Kirk,
We cannot assume that there is no compelling science in a scenario
that has yet to be investigated very thoroughly and for which LSST
can (and should) provide definitive all-sky data (i.e., to find
long-term variable phenomena in very faint objects -->
e.g., brown dwarfs, L/T dwarfs, rotating Oort cloud objects,
stochastic accretion of infalling gas on the most distant
massive black holes = baby QSO's ... and who knows what?).
So, I do agree that this is not a strong driver, but let us not
exclude the possibility.
I do agree that we should not exclude the possibility for
doing things that may not excite us at the moment. In this
case, I said that it wasn't a strong driver because we can
do the same thing at the single-epoch catalog level. It is
true that by coadding ~10 single exposures one would go
~1 mag deeper, but it wouldn't be a completely new territory.
We would probably have a pretty good idea what to expect from
the latter approach based on the results from the former.
If it happens to be exceedingly interesting, than we can
certainly move in that direction. By its nature, this is not
a time-sensitive project (on scales of ~yrs), and since we
keep all the images, nothing would be lost.
Cheers,
Zeljko
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