The nuclear star cluster of the Milky Way: proper motions and mass

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Volume 502 / No 1 (July IV 2009)

A&A, 502 1 (2009) 91-111

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Table 2:

Measured proper motions, in the infrared frame, of the maser stars used for astrometric alignment.
Name	RA [arcsec]	Dec [arcsec]	$v_{\rm RA}$ [mas yr^-1]	$v_{\rm Dec}$ [mas yr^-1]	$\Delta_{\rm radio,IR}$ $v_{\rm RA}$ [mas yr^-1]	$\Delta_{\rm radio,IR}$ $v_{\rm Dec}$ [mas yr^-1]
IRS 15NE	$1.226\pm0.015$	$11.327\pm0.024$	$-1.51\pm0.15$	$-5.81\pm0.15$	$-0.46\pm0.17$	$0.13\pm0.19$
IRS 7	$0.046\pm0.010$	$5.569\pm0.016$	$-0.05\pm0.23$	$-4.59\pm0.23$	$-0.53\pm0.55$	$1.07\pm0.59$
IRS 17	$13.143\pm0.019$	$5.566\pm0.030$	$-1.70\pm0.12$	$-1.04\pm0.12$	$0.09\pm1.09$	$0.29\pm1.23$
IRS 10EE	$7.688\pm0.012$	$4.220\pm0.020$	$-0.40\pm0.18$	$-1.55\pm0.18$	$0.44\pm0.19$	$-0.55\pm0.19$
IRS 28	$10.477\pm0.016$	$-5.825\pm0.026$	$1.62\pm0.23$	$-4.71\pm0.23$	$0.38\pm0.44$	$-0.57\pm0.48$
IRS 9	$5.672\pm0.013$	$-6.335\pm0.021$	$3.30\pm0.25$	$3.03\pm0.25$	$-0.24\pm0.26$	$-0.92\pm0.31$
IRS 12N	$-3.250\pm0.012$	$-6.876\pm0.019$	$-1.62\pm0.22$	$-2.78\pm0.22$	$0.56\pm0.24$	$0.07\pm0.28$

Positions are given for 2004.44 as offsets from Sgr A*, positive toward the north and east. Proper motions are given in milli-arcseconds per year, positive toward north and east. The last two columns list the differences between the radio (Reid et al. 2007) and IR proper motions.

Source LaTeX | All tables | In the text

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