Bibcode
Tapia, M.; Roth, M.; Bohigas, J.; Persi, P.
Referencia bibliográfica
Stellar Clusters & Associations: A RIA Workshop on Gaia. Proceedings. Granada, Spain, May 23 - 27, 2011. Edited by: Alfaro Navarro, E. J.; Gallego Calvente, A. T.; Zapatero Osorio, M. R., pp.156-160
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2011
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Descripción
New deep broad- and narrow-band (JHK and Br Gamma at 2.17 μm and H2
at 2.12 μm) images of the mid-infrared source G287.47-0.54 (Tr14-N4)
are presented and analysed along with archive 3.6 to 8 μm Spitzer
images. We demonstrate the presence of a compact (0.3 pc) embedded
infrared cluster with at least 72 young members. The age of the cluster
is around 10^5 years and >= 32% of the sources show significant
infrared excess emission. The SEDS of the two most luminous sources
indicate that these are Class I young stellar objects. We found a 0.05
pc-long disk with i ~ 40-70 deg around source #902, which is seen
directly through the dust disk only at Lambda >= 2.2. Most of its
near-IR radiation is scattered light from lobes on both sides of the
disk. A second YSO, #438, displays symmetrically elongated features that
seem to be caused by scattering, also suggesting the presence of a disk.
The young cluster G287.47-0.54 is embedded at the head of a dust pillar
where the interaction of a very massive cluster, in this case Tr 16,
with a dense molecular core has triggered a new star formation episode.
We suggest that the dense cloudlet is sticking out of the remnant giant
molecular cloud located at the far side of the northern Carina nebula.
Also, five small molecular hydrogen 2.12 μm emission knots with no
BrGamma counterpart are found in the vicinity of a nearby CO emission
peak. These shock excited knots evince the presence of mass outflows in
the region. At present, it is unclear whether the engine of this outflow
is a member of the cluster or rather a yet undetected, younger YSO
deeply embedded in the molecular core.