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Table 4

Limits in X-ray observations.

Flux a log (LX)b d c Exp. time (d) Inst.(e)
10-15 erg s1 cm-2 pc ks

Field EXMM 2.5 29.48 1000 32 XMM
Field CXMM 2.2 29.43 1000 30 XMM
Field SXMM 2.4 29.46 1000 28 XMM
Field WXMM 1.6 29.27 1000 28 XMM

Field 1ROSAT 3.6 29.78 1000 20 ROSAT
Field 2ROSAT 8.36 30 1000 5 ROSAT

ONC 0.042 27.01 450 838 Chandra
TMC 1.70 27.60 140 31–131 XMM
Collinder 69 5.22 29 400 28–37 XMM

Notes.

(a)

Flux limit of X-rays observations;

(b)

luminosity limit;

(c)

distance;

(d)

exposure time;

(e)

instrument used for observations.

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