The main input to the code is a catalog that contains columns of photometric fluxes and associated errors for a given set of filters. Also required is a file that defines the filter transmission curves used in the catalog, an example of which is provided with the code. Default versions of the template set and prior probability functions are provided that produce good results with deep K-selected photometric catalogs, though any user-defined version of these files can be used.
All of the code parameters are handled in a single
parameter file, zphot.param, that is modeled after
the parameter file used by HyperZ
(Bolzonella, Miralles & Pello, 2000). Below is a
clickable parameter file that contains descriptions of the
parameters as found in the user's manual.
#### EAZY Default parameters, zphot.param.default
## Filters FILTERS_RES
FILTER_FORMAT
SMOOTH_FILTERS
SMOOTH_SIGMAmaster.FILTER.RES
1
y
100. # Filter transmission data
# Format of FILTERS_RES file -- 0: energy- 1: photon-counting detector
# Smooth filter curves with Gaussian
# Gaussian sigma (in Angstroms) to smooth filters## Templates TEMPLATES_FILE
TEMPLATE_COMBOS
NMF_TOLERANCE
WAVELENGTH_FILE
TEMP_ERR_FILE
TEMP_ERR_A2
SYS_ERR
APPLY_IGM
DUMP_TEMPLATE_CACHE
USE_TEMPLATE_CACHE
CACHE_FILEtemplates/eazy_v1.0.spectra.param
a
1.e-4
lambda.def
templates/TEMPLATE_ERROR.eazy_v10
1.00
0.00
y
n
n
tempfilt.dat
# Template definition file
# Template combination options:
# 1 : one template at a time
# 2 : two templates, read allowed combinations from TEMPLATES_FILE
# -2 : two templates, all permutations
# a or 99 : all templates simultaneously
# Tolerance for non-negative combinations (TEMPLATE_COMBOS=a)
# Wavelength grid definition file
# Template error definition file
# Template error amplitude
# Systematic flux error (% of flux)
# Apply Madau 1995 IGM absorption
# Write binary template cache
# Load in template cache
# Template cache file (in OUTPUT_DIRECTORY)
## Input Files CATALOG_FILE
NOT_OBS_THRESHOLD
N_MIN_COLORS hdfn_fs99_eazy.cat
-90
5# Catalog data file
# Ignore flux point if <NOT_OBS_THRESH
# Require N_MIN_COLORS to fit## Output Files OUTPUT_DIRECTORY OUTPUT # Directory to put output files in MAIN_OUTPUT_FILE photz # Main output file, .zout PRINT_ERRORS y # Print 68, 95 and 99% confidence intervals CHI2_SCALE 1.0 # Scale ML Chi-squared values to improve confidence intervals VERBOSE_LOG y # Dump information from the run into [MAIN_OUTPUT_FILE].param OBS_SED_FILE n # Write out observed SED/object, .obs_sed TEMP_SED_FILE n # Write out best template fit/object, .temp_sed POFZ_FILE n # Write out Pofz/object, .pz BINARY_OUTPUT n # Save OBS_SED, TEMP_SED, PZ in binary format to read with e.g IDL ## Redshift / Mag prior APPLY_PRIOR
PRIOR_FILE
PRIOR_FILTER
PRIOR_ABZP y
prior_K_zmax7.dat
28
25.0 # Apply apparent magnitude prior
# File containing prior grid
# Filter from FILTER_RES corresponding to the columns in PRIOR_FILE
# AB zeropoint of fluxes in catalog. Needed for calculating apparent mags! ## Redshift Grid FIX_ZSPEC
Z_MIN
Z_MAX
Z_STEP
Z_STEP_TYPE n
0.01
6.0
0.01
1 # Fix redshift to catalog zspec
# Minimum redshift
# Maximum redshift
# Redshift step size
# 0 = ZSTEP, 1 = Z_STEP*(1+z)## Zeropoint Offsets GET_ZP_OFFSETS n # Look for zphot.zeropoint file and compute zeropoint offsets ZP_OFFSET_TOL 1.e-4 # Tolerance for iterative fit for zeropoint offsets ## Cosmology H0OMEGA_LOMEGA_L 70.0
0.3
0.7 # Hubble constant
# Omega_matter
# Omega_lambda