theSkyNet POGS - the PS1 Optical Galaxy Survey
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I am a member of \"The Knights Who Say NI!\" I joined this Project because I am a Credit Ho! KWSN shall Rule the World....... Resistance...

News

More Galaxies
Sorry folks - David is having a few problems with the new galaxies - we hope to have things flowing shortly. But he is doing the following to the new data which is pretty tricky:

    (a) adaptive smoothing across all bands, after initial resolution match (this next run will be Pan-STARRS & SDSS, then we'll add GALAX, WISE, Spitzer & Herschel)
    (b) foreground stellar masking
    (c) segmentation map defining the main galaxy in each input, derived from a "white-light" image
    (d) integrated SED placed artificially into pixel (1,1).


Also the new Web Site Security Certificate has been deployed.

The Android code is about to be loaded onto the test server so we hope to release it asap. 11 Mar 2015, 1:29:27 UTC · Comment


Run out of Galaxies
We'll run out of Galaxies over the weekend.

Next week we'll:


  • load new data using Pan-STARRS and SDSS
  • start using the stellar libraries with the 2003 version of the Bruzual & Charlot models
  • release the new Android code
  • switch to the latest wrapper code

6 Mar 2015, 5:10:52 UTC · Comment


Android Lollipop
POGS can’t currently support Lollipop, but will be able to soon, we’ll (Alex) provide updates as soon as possible. 12 Feb 2015, 4:19:19 UTC · Comment


Australia Day
Happy Australia Day 26 Jan 2015, 1:01:54 UTC · Comment


theSkyNet POGS project Update
Hi All,

We’re planning an upgrade for POGS in the next few months that will see us add more calculations to the suite already conducted on each galaxy image, add more data types (such as higher resolution images from the WISE telescope, http://www.nasa.gov/mission_pages/WISE/main/, which collects infrared light) and much, much more.

There are some big changes, and some smaller ones, included in the upgrade. We’ve given a short summary of everything below, but if you’d like any more specific detail or have questions then please let us know.

As part of the upgrades we intend to run some simulated galaxies through the upgraded POGS code as a check on the accuracy of our the data processing. These 'fake' galaxy images are created by supercomputers as part of a large cosmological simulation http://www.illustris-project.org. Once the simulated galaxies are processed by the upgraded POGS ‘spectral energy distribution’ fit code, we can compare the results to the known properties used when creating the fake (but highly realistic) galaxies to confirm the upgraded code works as expected and is producing accurate science results for the astronomers.

We’re also upgrading the data retrieval pipeline, continuing to get enhanced infrared images from the WISE telescope for all galaxies that have already been processed, as well as some more galaxy data from other new sources. This new data will broaden our results on the galaxies that have been already processed - helping the astronomers to see more of the bigger picture, so to speak.

Kevin and the team will also upgrade the input data processing pipeline as well. This will include improving the pre-processing of input images to enhance their usefulness in especially faint regions (like the outer parts of a galaxy). A technique called adaptive smoothing will be used to achieve this result without blurring of bright regions. They will also develop ‘parameter prior cubes’, sets of position-dependent bracketing parameter values that should be used in SED fitting calculations. You can think of them as educated guesses for each parameter. This will stop us calculating every possible combination of parameters on every galaxy — saving time and resources. This also means we will be changing the credit system from the current points-per-pixel based model, as with ‘priors’ all pixels are no longer equal. We will let you know when the credit change will occur and will do our best to make sure it’s equitable and results in approximately the same amount of credit you currently earn.

We will also be upgrading the output processing to produce better results images. This will include things like stellar masking (from catalogs, or directly from the images) to remove foreground stars from the calculations, and we also start using a code called ‘galfit’ (http://users.obs.carnegiescience.edu/peng/work/galfit/galfit.html) to give a mass surface density of the galaxies (a new calculation) and also try another code called ‘CIGALE’ (http://cigale.lam.fr/) and others on the data.

All of this comes together to mean better science output from POGS - something we’re really keen on and we hope you are too!

--TheSkyNet Team
8 Dec 2014, 2:47:51 UTC · Comment


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