Difference: TeleConf28012016 (1 vs. 2)
Revision 22016-01-28 - SemeliPapadogiannakis
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| > > | -Flatfield specification: Jacob: Have had a lot of discussions in Berlin but no clear conclusions. Do something similar to DES? Unclear what the ZTF collaboration is planning. The physical screen if modelled like DES should be fine, the question is about the LED and how they are supposed to be positioned, wavelengths, how many etc. The current standard is to do star flats(dithered observations of stars) to calculate the pixel efficiency, this allows a low quality flatfield. Then you need another one to fill the gaps of the bins. | |||||||
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| > > | The way to proceed is for one of us to join their discussions to determine about the number of LEDs, and matching the kind of SED we are planning to observe. Due to the dome being small there are some additional complications that should be discussed. Michael:Grand plan seems to be screen flats like in Paris. Unique LED for different filters to avoid paralell sideline outside the filter. Can we mount the flat field screen several months before to perform tests? Ariel: How good do the flatfields have to be? We have to define how many LEDs are good etc. A:Night flats are typically made, why was this not good enough? #1 There are not strong emission lines #2 Huge field of view makes it difficult to know that they will average out. #3 Lower limit comes from flat field, 5 mmag which becomes a systematic offset. Let's keep working on this. Need one person to be closer to Thomas K., good if anyone in Berlin to do this. Also need to start measuring things from data that is already in the IPAC database. Could ask for a star field to be observed and dithered, the summer is a good time to do this since we are already observing the galactic plane. -Status of survey simulations and implications for bulk flow/sheer-Ulrich Feindt Slides are on the twiki. Questions: Jacob: Assume that northern SN, is it not more realistic to have a more limiting RA, what happens? Uli: Direction resolution that goes down, could also add a bias. Ariel: Is all sky the best? Uli: Around Shapley would be good but difficult with ZTF. Software developments: Michael: Implemented instrument control and calibration software part. Priorities: Ariel: We need to understand how good the calibration of how things are now. Next time we should discuss how much better we need to get. We will share the data on the 1 degree field around M82. Plan for Ia's as cosmological probes meeting in Berlin, April 14-15. Next meeting we will discuss priorities in more detail. | |||||||
Revision 12016-01-28 - UlrichFeindt
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