J/AJ/136/621 Near-infrared polarimetry of M42 (Kusakabe+, 2008)
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., Lucas P.
<Astron. J., 136, 621-630 (2008)>
=2008AJ....136..621K 2008AJ....136..621K
ADC_Keywords: Clusters, open ; Photometry, infrared ; Polarization
Keywords: circumstellar matter - infrared: stars - ISM: individual (M42) -
polarization - stars: formation
Abstract:
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.
Description:
We carried out NIR polarimetric observations of M42 using the imaging
polarimeter SIRPOL, the polarimetry mode of the SIRIUS camera on the
1.4m telescope IRSF, at the South African Astronomical Observatory
(SAAO), on the night of 2005 December 26.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 49 314 H band polarization list of 314 sources
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Hour of right ascension (J2000)
4- 5 I2 min RAm Minute of right ascension (J2000)
7- 11 F5.2 s RAs Second of right ascension (J2000)
13 A1 --- DE- Sign of the declination (J2000)
14- 15 I2 deg DEd Degree of declination (J2000)
17- 18 I2 arcmin DEm Arcminute of declination (J2000)
20- 23 F4.1 arcsec DEs Arcsecond of declination (J2000)
25- 29 F5.2 mag Hmag H band magnitude (1)
31- 34 F4.1 % Pol H band polarization percentage
36- 38 F3.1 % e_Pol Uncertainty in Pol
40- 42 I3 deg theta Polarization position angle
44- 45 I2 deg e_theta Uncertainty in theta
47- 49 I3 --- ID Source identification number (2)
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Note (1): All H band magnitude errors are less than 0.1mag. Missing ID
sources are low polarization signal-to-noise (S/N<2).
Note (2): In Simbad, sources identified as [KTK2008] JHHMMSS.ss+DDMMSS.s
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 23-Mar-2011