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LSSTDESC / DC2-production

Configuration, production, validation specifications and tools for the DC2 Data Set.
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What model of AGN variability will we use for DC2? #55

Closed jchiang87 closed 5 years ago

jchiang87 commented 6 years ago

In this comment, Eve notes that the galaxy catalogs produced by the CosmoSims code have black hole mass and accretion rate columns. In the subsequent comment, Scott says it will take some work to incorporate those parameters into a model of variability for the AGNs that CatSim would serve up. However, table 2 of the DC2 planning document (read-only) refers to a "damped random walk model" which must be something else.

@drphilmarshall Thoughts on what we should do for (presumably non-lensed) AGNs?

danielsf commented 5 years ago

I gave the paragraph in the DC2 paper dealing with this a once-over. It looks sufficient. @jiwoncpark has been doing some validation on the AGN population in run 2.*. Hopefully, we will turn that into a DESC note or paper.

janewman-pitt-edu commented 5 years ago

There's a mention above of considering whether the accretion is efficient vs. inefficient. How is that handled in the output catalogs / mapping to observables? For quiescent galaxies, something like 90%-95% of the time, when the accretion rate is low there should be no detectable optical flux from the AGN (i.e. you can't detect emission lines at all, which will be much easier to detect than continuum).

danielsf commented 5 years ago

I don't think anything ever came of that statement (efficient vs. inefficient accretion).

katrinheitmann commented 5 years ago

Could somebody (@evevkovacs maybe you can help with this?) put a final summary in here with maybe links to the description of the new AGN approach that we will use in the DDF? We also need to update the DC2 paper draft. And then close this issue? Thanks!

evevkovacs commented 5 years ago

The AGN model that will be implemented for DDF will be to use the AGN model already in place for Run 2.1i (MacLeod et al.) with the addition of the duty-cycle model model developed by Andrew Hearin. The code has been incorporated into pipeline for producing the AGN. Results are summarized in the following presentations: DC2 DDF Simulations (see AGN section) , AGN Test Update