2013A&A...557A..82B


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST00:53:47

2013A&A...557A..82B - Astronomy and Astrophysics, volume 557A, 82-82 (2013/9-1)

Ks- and Lp-band polarimetry on stellar and bow-shock sources in the Galactic Center.

BUCHHOLZ R.M., WITZEL G., SCHOEDEL R. and ECKART A.

Abstract (from CDS):

Infrared observations of the Galactic center (GC) provide a unique opportunity to study stellar and bow-shock polarization effects in a dusty environment. The goals of this work are to present new Ks- and Lp-band polarimetry on an unprecedented number of sources in the central parsec of the GC, thereby expanding our previous results in the H- and Ks-bands. We use AO-assisted Ks- and Lp-band observations, obtained at the ESO VLT. High precision photometry and the new polarimetric calibration method for NACO allow us to map the polarization in a region of 8''x25'' (Ks) resp. 26''x28'' (Lp). These are the first polarimetric observations of the GC in the Lp-band in 30 years, with vastly improved spatial resolution compared to previous results. This allows resolved polarimetry on bright bow-shock sources in this area for the first time at this wavelength. We find foreground polarization to be largely parallel to the Galactic plane (Ks-band: 6.1% at 20°, Lp-band: 4.5% at 20°), in good agreement with our previous findings and with older results. The previously described Lp-band excess in the foregound polarization towards the GC could be confirmed here for a much larger number of sources. The bow-shock sources contained in the FOV seem to show a different relation between the polarization in the observed wavelength bands than what was determined for the foreground. This points to the different relevant polarization mechanisms. The resolved polarization patterns of IRS 5 and 10W match the findings we presented earlier for IRS 1W. Additionally, intrinsic Lp-band polarization was measured for IRS 1W and 21, as well as for other, less prominent mid-infrared-excess sources (IRS 2S, 2L, 5NE). The new data offer support for the presumed bow-shock nature of several of these sources (1W, 5, 5NE, 10W, 21) and for the model of bow-shock polarization presented in our last work.

Abstract Copyright:

Journal keyword(s): Galaxy: center - polarization - dust, extinction - infrared: stars

VizieR on-line data: <Available at CDS (J/A+A/557/A82): pollist.dat>

Status in Simbad:  will not be processed

Simbad objects: 47

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Number of rows : 47

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 909 0
2 GCIRS 30W IR 17 45 39.49 -29 00 21.6           ~ 2 0
3 [SNM2010] 2538 * 17 45 39.61 -29 00 18.8           ~ 1 0
4 GCIRS 34 WR* 17 45 39.632 -29 00 27.05           ~ 20 0
5 GCIRS 6E WR* 17 45 39.632 -29 00 27.05           Ofpe/WN9 59 0
6 GCIRS 2S * 17 45 39.69 -29 00 32.5           ~ 16 0
7 GCIRS 2 Em* 17 45 39.7540 -29 00 32.880           ~ 64 0
8 GCIRS 13 Em* 17 45 39.76 -29 00 29.8           ~ 123 0
9 GCIRS 2L * 17 45 39.778 -29 00 32.11           ~ 22 0
10 [SNM2010] 2245 * 17 45 39.78 -29 00 18.5           ~ 1 0
11 GCIRS 3 * 17 45 39.80 -29 00 23.9           ~ 136 0
12 [SNM2010] 1707 * 17 45 39.87 -29 00 19.7           ~ 1 0
13 [SNM2010] 2214 * 17 45 39.91 -29 00 18.1           ~ 1 0
14 GCIRS 29 IR 17 45 39.919 -29 00 26.86           ~ 25 0
15 [SNM2010] 1378 * 17 45 39.96 -29 00 20.5           ~ 1 0
16 GCIRS 7 * 17 45 39.987 -29 00 22.24           M2 337 0
17 [SNM2010] 2059 * 17 45 40.00 -29 00 18.4           ~ 1 0
18 GCIRS 16 Cl* 17 45 40.0 -29 00 28           ~ 293 0
19 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3266 3
20 [SNM2010] 1644 * 17 45 40.04 -29 00 19.6           ~ 1 0
21 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11004 0
22 GCIRS 16NW WR* 17 45 40.0454 -29 00 26.874           Ofpe/WN9 126 0
23 [SNM2010] 2257 * 17 45 40.05 -29 00 17.9           ~ 1 0
24 GCIRS 16C WR* 17 45 40.12 -29 00 27.6           Ofpe/WN9 163 1
25 GCIRS 16SW WR* 17 45 40.123 -29 00 29.09           Ofpe/WN9 140 0
26 [SNM2010] 628 * 17 45 40.15 -29 00 23.4           ~ 1 0
27 GCIRS 16SE1 WR* 17 45 40.181 -29 00 29.26           WC8/9 41 0
28 GCIRS 1 * 17 45 40.2 -29 00 27           ~ 66 0
29 GCIRS 21 WR* 17 45 40.222 -29 00 30.85           WC9 92 0
30 GCIRS 16NE WR* 17 45 40.26 -29 00 27.2           Ofpe/WN9 136 0
31 GCIRS 10 * 17 45 40.4 -29 00 24           ~ 34 0
32 GCIRS 1W Em* 17 45 40.442 -29 00 27.51           Be? 93 0
33 GCIRS 9 LP* 17 45 40.447 -29 00 34.49           M3III 98 0
34 [SNM2010] 788 * 17 45 40.48 -29 00 28.0           ~ 1 0
35 GCIRS 1C * 17 45 40.51 -29 00 27.1           ~ 3 0
36 GCIRS 10W * 17 45 40.5305 -29 00 23.001           ~ 43 0
37 [SNM2010] 3078 * 17 45 40.58 -29 00 18.1           ~ 1 0
38 GCIRS 10E * 17 45 40.65 -29 00 23.8           ~ 17 0
39 GCIRS 5 * 17 45 40.700 -29 00 18.51           ~ 54 0
40 GCIRS 5E IR 17 45 40.875 -29 00 18.96           ~ 6 0
41 GCIRS 5NE IR 17 45 41.020 -29 00 17.66           ~ 5 0
42 [SNM2010] 3909 * 17 45 41.04 -29 00 22.6           ~ 1 0
43 GCS 9 IR 17 45 50 -29 03.4           ~ 2 0
44 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 611 0
45 NAME Quintuplet Cluster OpC 17 46 13.9 -28 49 48           ~ 424 0
46 GCIRS 35 IR ~ ~           ~ 7 0
47 GCIRS 1NEE IR ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2019.10.21-00:53:47

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