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Table 6

Number of X-ray sources as a function of age and mass ranges and their spatial distribution.

XMMa ROSAT/XMMb ROSAT_addc ROSAT_Totald XMM+ROSAT_adde Side of cloud

Age Eastf Westg

0.3–5 Myr 93 (41%) 20 (53%) 12 (48%) 32 (51%) 105 81 (47%) 24 (30%)
5–10 Myr 42 (19%) 5 (13%) 5 (20%) 10 (16%) 47 32 (19%) 15 (19%)
10–55 Myr 90 (40%) 13 (34%) 8 (32%) 21 (33%) 98 58 (34%) 40 (51%)

Mass

0.5–1 M 93 (41%) 14 (37%) 1 (4%) 15 (24%) 94 79 (46%) 15 (19%)
1–2 M 89 (40%) 17 (45%) 14 (56%) 31 (49%) 103 58 (34%) 45 (57%)
2–9 M 43 (19%) 7 (18%) 10 (40%) 17 (27%) 53 34 (20%) 19 (24%)

Notes. Percents computed as a function of total number of sources:

(a)

225 (XMM-Newton);

(b)

38 XMM-Newton best sample detected by ROSAT;

(c)

additional 25 ROSAT sources;

(d)

63 (all ROSAT);

(e)

250 (XMM+ROSAT);

(f)

171 (on dense regions: AV > 2); and

(g)

79 (outside the cloud: AV < 2).

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