SEL-ID Catalog Product¶

$SetSchemaPath le3/id/sel/out/euc-le3-id-sel-Catalog.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:

SEL_Collect

Consumers:

SEL_Select
VMSP_Train
VMSP_Sample

Processing function using the data product¶

ID SEL-VMSP pipeline
SWG-GC, SWG-GAE

Proposed for inclusion in EAS/SAS¶

This product is proposed for inclusion in the SAS: yes

The catalog is needed by the GC-SWG for building alternative galaxy samples for verification and science analyses.

Data Product Elements¶

$PrintDataProductElements

Detailed Description of the Data Product¶

This is the main galaxy catalog constructed for the spectroscopic galaxy clustering analyses. It contains galaxy properties selected from OU-SPE (spectroscopic) and OU-MER (photometric) measurements.

This catalog is stored in a FITS file. The second HDU is a binary table extension that contains metadata in the keywords and the catalog in the data table.

Milky Way extinction correction

SELID applies the Milky Way extinction correction to the broadband and line fluxes in the SEL catalog. The corrected fluxes are found in the columns with the _MWCORR suffix, for example FLUX_H_APER_MWCORR and FLUX_HALPHA_TOT_MWCORR.

For monocromatic flux, the corrected flux is

\[f_{corr}(\lambda) = f_{obs}(\lambda)10^{0.4 k(\lambda)E_{B-V}}\]

where $k(\lambda) = A(\lambda)/E_{B-V}$ is the extinction curve. We use the extinction curve from Fitzpatrick 1999 PASP 111 63 with $R_V=3.1$.

For broadband flux in filter X, we use the coefficient $C_X$, and the corrected flux is

\[f_{X, corr} = f_{X, obs} 10^{0.4 C_X E_{B-V}}\]

The coefficient is computed as,

\[C_X = -2.5 \log \frac{\int T_X(\lambda) 10^{-0.4 k(\lambda)} \frac{1}{\lambda} d\lambda}{\int T_X(\lambda) \frac{1}{\lambda} d\lambda}\]

This calculation is based on a flat reference SED per unit frequency, $f_\nu(\nu)=const$, which gives per unit wavelength, $f_{\lambda}(\lambda)\propto 1/\lambda^2$, and $T_X(\lambda)$ is the total instrument transmission curve including quantum efficiency.

Using the PLM, filter transmission and quantum efficiency curves in the mission database, we find the following extinction coefficients:

Filter	Coefficient
VIS	2.09
NISP Y	1.03
NISP J	0.702
NISP H	0.474

Metadata¶

The metadata stored in the Data element of the XML contains useful information about the survey coverage. Here is a brief summary of the metadata:

Data/

Key	Type	Description
CalblockIdList	CalblockIdList
Catalog	randomCatalogFile	Pointer to the FITS data file.
CatalogDescription	CatalogDescription
IslandLabelList	IslandLabelList
ObservationIdList	ObservationIdList
PatchIdList	PatchIdList
SpatialCoverage	SpatialCoverage
SpectralCoverage	SpectralCoverage
TileIndexList	TileIndexList

Keywords Extension Header CATALOG¶

This fits table is expected to contain the following keywords in primary HDU, characterizing the parameters of the product:

$PrintExtensionHeader fit/euc-le3-id.xml le3.id.catalog CATALOG

Table¶

The table is expected to contain the following columns:

$PrintCatalog fit/euc-le3-id.xml le3.id.catalog