Validation of Synthetic Galaxy Catalogs
Joe Hollowed
Young Scientists Symposium Series
Argonne National Laboratory
November 14 2017
LSST
Large Synoptic Survey Telescope
SDSS Legacy
Sloan Digital Sky Survey
– 5 years (2000-2005)
– ~2.3×10⁸ objects
– ~8,400 deg² coverage
– 22.2 r-band magnitude limit
– 60.5 TB data volume
– 10 years (2022-2032)
– ~37.0×10⁹ objects
– ~20,000 deg² coverage
– 27.6 r-band magnitude limit
– 30 PB data volume
Next Generation Sky Surveys
11/14/17 YSSS 2017 1
LSST
Large Synoptic Survey Telescope
SDSS Legacy
Sloan Digital Sky Survey
– 5 years (2000-2005)
– ~2.3×10⁸ objects
– ~8,400 deg² coverage
– 22.2 r-band magnitude limit
– 60.5 TB data volume
– 10 years (2022-2032)
– ~37.0×10⁹ objects
– ~20,000 deg² coverage
– 27.6 r-band magnitude limit
– 30 PB data volume
Next Generation Sky Surveys
How should the community prepare for upcoming petascale data releases in the early 2020's?
11/14/17 YSSS 2017 1
QContinuum Simulation (1/16384 full sim)
Argonne National Laboratory
N-body simulations
Creating Synthetic Skies: ProtoDC2
11/14/17 YSSS 2017 2
QContinuum Simulation (1/16384 full sim)
Argonne National Laboratory
N-body simulations
Galaxy placement & tracking
Core Tracking
Creating Synthetic Skies: ProtoDC2
11/14/17 YSSS 2017 2
QContinuum Simulation (1/16384 full sim)
Argonne National Laboratory
Creating Synthetic Skies: ProtoDC2
N-body simulations
Galaxy placement & tracking
Galaxy placement & tracking
Galacticus, ray tracing, GalSim
Core Tracking
11/14/17 YSSS 2017 2
Analysis
Overview
Analysis
Validation
or
Modification
11/14/17 YSSS 2017 3
Analysis
Overview
Analysis
Validation
or
Modification
11/14/17 YSSS 2017 3
Analysis
Overview
Analysis
Validation
or
Modification
Next gen. analysis & processing pipeline testing
11/14/17 YSSS 2017 3
Example Validation Test
11/14/17 YSSS 2017 4
Galaxy Cluster Validation
- Details of galaxy clustering are very sensitive to cosmology
11/14/17 YSSS 2017 5
Galaxy Cluster Validation
- Details of galaxy clustering are very sensitive to cosmology
11/14/17 YSSS 2017 5
Redshift-space Distortions
z_\mathrm{cosmological}
z_\mathrm{cosmological} + z_\mathrm{peculiar} \rightarrow z_\mathrm{obs}
Galaxy Cluster Validation:
11/14/17 YSSS 2017 6
z_\mathrm{cosmological}
v_i = c(z_i-\bar{z})/(1+\bar{z})
Redshift-space Distortions
Galaxy Cluster Validation:
11/14/17 YSSS 2017 6
z_\mathrm{cosmological} + z_\mathrm{peculiar} \rightarrow z_\mathrm{obs}
Velocity Dispersion-Mass Relation
Galaxy Cluster Validation:
11/14/17 YSSS 2017 7
SPT-GMOS spectroscopic sample
Bayliss+ 2016, Figure 3
Velocity Segregation
Galaxy Cluster Validation:
11/14/17 YSSS 2017 8
Synthetic Catalog Release
- Successful first-stage validation of ProtoDC2 announced to the LSST-DESC collaboration, catalog released and working groups can begin testing codes
-
Toward the future:
- further refinement of protoDC2
- large-scale synthetic skies (DC2)
- LSST first light!
11/14/17 YSSS 2017 9
Thank You!
11/14/17 YSSS 2017 10
1+z_\mathrm{obs} = (1+z_\mathrm{pec})(1+z_\mathrm{H})
z_\mathrm{obs}-z_\mathrm{H} = z_\mathrm{pec}(1 + z_\mathrm{H})
1+z = \sqrt{ \dfrac{1+v/c}{1-v/c} } \rightarrow z\approx v/c
v_\mathrm{pec} = c(z_\mathrm{obs}-z_{H})/(1+z_{H})
11/14/17 YSSS 2017 11
Validation of Synthetic Galaxy Catalogs
By jhollowed
