The evolution of velocity dispersion in the Sco-Cen OB association

Open Access

Table 2

Linear regression results for the three PVDs, as shown in Fig. 6.

	PVD	Slope (a)	Intercept (b)	Time (a⁻¹)
		[km s⁻¹ pc⁻¹]	[km s⁻¹]	[Myr]
using 32 clusters	XU	${0.057}_{- 0.007}^{+ 0.006}$ $Mathematical equation: $0.057^{+0.006}_{-0.007}$$	$- {1.24}_{- 0.51}^{+ 0.73}$ $Mathematical equation: $-1.24^{+0.73}_{-0.51}$$	${17.2}_{- 1.9}^{+ 2.4}$ $Mathematical equation: $17.2^{+2.4}_{-1.9}$$
	YV	${0.062}_{- 0.006}^{+ 0.006}$ $Mathematical equation: $0.062^{+0.006}_{-0.006}$$	$- {2.97}_{- 0.45}^{+ 0.46}$ $Mathematical equation: $-2.97^{+0.46}_{-0.45}$$	${15.9}_{- 1.5}^{+ 1.9}$ $Mathematical equation: $15.9^{+1.9}_{-1.5}$$
	ZW	${0.037}_{- 0.010}^{+ 0.009}$ $Mathematical equation: $0.037^{+0.009}_{-0.010}$$	$- {0.26}_{- 0.32}^{+ 0.35}$ $Mathematical equation: $-0.26^{+0.35}_{-0.32}$$	${26.6}_{- 5.5}^{+ 9.3}$ $Mathematical equation: $26.6^{+9.3}_{-5.5}$$

using 25 clusters	XU	${0.065}_{- 0.005}^{+ 0.004}$ $Mathematical equation: $0.065^{+0.004}_{-0.005}$$	$- {1.76}_{- 0.35}^{+ 0.49}$ $Mathematical equation: $-1.76^{+0.49}_{-0.35}$$	${15.1}_{- 1.0}^{+ 1.1}$ $Mathematical equation: $15.1^{+1.1}_{-1.0}$$
	YV	${0.055}_{- 0.007}^{+ 0.006}$ $Mathematical equation: $0.055^{+0.006}_{-0.007}$$	$- {3.63}_{- 0.50}^{+ 0.46}$ $Mathematical equation: $-3.63^{+0.46}_{-0.50}$$	${17.8}_{- 1.9}^{+ 2.4}$ $Mathematical equation: $17.8^{+2.4}_{-1.9}$$
	ZW	${0.053}_{- 0.008}^{+ 0.009}$ $Mathematical equation: $0.053^{+0.009}_{-0.008}$$	$- {0.00}_{- 0.30}^{+ 0.32}$ $Mathematical equation: $-0.00^{+0.32}_{-0.30}$$	${18.6}_{- 2.7}^{+ 3.7}$ $Mathematical equation: $18.6^{+3.7}_{-2.7}$$

Notes. Top three rows: results obtained by using all 32 clusters. Bottom three rows: results obtained by using only 25 clusters, after removing seven clusters with peculiar motions.

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