Astron. J., 136, 621-630 (2008/August-0)
Near-infrared imaging polarimetry of M42: aperture polarimetry of point-like sources.
KUSAKABE N., TAMURA M., KANDORI R., HASHIMOTO J., NAKAJIMA Y., NAGATA T., NAGAYAMA T., HOUGH J. and LUCAS P.
Abstract (from CDS):
We have conducted aperture polarimetry of ∼500 stars of the Orion Nebula Cluster in M42 based on our wide-field (∼8'x8') JHKs-band polarimetry. Most of the near-infrared (NIR) polarizations are dichroic, with position angles of polarization agreeing, both globally and locally, with previous far-infrared (FIR) and submillimeter observations, having taken into account the 90° difference in angles between dichroic absorption and emission. This is consistent with the idea that both NIR dichroic polarizations and FIR/submillimeter thermal polarizations trace the magnetic fields in the OMC-1 region. The magnetic fields inferred from these observations show a pinch at scales less than 0.5 pc with a centroid near IRc2. The hourglass-shaped magnetic field pattern is explained by the models in which the magnetic field lines are dragged along with the contracting gas and then wound up by rotation in a disk. The highly polarized region to the northwest of IRc2 and the low-polarized region near the bright bar are also common among NIR and FIR/submillimeter data, although a few regions of discrepancy exist. We have also discerned ∼50 possible highly polarized sources whose polarizations are more likely to be intrinsic rather than dichroic. Their polarization efficiencies (P(H)/A(H)) are too large to be explained by the interstellar polarization. These include ten young brown dwarfs that suggest a higher polarization efficiency, which may present geometrical evidence for (unresolved) circumstellar structures around young brown dwarfs.
circumstellar matter - infrared: stars - ISM: individual: M42 - polarization - stars: formation
VizieR on-line data:
<Available at CDS (J/AJ/136/621): table1.dat>
Table 1: [KTK2008] JHHMMSS.ss+DDMMSS.s N=314.
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