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gaia data release 3 documentation

9.5 Post-processing and flagging

9.5.2 Quasars

All processed quasars are treated as if their host galaxy is measurable by Gaia, which is not the case. The post-processing aimed at identifying the objects with convincing host galaxy parameters and at eliminating sources for which the fitting was considered not robust or eliminating some problematic parameters. The post-processing also aimed at giving some indications about the status of the objects through two flags: host_galaxy_detected (True/False) and host_galaxy_flag (1-6). The first one indicates if Gaia was able to detect a host galaxy around the source and the second one gives information about the specificity and the quality of the fitting.