Changing State QSO's: a clue to understand their physics
62-509 Tapio Pursimo
Summary:
Extreme photometric variations in
AGN's are often accompagnied by large spectral changes whose origin
is not yet understood. This includes Changing Look or Changing State Quasars
(changes in the BLR), candidate Tidal Disruption Events, Erratic Blazar
Variability, etc..
Spectral analysis of more cases with large
photometric changes,
is necessary to disantangle the role of
reddening variations, changes in the structure of the BLR or
variations in the accretion rate, among others.
The Gaia Alerts provide an all-sky photometric transient survey,
based on the repeated, high-precision measurements made by the Gaia satellite.
We propose to do
systematic spectroscopy of selected new cases coming up, at a rate of ten
per semester, over 2 years, to significantly increase the available
sample and detail the timescales and physical changes occuring in
those extreme objects. These variable sources likely include
heterogeneous classes of object, and hence a long term programme
is necessary in order to obtain meaningful statistics.
Calibrations
Internal flats, arcs and bias frames from alfosc-calibs
and "standard" twilight flats for photometry
Observations
The PI will send the target and observing information when
this ToO is triggered.
Available scripts
Go to the directory
cd ~/scripts/62-509
execute the requested scripts.
P62 tracking
P63 tracking
P64 tracking
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