Table 1: Proper motions of thin filaments.

Feature		 $\Delta\alpha$a $\Delta\delta$a ${\rm Size}~ (\Delta x \times \Delta y)$ vb $\Delta v$ $\phi$c $v_{\rm esc}$
  (arcsec) (arcsec) (arcsec $\times $ arcsec) (km s-1) (km s-1) ($^\circ $) (km s-1)
NE1 4.76 3.42 $0.32\times0.46$ -29 16 90 368
NE3 2.62 -0.09 $0.38\times0.41$ 167 25 140 550
SW3 -6.08 -0.77 $0.35\times0.35$ -229 19 270 360
SW4 -5.07 1.76 $0.43\times0.38$ -92 16 305 404
SW5a -4.20 -2.31 $0.35\times0.11$ -165 15 270 407
SW5b -4.13 -2.75 $0.16\times0.24$ -123 22 240 400
NE4 (RA) 0.50 -1.63 $2.51\times1.97$ -386 76   682
NE4 (Dec)       -280 55    
NE4 (along)       -436 103 240  
NE4 (perp.)       194 11 150  
SW7 (RA) -3.07 -5.10 $0.73\times1.22$ -186 17   365
SW7 (Dec)       -80 21    
X1 (RA) 3.22 3.40 $0.30\times0.38$ 113 16   412
X1 (Dec)       -78 21    
X7 (RA) -0.56 -0.55 $0.54\times0.41$ -71 17   1006
X7 (Dec)       458 21    
X3 (RA) -2.45 -2.37 $0.46\times0.43$ -78 18   483
X3 (Dec)       135 20    
a Relative to SgrA*; position of the center of the box; b velocities of all NE and SW features, except that of SW7 and NE4, are in a direction approximately perpendicular to the feature. Other proper motions are given both in RA and Dec direction. In case of NE4 we additionally give the velocity along the feature and perpendicular to it. The positive sign in the velocity refers to the eastward motion in RA and northward in Dec. For the perpendicular component the positive sign marks the predominant eastward motion. The negative sign for the motion of the NE4 along the filament marks the predominant southward component; c the position angle of the velocity vector for the features with a proper motion measured in the direction perpendicular to the feature. The angle is measured east of north.

Source LaTeX | All tables | In the text