Free Access
Volume 576, April 2015
Article Number A20
Number of page(s) 18
Section Galactic structure, stellar clusters and populations
Published online 16 March 2015

Online material

Appendix A

Here we provide additional plots similar to the ones shown throughout the main body of the text, showing the principal results from the analysis of Sgr A* observations taken in the polarization mode (NACO), but using the entire data set without limitation to the only significant values.

thumbnail Fig. A.1

Left: altitude (elevation) of Sgr A* as a function of polarization angle as derived from all data. Right: total flux density as a function of polarization angle; the bin width in polarization angle is 15°. The values for individual measurements are shown as black dots. The mean values per bin are shown as red dots with error bars indicating the standard deviation, if the number of data points per bin is larger than 2.

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thumbnail Fig. A.2

Left: distribution of Ks-band polarization angles of Sgr A* for the entire data set. The red line shows the fit with a Gaussian distribution. Right: distribution of Ks-band polarization degrees of Sgr A* for the entire data set.

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thumbnail Fig. A.3

Left: histogram of polarized flux density (total flux density times polarization degree) for the whole data set after correction for stellar contamination. Right: same plot in logarithmic scale.

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Comparison between the figures in the main text and those shown here in the Appendix allows the reader to get an impression of the effect of selecting the most significant values for the analysis presented.

thumbnail Fig. A.4

Left: total flux density and degree of polarization relation for the entire data after correction for the offset. Right: total flux density and angle of polarization relation for the entire data after correction for the offset.

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thumbnail Fig. A.5

Approximate relation Δp ~ ptan(Δφ) between the mean uncertainty of the polarization angle Δφ and the polarization degree Δp. Here polarization degree p and polarization angle φ are projected on the sky.

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© ESO, 2015

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