a color-color diagram, reddened field stars and diskless
pre-main-sequence stars were selected to trace the magnetic field
structure of the molecular cloud. The mean polarization position angle
of the point-like sources is 80 degrees in the cluster core, and 60
degrees in the perimeter of the cluster core, which is interpreted as
the projected direction on the sky of the magnetic field in the observed
region of the cloud. The Chandrasekhar-Fermi method gives a rough
estimate of the magnetic field strength to be about 100 micro-Gauss. A
comparison with recent numerical simulations of the cluster formation
implies that the cloud dynamics is controlled by the relatively strong
magnetic field. The local magnetic field direction is well associated
with that of CO outflow for IRAS 12 S1 and consistent with that inferred
from submillimeter polarimetry. In contrast, the local magnetic field
direction runs roughly perpendicular to the Galactic magnetic field
direction.
M3 - Article
VL - 220
JO - American Astronomical Society, AAS Meeting #220
JF - American Astronomical Society, AAS Meeting #220
ER -