Star formation history of Canis Major OB1 - II. A bimodal X-ray population revealed by XMM-Newton

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Table 6

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

	XMM^a	ROSAT/XMM^b	ROSAT_add^c	ROSAT_Total^d	XMM+ROSAT_add^e	Side of cloud

Age						East^f	West^g

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: A_V > 2); and

^(g)

79 (outside the cloud: A_V < 2).

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