=== Notes on discussion ===

Vadim Burwitz (MPE)/ Jan Robrade (Hamburg) - Stellar Working Group

  * Even shallow surveys are adequate, because these tend to be bright
  * Need coverage over the galactic plane
  * Typically one direction-- look at optical star catalog and find the eROSITA counterpart
  * a challenge is stars tend to have companions, and these cannot be easily separated in the X-ray
  * Nearby- so proper motions must be available for the optical catalogs...
  * Stellar scientists will generate new lists and need to upload those into Frank's tool to allow for cross-correlations with other catalogs.


Arne Rau (MPE) and Axel Schwope (AIP) - compact objects working group

  * Type 1 sources:  known X-ray emitters (famous but a minority of sources)
  * Type 2 sources:  standard multi-wavelength catalogs... position, flux, morphology and variability information needed
  * Most are galactic sources  (also LMC and SMC), but not true for all....
  * Variability - on different timescales-- typically shorter timescales than AGN
  * Lack of a counterpart is also important information
  * Proper motions would be key way to separate CV and AGN-- otherwise only Spectra can do this
      o Galaxy extent also useful for AGN...  (but not QSO's)
  * Showed the Catalina Real Time Survey-- nice variability survey

Werner Becker, Tom - SNe Remnants


Mara - AGN

  * could we test for variability on PS1 and DES?
  * can we work together to combine data from different bands? (i, UKIDS/WISE/DES?)


Discussion items:

  * specific questions:
      * We need some kind of footprint service-- using Mangle???
      * Start with crude coverage maps... ultimately will likely need detailed coverage maps.
      * Healpix has been thought of, but it's not very efficient...
      * Polygons seem to be better for this- well accepted.
      * Database server- bringing the Johns Hopkins here to start with quickly.  It would be at the Rechenzentrum.
      * New person would be hired at MPE to handle this work.
  * A shared region of the sky.... Stripe82 is an option.  2 deg^2 would be a good start.  PS1+DES+SDSS....
  * Discussion of links to the images from particular surveys for...
      * need to store the coadds and offer cutouts....
      * need an interactive tool to create cutouts...   this serves most people.
  * Discussion of X-ray image cutouts... should it be in image space or
    should it be the photon lists.
      * Tom doing this for spectra and light curves...
      * Would work for lists of sources... is good for stacking...
      * X-ray contour line overlays for survey cutouts 
  * Further discussion of database issues....
      * looking for an additional person supported by MPE...
      * will try to get Marion Cadolle Bel involved in this, starting this fall
      * RZG is sharing DBA half and half with MPA...
  * To do list:  by October...
      * Joe:  will track down PS1 and DES photometry over stripe 82... get back to Mara about this.
      * Hermann, Gerard, Jaiwon... - will look into database issues
        * will interact wit RZG re. hosting JHU SkyQuery catalog DB (cortesy Alex Szalay, see GL's/HB's presentations)
        * will look into attaching Millenium/TAP services to SkyQuery DB 
        * longterm (given availability of suitable developer/maintainer): port functionality of Frank's SMC DB system to SkyQuery/Millenium/TAP, tailor for eROSITA... 
  * Will post talks on the wiki... (for now)
      * will try to circulate notes, too...
  * Discussion of October meeting --
      * Schedule for the next consortium meeting....
          + 2.5 days of meeting...