Changes between Version 4 and Version 5 of Questions_Durham_MDS_Testing
- Timestamp:
- Jul 23, 2009, 11:39:05 PM (17 years ago)
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Questions_Durham_MDS_Testing
v4 v5 1 1 A set of questions that have arisen from the analysis of the MDS 07 and 08 images at Durham. 2 3 Image examples related to the questions raised here can be found at [http://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/wiki/Durham_MDS_Testing,this wiki page] 4 2 5 These questions are preliminary and will be updated as we learn more. 3 6 … … 15 18 that is done to each warp prior to stacking, but looks far worse than those with experience of stacking expected. 16 19 17 5) In good seeing (~1.2 arc sec PSF) warps the images of stars are clearly not round. Some are triangular (!) others look trailed 18 (but not coherent across whole frame and so not trailing). Is this poor focus? What are the prospects for improvement? 20 5) In good seeing (~1.2 arc sec PSF) warps the images of stars are clearly not round. Some are triangular (!) others look trailed (but not coherent across whole frame and so not trailing). Is this poor focus, or an issue with read-out? What are the prospects for improvement? 19 21 20 6) Many reasonably bright galaxies (17 mag) have cross shaped masks applied to their centres. It looks like they've been flagged 21 as bright stars and an erroneous attempt has been made to mask out diffraction spikes. 22 6) Many reasonably bright (but unlikely to be saturated) galaxies (17 mag) have cross shaped masks applied to their centres. It looks like they've been flagged as bright stars and an erroneous attempt has been made to mask out diffraction spikes. 22 23 23 7) The z-band images appear striped, which we think is an artificat of the correlated read noise that Ken mentioned. Is that the case 24 and if so why is it apparent in long exposure MDS frames, especially in z where the sky brightness is high? 24 7) At least some of the z-band warped images appear striped, which we think is an artifact of the correlated read noise that Ken mentioned. Is that the case and if so why is it apparent in long exposure MDS frames, especially in z where the sky brightness is high?
