J/ApJS/220/17 Wide-field NIR polarimetry of ρ Oph cloud (Kwon+, 2015)
Wide-field infrared polarimetry of the ρ Ophiuchi cloud core.
Kwon J., Tamura M., Hough J.H., Nakajima Y., Nishiyama S., Kusakabe N.,
Nagata T., Kandori R.
<Astrophys. J. Suppl. Ser., 220, 17 (2015)>
=2015ApJS..220...17K 2015ApJS..220...17K (SIMBAD/NED BibCode)
ADC_Keywords: Polarization ; Infrared sources ; Molecular clouds
Keywords: circumstellar matter; infrared: stars; ISM: individual: "Ophiuchi";
ISM: structure; polarization; stars: formation
Abstract:
We conducted wide and deep simultaneous JHKs-band imaging
polarimetry of the ρ Ophiuchi cloud complex. Aperture polarimetry
in the JHKs band was conducted for 2136 sources in all three bands,
of which 322 sources have significant polarizations in all the JHKs
bands and have been used for a discussion of the core magnetic fields.
There is a positive correlation between degrees of polarization and
H-Ks color up to H-Ks∼3.5. The magnetic field structures in the
core region are revealed up to at least AV∼47mag and are
unambiguously defined in each sub-region (core) of Oph-A, Oph-B,
Oph-C, Oph-E, Oph-F, and Oph-AC. Their directions, degrees of
polarization, and polarization efficiencies differ but their changes
are gradual; thus, the magnetic fields appear to be connected from
core to core, rather than as a simple overlap of the different cloud
core components. Comparing our results with the large-scale field
structures obtained from previous optical polarimetric studies, we
suggest that the magnetic field structures in the core were distorted
by the cluster formation in this region, which may have been induced
by shock compression due to wind/radiation from the Scorpius-Centaurus
association.
Description:
Near-infrared polarimetry of the ρ Oph cloud core was carried out
in 2006 and 2008 with the imaging polarimeter SIRPOL mounted on the
Infrared Survey Facility (IRSF) 1.4m telescope at the South African
Astronomical Observatory (SAAO). IRSF/SIRPOL enables deep and
wide-field simultaneous imaging polarimetry in the JHKs bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 139 2136 Photometry and polarimetry of point-like sources
in the ρ Ophiuchi cloud core
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See also:
II/332 : c2d Spitzer final data release (DR4) (Evans+, 2003)
J/A+A/581/A30 : Herschel maps of rho Oph (Rebollido+, 2015)
J/ApJS/211/3 : NIR photometry variability in ρ Oph (Parks+, 2014)
J/AJ/148/122 : YSOVAR: infrared photometry in Lynds 1688 (Gunther+, 2014)
J/ApJ/775/84 : Polarization from stars behind IC63 nebula (Andersson+, 2013)
J/ApJ/741/35 : NIR photometry and polarization in NGC 2264 (Kwon+, 2011)
J/ApJ/720/1045 : Polarimetry toward sightlines through ChaI (Andersson+, 2010)
J/A+A/515/A75 : Low-mass pop. in ρ Oph cloud (Alves de Oliveira+, 2010)
J/ApJ/708/758 : Polarimetry of HH1-2 region (Kwon+, 2010)
J/ApJS/182/143 : SCUPOL Legacy polarimetry of SCUBA (Matthews+, 2009)
J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)
J/AJ/137/3149 : Near-infrared imaging polarimetry in S106 (Saito+, 2009)
J/AJ/136/621 : Near-infrared polarimetry of M42 (Kusakabe+, 2008)
J/A+A/485/155 : HK photometry of rho Oph PMS stars (Alves de Oliveira+, 2008)
J/A+A/472/519 : N2H+(1-0) maps of Ophiuchus main cloud (Andre+, 2007)
J/A+A/469/575 : Spitzer mid-IR spectra of 3 molecular clouds (Berne+, 2007)
J/ApJ/665/369 : Photopolarimetry of Southern Coalsack stars (Andersson+, 2007)
J/ApJ/566/993 : rho Oph (Lynds 1688) cluster NICMOS imaging (Allen+, 2002)
J/A+A/372/173 : ISOCAM obs. of the rho Ophiuchi cloud (Bontemps+, 2001)
J/A+A/359/113 : X-ray and IR study of Rho Oph dark cloud (Grosso+, 2000)
J/ApJS/112/109 : Rho Oph Near-IR Positions and Photometry (Barsony+, 1997)
J/A+A/216/44 : Walraven photometry in Sco-Cen association (De Geus+, 1989)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Source identifier (1)
6- 7 I2 h RAh Hour of Right Ascension (J2000) (2)
9- 10 I2 min RAm Minute of Right Ascension (J2000) (2)
12- 16 F5.2 s RAs Second of Right Ascension (J2000) (2)
18 A1 --- DE- Sign of the Declination (J2000)(2)
19- 20 I2 deg DEd Degree of Declination (J2000) (2)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000) (2)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000) (2)
30- 35 F6.3 mag Jmag [10.7/19.4]? The J band magnitude
37- 41 F5.3 mag e_Jmag [0/0.2]? Uncertainty in Jmag
43- 48 F6.3 mag Hmag [9.6/19.1] The H band magnitude
50- 54 F5.3 mag e_Hmag [0/0.09] Uncertainty in Hmag
56- 61 F6.3 mag Ksmag [8.9/17.3] The KS band magnitude
63- 67 F5.3 mag e_Ksmag [0/0.2] Uncertainty in Ksmag
69- 73 F5.2 % PJ [0.2/68.4]? Degree of polarization in J band
75- 79 F5.2 % e_PJ [0.02/26]? Uncertainty in PJ
81- 85 F5.2 % PH [0.09/38.2] Degree of polarization in H band
87- 91 F5.2 % e_PH [0.02/14] Uncertainty in PH
93- 97 F5.2 % PKs [0.02/43.2] Degree of polarization in KS band
99-103 F5.2 % e_PKs [0.02/15] Uncertainty in PKs
105-109 F5.1 deg PAJ ? Position angle of J band polarization
111-115 F5.1 deg e_PAJ [0.2/481]? Uncertainty in θ_J
117-121 F5.1 deg PAH Position angle of H band polarization
123-127 F5.1 deg e_PAH [0.1/407] Uncertainty in θ_H
129-133 F5.1 deg PAKs Position angle of KS band polarization
135-139 F5.1 deg e_PAKs [0.1/905] Uncertainty in θ_Ks
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Note (1): Sources are sorted by their declination. In this paper, sources with
P/δP>3 are used. If there is duplicated sources in the
overlapped region, we put their uncertainty first. Note that some
sources show very large degrees of polarization (>20%), especially
in the J-band, but the degrees of polarization of such sources also
show very large errors. Special care is necessary to use these
large-error and low-S/N data.
Note (2): Positions are from the JHKs image (Figure 2).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 06-Nov-2015