Optical polarization in the Orion Nebula

Pallister, W. S.; Perkins, H. G.; Scarrott, S. M.; Bingham, R. G.; Pilkington, J. D. H.

doi:10.1093/mnras/178.1.93p

Cited by 6 publications

(8 citation statements)

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“…The polarized radiation at shorter wavelengths (our J-band data and previous optical data by Pallister et al 1977) is dominated by scattered light from the Trapezium stars rather than that from the IRc2 protostars, as evidenced from the polarization vector patterns (Fig. 2).…”

Section: Polarized Orion Barsupporting

confidence: 69%

“…The polarized radiation at shorter wavelengths (our J band data and previous optical data by Pallister et al 1977) is dominated by scattered light from the Trapezium stars rather than that from the IRc2 protostars, as evidenced from the polarization vector patterns (Figure 2). Our polarization images show exactly where the scattering of this diffuse nebula (seen as white) occurs; it originates from the boundary between the ionization front and the background molecular cloud, OMC-1.…”

Section: Polarized Orion Barsupporting

confidence: 66%

“…Imaging polarimetry has been conducted either only at optical wavelengths (Pallister et al 1977) or toward a small region near IRc2 or BN at near-infrared wavelengths (Minchin et al 1991;Jiang et al 2005;Simpson et al 2006). In this Letter, we present for the first time the nearinfrared polarization images of a ∼1 pc region of M42 and describe newly detected features seen as infrared nebulae on various scales.…”

Section: Introductionmentioning

confidence: 93%

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Near-Infrared Polarization Images of the Orion Nebula

Tamura¹,

Kandori²,

Kusakabe³

et al. 2006

ApJ

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Wide-field (∼ ) and deep near-infrared ( bands) polarization images of the Orion Nebula are pre-8 # 8JHK s sented. These data revealed various circumstellar structures as infrared reflection nebulae (IRNe) around young stellar objects (YSOs), both massive and low-mass. We found the IRN around both IRc2 and BN to be very extensive, suggesting that there might be two extended (10.7 pc) bipolar/monopolar IRNe in these sources. We discovered at least 13 smaller scale (∼0.01-0.1 pc) IRNe around less massive YSOs, including the famous source v 2 Ori C. We also suggest the presence of many unresolved (!690 AU) systems around low-mass YSOs and young brown dwarfs showing possible intrinsic polarizations. Wide-field infrared polarimetry is thus demonstrated to be a powerful technique in revealing IRNe and hence potential disk/outflow systems among high-mass to substellar YSOs.

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Section: Polarized Orion Barsupporting

confidence: 69%

Section: Polarized Orion Barsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 93%

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Near-Infrared Polarization Images of the Orion Nebula

Tamura¹,

Kandori²,

Kusakabe³

et al. 2006

ApJ

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“…Imaging polarimetry of M42 has been conducted either only at optical wavelengths (Pallister et al 1977) or toward a small region near IRc2 or BN at NIR wavelengths Burton et al (1991), andChrysostomou et al (1994) measured the polarization of the H 2 v = 1-0 S(1) line at 2.12 µm around IRc2. They attributed the polarization in the vicinity of IRc2 to dichroic absorption and, in particular, the twist in the polarization vectors 5 east of IRc2 to a twist in the magnetic field direction.…”

Section: Introductionmentioning

confidence: 99%

“…Imaging polarimetry of M42 has been conducted either only at optical wavelengths (Pallister et al 1977) or toward a small region near IRc2 or BN at near-infrared wavelengths (Minchin et al 1991;Jiang et al 2005;Simpson et al 2006). Hough et al (1986), Burton et al (1991), and Chrysostomou et al (1994) measured the polarization of the H 2 v = 1-0 S(1) line at 2.12µm around IRc2.…”

Section: Introductionmentioning

confidence: 99%

Near-Infrared Imaging Polarimetry of M42: Aperture Polarimetry of Point-Like Sources

Kusakabe

Tamura

Kandori

et al. 2008

The Astronomical Journal

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We have conducted aperture polarimetry of ∼500 stars of the Orion Nebula Cluster in M42 based on our widefield (∼8 ×8 ) 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.

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Imaging polarimetry as a diagnostic tool

Gledhill¹

2008

Proc. IAU

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Abstract. Some of the earliest polarimetric measurements made in astronomy were concerned with the polarization of the interstellar medium resulting from dust grains aligned in the Galactic magnetic field. More than 50 years later, polarimetry continues to be an important diagnostic of field structure on size scales ranging from planetary to galactic. The use of both linear and circular polarimetry at optical and infrared wavelengths can provide additional insights into the nature of dust particles, their alignment in magnetic fields and the field topology. Given the science benefits that polarimetry offers it is perhaps surprising that the continued existence of polarimetric facilities on current and next generation large telescopes needs to be ensured.

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Optical polarization in the Orion Nebula

Cited by 6 publications

References 0 publications

Near-Infrared Polarization Images of the Orion Nebula

Near-Infrared Polarization Images of the Orion Nebula

Near-Infrared Imaging Polarimetry of M42: Aperture Polarimetry of Point-Like Sources

Imaging polarimetry as a diagnostic tool

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