... NRAO

National Radio Astronomy Observatory is a facility of National Science Foundation operated under a cooperative agreement by Associated Universities, Inc.

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... telescope

The 100-m telescope at Effelsberg is operated by the Max-Planck-Institut für Radioastronomie (MPIfR) on behalf of the Max-Planck-Gesellschaft.

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... XMM-Newton

XMM-Newton is an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA (Jansen et al. 2001).

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... AIPS

Astronomical Imaging Processing System of the National Radio Astronomy Observatory.

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