J/A+A/534/A117 NIR polarimetry of sources near SgrA* (Buchholz+, 2011)
Adaptive-optics assisted near-infrared polarization measurements of sources in
the Galactic Center.
Buchholz R.M., Witzel G., Schoedel R., Eckart A., Bremer M., Muzic K.
<Astron. Astrophys. 534, A117 (2011)>
=2011A&A...534A.117B 2011A&A...534A.117B
ADC_Keywords: Stars, nearby ; Stars, early-type; Infrared sources; Polarization
Keywords: Galaxy: center - polarization - dust, extinction - infrared: stars
Abstract:
The Galactic Center offers unique opportunities to study stellar and
bow-shock polarization effects in a dusty environment.
The goals of this work are to provide near-infrared (NIR) polarimetry
of the stellar sources in the central parsec at the resolution of an
8m telescope for the first time, along with new insights into the
nature of the known bright bow-shock sources.
We use adaptive-optics assisted observations obtained at the ESO VLT
in the H- and Ks-band, applying both high-precision photometric
methods specifically developed for crowded fields and a newly
established polarimetric calibration for NACO to produce polarization
maps of the central 3"x10", in addition to spatially resolved
polarimetry and a flux variability analysis on the extended sources in
this region.
Description:
This table contains the H- and Ks-band polarization of sources in the
Galactic Center. For each source, the offset in Right Ascension and
Declination as well as the projected distance from Sgr A* are given
(in arcsec). The table also lists the source brightness in magnitudes
in the H- and Ks-band for orientation. Not every source is contained
in all three data-sets (one H-band, two Ks-band with different
field-of-view). Entries with the value " - " indicate that the source
is not contained in the respective data-set. Polarization degrees are
given in percent, polarization angles in degrees. The data is combined
from different epochs, so a small number of very fast moving sources
may be listed separately for each data-set.
Objects:
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RA (2000) DE Designation(s)
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17 45 40.0 -29 00 28 Sgr A* = NAME Sgr A*
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
pollist.dat 87 383 H- and Ks-band polarization parameters
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See also:
J/A+A/502/91 : Proper motions of stars near SgrA* (Schoedel+, 2009)
J/A+A/511/A18 : NIR observations of stars near SgrA* (Schoedel+, 2010)
Byte-by-byte Description of file: pollist.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Source number
5- 9 F5.2 arcsec oRA Right ascension offset from Sgr A* (1)
11- 16 F6.2 arcsec oDE Declination offset from Sgr A* (1)
18- 22 F5.2 arcsec Rp Projected distance from Sgr A*
24- 27 F4.1 mag Ksmag ?=- Apparent Ks-band magnitude
29- 31 F3.1 mag e_Ksmag ?=- Error of Ks-band magnitude
33- 36 F4.1 mag Hmag ?=- Apparent H-band magnitude
38- 40 F3.1 mag e_Hmag ?=- Error of H-band magnitude
42- 44 F3.1 % pKs1 ?=- Ks polarization degree (data-set 1)
46- 48 F3.1 % e_pKs1 ?=- Error of pKs1
50- 52 I3 deg paKs1 ?=- Ks polarization angle (data-set 1)
54- 55 I2 deg e_paKs1 ?=- Error of thetaKs1
57- 60 F4.1 % pKs2 ?=- Ks polarization degree (data-set 2)
62- 64 F3.1 % e_pKs2 ?=- Error of pKs2
66- 68 I3 deg paKs2 ?=- Ks polarization angle (data-set 2)
70- 71 I2 deg e_paKs2 ?=- Error of thetaKs2
73- 76 F4.1 % pH ?=- H polarization degree
78- 80 F3.1 % e_pH ?=- Error of pH
82- 84 I3 deg paH ?=- H polarization angle
86- 87 I2 deg e_paH ?=- Error of thetaH
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Note (1): Offset from SgrA* is 17:45:40.0409-29:00:28.118 (J2000)
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Acknowledgements:
Rainer M. Buchholz, buchholz(at)ph1.uni-koeln.de
(End) Rainer Buchholz [Univ. Koln, Germany], Patricia Vannier [CDS] 04-Aug-2011