Output Product: Tomographic Cosmic Shear Correlation
$SetSchemaPath le3/wl/twopcf/out/euc-le3-wl-twopcf-ShearShear2D.xsd
Data Product Name
$PrintDataProductName
Data Product Custodian
$PrintDataProductCustodian
Name of the Schema File
$PrintSchemaFilename
Last Edited for DPDD Version
1.1
Processing Elements Creating / Updating / Using the Product
Creators:
Consumers:
Processing Function using the products
SGS pipeline output product to be used by LE3 and SWGs
Proposed for inclusion in EAS/SAS
This product is proposed for inclusion in the SAS: Yes
Motivation: the product contains the two-point shear-shear tomographic real-space correlation functions requested by the RSD document.
Data Product Elements
$PrintDataProductElements
Detailed Description of the Data Product
This product contains the tomographic cosmic shear 2PCF.
This output product is a fits file (see le3.wl.2pcf.output.shearshear2d in the following FITS descriptors).
Extra metadata associated to the FITS container are the following:
SpatialCoverage a description of the spatial footprint [optional, cot:spatialFootprint],
CatalogSelection: describing the selection in the input catalogues [optional, up to 1 element]
CatalogFileName: the name of the input catalogue [sys:dataFileName]
CatalogSHE: type of input catalogue [string among “BFD”, “KSB”,
“LensMC”,”MomentsML”,”REGAUSS”,”MER_PHZ”, “OTHER” ]
Selection: selection associated to catalogue [string]
CatalogUse: for which use case the catalog is employed (=[“ShearShear”])
[string among “PosPos”, “PosShear”, “ShearShear”]
CatalogInfo: whether position or shear information is used in this catalogue
[string among “Pos”, “Shear”] (=[“Shear”])
CatalogOrder: order associated to catalogue for reporting (e.g. BIN_ID1)[int32]
The fits file contains:
a primary array containing important computation parameters as keywords,
binary tables in the next HDUs with cosmic shear 2-PCF for specific redshift bins.
Primary Array
This fits table is expected to contain the following keywords in primary HDU,
characterizing the important parameters of the product:
$PrintPrimaryHeader fit/euc-le3-wl.xml le3.wl.2pcf.output.shearshear2d
THMIN: minimal angular value chosen for spatial binning [DoubleKeyword]
THMAX: maximal angular value chosen for spatial binning [DoubleKeyword]
OATH: maximal open angle value used for the approximation [DoubleKeyword]
THUNIT: unit of spatial distance [StringKeyword]
BINSCALE: if linear or logarithmic scales are used for output [StringKeyword]
COORDSYS: if spherical or cartesian computation of distances [StringKeyword]
SHE_SOFT: which SHE catalogue used [StringKeyword]
SHE_SEL: selection for shear catalogue [StringKeyword]
SOFTNAME: name of software used for 2PCF [StringKeyword]
SOFTVERS: version of software used for 2PCF [StringKeyword]
Table (HDU=1…)
The following keywords are added to the header of the HDUs:
$PrintHDUTableContents fit/euc-le3-wl.xml le3.wl.2pcf.output.shearshear2d SHEARSHEAR2D_2PCF_n
BIN_ID1: bin for first catalog [IntegerKeyword]
BIN_ID2: bin for second catalog [IntegerKeyword]
EXTNAME: “SHEARSHEAR2D_2PCF”
and the columns are:
THETA: mean angular separation in the bin [D, float64]
XI_P: cosmic shear 2PCF \(\xi_+\) [D, float64]
XI_M: cosmic shear 2PCF \(\xi_-\) [D, float64]
XI_X: cosmic shear 2PCF \(\xi_x\) [D, float64]
WEIGHT: total weight for the bin [D, float64]
SQRT_D: Poisson error associated to the bin [D, float64]
SQRT_DCOR: Poisson error associated to the bin, down-weighted by the ratio
of number of galaxy pairs by the number of nodes [D, float64].
N_PAIR: Number of pairs [D, float64]
The correlation functions are defined as:
\[\begin{split}\xi_\pm &=\langle \epsilon_t \epsilon_t\rangle \pm \langle \epsilon_x \epsilon_x\rangle\\
\xi_x &= \langle \epsilon_t \epsilon_x \rangle\end{split}\]
with \(\epsilon_t\) tangential component and \(\epsilon_x\) cross component of ellipticity.
Note
Under discussion is the possibility in the future of having as first HDU a summary table with information
on the binning for 2PCF tables (HDU>2):
THETA: angular separation (center of spatial bin) [D, float64]
MIN_THETA: minimal angular separation in the bin [D, float64]
MAX_THETA: maximal angular separation in the bin [D, float64]
and in the second hdu a summary table to allow fast access to the HDU corresponding to a particular
bin combination:
BIN_ID1: bin for first catalog [J, int32]
BIN_ID2: bin for second catalog [J, int32]
HDU: HDU index [J, int32]