Discussion: 1st day, lead by Morokuma

# Check information I enclosed with (). Thoses are uncertain and need to be confimred:


1: requirements in commissioning for “science”?

Strauss: Miyazaki san is missing today. What should we do? what can we really do under restrictions for commissioning runs? Science exposure should be strictly restricted, according to Miyazaki san.
Imanishi: "science" observations will be charged, and will be deduced later.
Akiyama: For FMOS, we did deep observations for measuring real limiting sensibility. We may be able to do the similar thing with HSC.
Strauss: we will share the interesting image quality parameters among all HSC survey team, such as image size, depth, etc. I mean, we need to consider this kind of thing under wider groups including galaxy people, for example. Perhaps Not good to ask some specific science data.
Furusawa: For data reduction point of view, I have no comments since software activity is a part of entire HSC project.
Strauss: Any preferred specific interesting regions for AGN group? We may request it for other image quality check, for example.
Nagao: Better to visit a field with QSOs with known spectroscopic information, like Cosmos. HSC test shots maybe important to test our techniques for AGN selection, AGN photo-z check, etc.
Tanaka: Cosmos is not always an only option due to, for example, bad RA (season), depending on commissioning run dates.
XXX: we will have no more specific requirement for verifying something for AGN. (it was not clear to me, sorry)


2: Discussion on software/calibration

Furusawa: we always need help.
Strauss: more request on variability information? what is the real difficulty within the pipeline for variable sources? Developing image subtraction techniques for variable source?
Strauss: way of photometry for AGN with underlying extended galaxies? No experience with SDSS so far. With HSC, we should be able to do better job due to better imaging.
XXX: some new paper papered very recently on SDSS for this stuff.


3: Combining external catalogs. How?:

Morokuma: how about forced photometry issue with NIR and other bands?
Seb: Management/arraignment etc. are issues. I mean, this is not just about technical difficulties. I have no good sense how we should proceed.
Srauss: We can start discussion with Seb in near future. (Seb has a plan to visit Princeton for data reduction related stuffs).

Akiyama: for highest-z QSO search sub-group, what is your plan for analyses? How to add NIR photometry? Any particular plan in your mind?
XXX (Japanese guy): Color selection is to find candidates. It can be made easily once we have a catalog. For real science, we do need spectroscopy.
Kashik: For fare photometry, we want to work on the NIR data by ourselves so that we can control/understand any systematic, etc.


4: photo-z for AGN candidates: Our requirements and future development direction?

Nagao: photo-z helps even with less accuracy. Much better information than just by saying what kind of drop-out they are. Especially at z>3 (need to be confirmd).
Tanaka: Need template for the redshift range for the photo-z to work. Need more specific requirement for accuracy, etc.
Nagao: xxx (YO missed, sorry)
Akiyama: For clustering analyses, do not need very high redshift. For QSO-galaxy correlation, we need spectroscopy redshift. So requirement for z accuracy depends on types of science and range of redshift .
Seb: z>3 (need confirmation), photo-z is useless without U or NIR.
Tanaka: please keep informing us (photo-z WS) any requirements.
Morokoma: do we really need photo-z for very high-z sources in addition to color dropout information?
Nagao: for QQ auto-correlation, yes.
Akiyama: It does help. dz=0.2 at z=4 is preferable for QQ auto correlation. Correlation signal is expected theoretically, and HSC data should be able to constrain it. Of course, PFS spec-z info is much better.
Morokuma: what is the most important parameters for high-z QSO analyses?
Strauss: outliers rate should be small for clustering signal.
Morokuma: We need more quantitative information, e.g., on accuracy?
Someone: as small as possible!