... nursery

Appendix is only available in electronic form at http://www.aanda.org

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...

Present address: Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS 42, Cambridge, MA 02138, USA.

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... PIMMS

PIMMS is the Portable, Interactive Multi-Mission Simulator provided by the HEASARC Online Service at http://heasarc.gsfc.nasa.gov/Tools/w3pimms.html

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... package

See http://www.astro.psu.edu/xray/docs/TARA/code/

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...%

See http://cxc.harvard.edu/cal/

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... Getman

http://www.astro.psu.edu/users/gkosta/AE/accessory_tools.htm

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...documentation

http://www.astro.psu.edu/xray/docs/TARA/ae_users_guide.html

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... counts

Based on the X-ray source counts presented by Brandt et al. (2001) there should be $\sim$60-70 extragalactic sources exceeding the flux limit of our data. The number of actually detectable extragalactic sources must be somewhat smaller due to the extinction of the dark cloud, especially in the central part of our field of view.

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... objects

We note that the Chandra source 190205.84-365444.2 has neither optical nor infrared counterparts, but is located near a bow shock seen in the Spitzer images. However, a relation between the X-ray emission and the bow shock seems very unlikely. First, the positional offset of 8'' is clearly much larger than the astrometric accuracy, and the offset is not along the flow direction, i.e., cannot be explained by the non-simultaneous nature of the X-ray and infrared images. Second, the distribution of energies of the 21 detected source counts is quite hard (no photons with energy $\leq$1 keV, 4 photons in the 1-2 keV, and 17 photons in the 2-8 keV range), in strong contrast to the very soft X-ray emission expected from jet shocks and observed in some cases (e.g. Grosso et al. 2006; Pravdo et al. 2004). We therefore believe that the X-ray emission comes from a background object and is not related to the bow shock.

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