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Using Milky Way data of the new Effelsberg-Bonn HI Survey (EBHIS) and theGalactic All-Sky Survey (GASS), we present a revised picture of thehigh-velocity cloud (HVC) complex Galactic Center Negative (GCN). Owing to thehigher angular resolution of these surveys compared to previous studies (e.g.,the Leiden Dwingeloo Survey), we resolve Complex GCN into lots of individualtiny clumps, that mostly have relatively broad line widths of more than 15km/s. We do not detect a diffuse extended counterpart, which is unusual for anHVC complex. In total 243 clumps were identified and parameterized which allowsus to statistically analyze the data. Cold-line components (i.e., w < 7.5 km/s)are found in about 5% only of the identified cloudlets. Our analysis revealsthat Complex GCN is likely built up of several subpopulations that do not sharea common origin. Furthermore, Complex GCN might be a prime example for warm-gasaccretion onto the Milky Way, where neutral HI clouds are not stable againstinteraction with the Milky Way gas halo and become ionized prior to accretion.

The high-velocity cloud complex Galactic Center Negative as seen by EBHIS and GASS. I. Cloud catalog and global properties