J/ApJS/222/2 NIR sources in the northeastern part of LMC (Kim+, 2016)
Near-infrared polarization source catalog of the northeastern regions of
the Large Magellanic Cloud.
Kim J., Jeong W.-S., Pak S., Park W.-K., Tamura M.
<Astrophys. J. Suppl. Ser., 222, 2 (2016)>
=2016ApJS..222....2K 2016ApJS..222....2K (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, infrared ; Polarization ; Magellanic Clouds ;
Proper motions ; Photometry, UBV
Keywords: infrared: ISM; infrared: stars; ISM: magnetic fields; ISM: structure;
Magellanic Clouds; polarization
Abstract:
We present a near-infrared band-merged photometric and polarimetric
catalog for the 39'x69' fields in the northeastern part of the Large
Magellanic Cloud (LMC), which were observed using SIRPOL, an imaging
polarimeter of the InfraRed Survey Facility. This catalog lists 1858
sources brighter than 14mag in the H band with a polarization
signal-to-noise ratio greater than three in the J, H, or Ks bands.
Based on the relationship between the extinction and the polarization
degree, we argue that the polarization mostly arises from dichroic
extinctions caused by local interstellar dust in the LMC. This catalog
allows us to map polarization structures to examine the global
geometry of the local magnetic field, and to show a statistical
analysis of the polarization of each field to understand its
polarization properties. In the selected fields with coherent
polarization position angles, we estimate magnetic field strengths in
the range of 3-25µG using the Chandrasekhar-Fermi method. This
implies the presence of large-scale magnetic fields on a scale of
around 100 parsecs. When comparing mid- and far-infrared dust emission
maps, we confirmed that the polarization patterns are well aligned
with molecular clouds around the star-forming regions.
Description:
We observed the northeastern regions of the LMC using the infrared
camera SIRIUS and the polarimeter SIRPOL at the Infrared Survey
Facility (IRSF) 1.4m telescope at the South African Astronomical
Observatory (SAAO) on 2008 December 25-30 and 2011 December 2-11; in
the J (1.25um), H (1.63um), and Ks (2.14um) bands.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 217 1858 Photometric and polarimetric catalog of the sources
on the northeastern regions in the LMC
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See also:
I/320 : SPM 4.0 Catalog (Girard+, 2011)
II/288 : IRSF Magellanic Clouds Point Source Catalog (Kato+ 2007)
J/AJ/144/179 : AKARI-LMC Point-source catalog (Kato+, 2012)
J/ApJ/759/25 : Rotation measures at 1.4GHz toward the LMC (Mao+, 2012)
J/ApJ/741/21 : Polarization of stars in Taurus (Chapman+, 2011)
J/ApJS/178/56 : CO observations of LMC Giant Molecular clouds (Fukui+, 2008)
J/ApJS/171/419 : Catalog of LMC HI clouds (Kim+, 2007)
J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Field Observation field name ({LMC/MC}nNN)
8- 13 A6 "YYMMDD" Date Observation date
15- 30 A16 --- Source Source identifier (HHMMSSss+DDMMSSs; J2000)
32- 40 F9.6 deg RAdeg [83.8/85.5] Right Ascension (J2000)
42- 51 F10.6 deg DEdeg [-70/-68.9] Declination (J2000)
53- 59 F7.4 mag Jmag [10.4/16.3] The J band magnitude
61- 66 F6.4 mag e_Jmag [0.001/0.04] Error in Jmag
68- 74 F7.4 mag Hmag [10.3/14] The J band magnitude
76- 81 F6.4 mag e_Hmag [0.0007/0.008] Error in Hmag
83- 89 F7.4 mag Ksmag [10/14] The Ks band magnitude
91- 96 F6.4 mag e_Ksmag [0.001/0.03] Error in Ksmag
98-102 F5.3 % JPdeg [0.5/9.4]? Polarization degree in J band
105 A1 --- l_JPdeg [<] Upper 3σ limit flag on JPdeg
106-111 F6.3 % e_JPdeg [0.1/10.3] Error in JPdeg
113-117 F5.3 % HPdeg [0.4/7.3]? Polarization degree in H band
119 A1 --- l_HPdeg [<] Upper 3σ limit flag on HPdeg
120-124 F5.3 % e_HPdeg [0.1/2.8] Error in HPdeg
126-130 F5.3 % KsPdeg [0.5/9.3]? Polarization degree in Ks band
132 A1 --- l_KsPdeg [<] Upper 3σ limit flag on KsPdeg
133-137 F5.3 % e_KsPdeg [0.1/6.6] Error in KsPdeg
139-145 F7.3 deg JPA ? Polarization position angle in J band
147-151 F5.3 deg e_JPA ? Error in JPA
153-159 F7.3 deg HPA ? Polarization position angle in H band
161-165 F5.3 deg e_HPA ? Error in JPA
167-173 F7.3 deg KsPA ? Polarization position angle in Ks band
175-179 F5.3 deg e_KsPA ? Error in KsPA
181-186 F6.2 mas/yr pmRA [-69/63]? Absolute Proper motion in
Right Ascension (1)
188-192 F5.2 mas/yr e_pmRA [3/27]? Error in pmRA
194-199 F6.2 mas/yr pmDE [-87/109]? Absolute Proper motion in
Declination (1)
201-205 F5.2 mas/yr e_pmDE [3/26]? Error in pmDE
207-211 F5.2 mag Bmag [8.7/28.7]? The Johnson B band magnitude (1)
213-217 F5.2 mag Vmag [11.1/18.4]? The Johnson V band magnitude (1)
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Note (1): From the Southern Proper Motion (SPM) catalog (Vieira et al.
2010AJ....140.1934V 2010AJ....140.1934V; see I/320).
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 05-Feb-2016