NIR observations of stars near SgrA* (Schoedel+, 2010)

Details NIR observations of stars near SgrA* (Schoedel+, 2010) NIR observations of stars near SgrA* (Schoedel+, 2010)

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ycat..35119018s&link_type=abstract

VizieR On-line Data Catalog: J/A+A/511/A18. Originally published in: 2010A&A...511A..18S

Physics

Optics

Stars: Nearby, Stars: Early-Type, Infrared Sources, Photometry: Infrared

Scientific paper

The table tablea2.dat contains photometry in the H, Ks, and L'-bands for stars within a projected distance of approximately 1pc from the Galaxy's central black hole, Sagittarius A*. The data are based on observations with the NACO adaptive optics assisted near-infrared camera at the ESO VLT. Approximate astrometry for the stars is given relative to Sagittarius A*, as derived from the approximate camera pixel scale used, 0.027"/pixel, and assuming a 0 degree rotator angle. We estimate that absolute uncertainties in the astrometric precision can be as large as 0.1". The J2000.0 position of Sagittarius A* is (17:45:40.0409, -29:00:28.118) according to Reid & Brunthaler (2004ApJ...616..872R). The uncertainties of the H, Ks , and L'-magnitudes in the table are statistical uncertainties. The one sigma uncertainties of the zero points are not included. They are 0.06mag for the H and Ks filters and 0.15mag for the L'-filter. A value of 0.00 in either of the H, Ks, or L'-fields means that the star was not detected with the corresponding filter.
The FITS file AKs_fg6.fit is the extinction map for the Ks-band that is shown in the upper left panel of Fig. 6 of the original paper. The value of each pixel in the FITS image corresponds to the extinction in the Ks-band in magnitudes at the corresponding position. The effective wavelength is 2.168 micrometer. North is up and east is to the left. The pixel scale is 0.027" and Sagittarius A* is located at pixel position (808,611). These values will provide astrometry with an accuracy of roughly 0.1", a factor about 10 better than the actual resolution of the extinction map, which is about 1".
(2 data files).

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