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- W1780009261 abstract "HQM is an optical broad-band photometric monitoring program carried out since Sept. 1988. Our main intention is to search for indications of microlensing in a sample of ∼100 selected quasars; however, we also want to study the intrinsic variability. We use a CCD camera equipped to the MPIA 1.2 m telescope. Fully automatic photometric reduction relative to stars in the frame is done within a few minutes after each exposure, thus interesting brightness changes can be followed in detail. The typical photometric error is 1-2% for a 17.5 mag quasar, making HQM the most accurate long-term quasar monitoring program yet carried out. The main results of HQM which we discuss here are: (1) Concerning variability, quasars form two, clearly distinct classes, optically violent variables (OVVs) and non-OVVs" @default.
- W1780009261 created "2016-06-24" @default.
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- W1780009261 date "1994-04-01" @default.
- W1780009261 modified "2023-09-27" @default.
- W1780009261 title "The Hamburg Quasar Monitoring program (HGM) at Calar Alto. I: Low amplitude variability in quasars" @default.
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