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Table 5

Combined classification of the good subsample sources.

COMBO-17 Chandra a.c.

Galaxies 862 91a 814
AGN 11 61b 11
Intermediate 50
Stars (and WDsc) 118 6d 119
Uncertain/unclassified 40 37
Total 1031 158 1031



two sources with dubious classification – “Galaxy (Uncl!)” – in the COMBO-17 survey.


50 sources classified as galaxies in the COMBO-17 survey.


White dwarfs (WDs) are classified separately only in the COMBO-17 survey.


One absent source among the COMBO-17 counterparts. The last column (a.c.) refers to the classification adopted in producing Figs. 35, 811 and contained in Col. 96 of the catalogue (see Sect. 3.3). Intermediate sources are the objects classified as AGN in the Chandra 4 Ms source catalogue and as galaxies in the COMBO-17 survey. Objects with dubious classifications – “Galaxy (Uncl!)”, “Galaxy (Star?)”, “QSO (Gal?)”, “Strange Object” – or absent in the COMBO-17 survey are indicated as uncertain.

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