Star Galaxy Separation Resource Needs

Number/name of Requirement or Goal:

SG-separation 1 - 6

DECam observations

  • Field(s) to observe:
    both southern VVDS fields. If time permits: galaxy cluster fields with HST data (e.g. MACS0329.7-0212, A383)
  • Number, duration of exposures per filter:
    Full-depth in all bands used for S/G, i.e. at least in i
  • Dithering / tiling pattern:
    as in main survey
  • Sky conditions needed (seeing, photometric, moon phase, etc:):
    as typical for main survey
  • Other timing constraints:

Data processing needs

Which of the following products would you need to conduct the test:

  • Single-exposure object catalogs? only for SG-1, several sq. degrees
    • with astrometric solution accurate to: not needed
    • and photometric zeropoint accurate to: not needed
    • Only need bright stars, or also want galaxy magnitudes? MAG_AUTO, MAG_ERR and CLASS_STAR for all objects
  • Catalogs from coadds? for SG-2 to SG-6
    • with photometric zeropoint (and/or colors) accurate to: depends on requirements S/G separation code
  • Other: Output of S/G separation code

Telescope or other engineering data

External data sets

for SG-2 to SG-4 and SG-6: spectroscopic S/G classification of both southern VVDS fields
for SG-5: well studied galaxy cluster fields, e.g. from CLASH

Codes and scripts for analysing the test data

all off-the-shelf: SExtractor for SG-1, catalog matching tools (python or topcat) for the rest.


Are there real-time decisions to be made during the observations? no

How quickly can / must the data be available and analysed? not urgent (it's a goal, not a requirement)

Who will do it, and where? Anybody, anywhere (but Peter and Nacho volunteer)

Other important resources or things to note