Galaxy Catalog Product

Data product name

DpdGalaxyCatalogProduct

Data product custodian

SIM

Data model tag

9.0.1

Name of the Schema file

euc-test-sim-GalaxyCatalogProduct.xsd

Schema documentation tag

Data product documentation:

Input data product for the SIM PF

Documentation for data product element Header:

Generic Header as specified in /sys

Documentation for data product element DpdGalaxyCatalogProduct:

Information related to a galaxy catalog covering a sky patch, and associated information required to reconstruct the galaxy spectra.

Data product elements

Header of type: sys:genericHeader

Data of type: sim:galaxyCatalogProduct

Parameters of type: ppr:genericKeyValueParameters

Processing Element(s) creating/using the data product

These catalogs are created by the CosmoSIM SWG, outside of the SIM PF.

Processing elements using the data product:

  • SIM_Tools/EuclidTU

  • SIM_Tools/ComputeFluxes

  • SIM_ELViS_Simulator/EuclidVis

  • SIM_TIPS_Simulator/EuclidNis

  • SIM_Imagem/EuclidNip

  • SIM_EXT/EuclidExt

Processing function using the data product

SIM_Tools, SIM_ELViS_Simulator, SIM_TIPS_Simulator, SIM_Imagem, SIM_EXT

Detailed description of the data product

A GalaxyCatalogProduct contains the following elements that describe a sky patch and associated information required to reconstruct galaxy spectra:

  • GalaxyCatalog: Galaxy catalogue filename, associated with the area it covers on the sky

  • SedLibrary: Library identifier, and data container to a the galaxy SEDs templates used to produce galaxy spectra

  • ExtinctionLawLibrary: Library identifier, and data container to the Extinction laws used to produce the galaxy spectra

  • ReferenceFilterFile: Data container with the filter throughput filename, used to renormalize the galaxy templates to apparent flux.

  • StampsLibrary: List of FITS files containing galaxy image thumbnails to paste in the simulated images (optional)

The name of the release is given by the DataSetRelease element in Header section of the data product.

GalaxyCatalog FITS format

The format of the input galaxy catalogue is specified by the FITS format sim.galaxyCatalog 0.3. More information can be found on the Redmine wiki. A catalogue contains the following columns.

Note that the fluxes include the lensing magnification factor. The intrinsic fluxes can be recovered by multiplying them by mu = (1-kappa)**2 - gamma1**2 - gamma2**2.

Parameters

  • SOURCE_ID: Unique TU id

  • HALO_ID: Unique halo id coming from the Flagship dark matter halo catalog

  • KIND: Galaxy type: 0: CENTRAL, 1: SATELLITE, 2: QSO, 3: HIGH REDSHIFT, 4: STRONG-LENSING SOURCE, 5: GLOBULAR-CLUSTER SOURCE

  • RA: Right ascension (J2000) without lensing in degrees

  • DEC: Declination (J2000) without in degrees

  • RA_MAG: Right ascension (J2000) with lensing in degrees

  • DEC_MAG: Declination (J2000) with in degrees

  • Z_OBS: Galaxy observed redshift (including peculiar velocity)

  • REF_MAG_ABS: Absolute magnitude used to scale emission lines width (usually in the r-band filter redshifted at z=0.1)

  • REF_MAG: Magnitude used to rescale template (usually apparent SDSS r band z=0.1 AB magnitude, but absolute for QSO and High-z. Does not include lensing magnification)

  • SED_TEMPLATE: SED template index in the SED library

  • EXT_LAW: COSMOS Extinction law index

  • EBV: Interpolated extinction strength for COSMOS extinction curve

  • HALPHA_LOGFLAM_EXT_MAG: logarithm of flux of Halpha (erg/cm**2/s) calibrated using Pozzetti model 3 (observed: includes extinction)

  • HBETA_LOGFLAM_EXT_MAG: logarithm of flux of Hbeta (erg/cm**2/s) calibrated using Pozzetti model 3 (observed: includes extinction)

  • O2_LOGFLAM_EXT_MAG: logarithm of flux of O2 (erg/cm**2/s) calibrated using Pozzetti model 3 (observed: includes extinction)

  • O3_LOGFLAM_EXT_MAG: logarithm of flux of O3 (erg/cm**2/s) calibrated using Pozzetti model 3 (observed: includes extinction)

  • N2_LOGFLAM_EXT_MAG: logarithm of flux of N2 (erg/cm**2/s) calibrated using Pozzetti model 3 (observed: includes extinction)

  • S2_LOGFLAM_EXT_MAG: logarithm of flux of S2 (erg/cm**2/s) calibrated using Pozzetti model 3 (observed: includes extinction)

  • BULGE_FRACTION: ratio of the flux in the bulge component to the total flux (often written B/T)

  • BULGE_R50: major-axis half-light radius in arcsec. For SL sources, this is the index in the stamps library. For GC sources, this is used to compute the core radius of the King profile.

  • DISK_R50: For disk-dominated galaxies, the disk_length is the major-axis exponential scalelength in arcsec (is 0 for bulge-dominated galaxies)

  • BULGE_NSERSIC: Sersic index of the bulge component. For stamp creation

  • BULGE_AXIS_RATIO: Bulge projected axis ratio (b/a). For stamp creation

  • INCLINATION_ANGLE: Galaxy inclination angle (where 0 degrees = face-on and 90 degrees = edge-on). Galaxy ellipticity for disk and bulge components are computed following the recipe in https://euclid.roe.ac.uk/projects/sgsshear/wiki/SHE-SIM. For stamp creation

  • DISK_ANGLE: position of the disk rotation axis (degrees) (assumption: bulge_angle = disk_angle) From North to East, with the major axis aligned in Declination

  • KAPPA: lensing convergence

  • GAMMA1: lensing shear for axis 1

  • GAMMA2: lensing shear for axis 2

  • AV: MW optical extinction in the V band

Note that Flagship assumes a flip sign in the declination axis (+DEC -> -DEC), i.e. there is a flip sign in gamma1 and gamma2 compared to the usual convention (see issue #10560 on Euclid redmine). Morphology parameters are ignored for QSO sources, because they are simulated point-like sources.

Fluxes

ind

Instrument

Filter

MDB variable name

TU variable name for flux

1

Euclid VIS

VIS

Combination of multiple variables

TU_FNU_VIS_MAG

2

EUCLID NISP

Y

Combination of multiple variables

TU_FNU_Y_NISP_MAG

3

J

Combination of multiple variables

TU_FNU_J_NISP_MAG

4

H

Combination of multiple variables

TU_FNU_H_NISP_MAG

5

DECam

g

ExternalData.BLA.BlancoDECamTotalTrans.g

TU_FNU_G_DECAM_MAG

6

r

ExternalData.BLA.BlancoDECamTotalTrans.r

TU_FNU_R_DECAM_MAG

7

i

ExternalData.BLA.BlancoDECamTotalTrans.i

TU_FNU_I_DECAM_MAG

8

z

ExternalData.BLA.BlancoDECamTotalTrans.z

TU_FNU_Z_DECAM_MAG

9

MegaCam

u

ExternalData.CFH.CFHTMegaCamTotalTrans.u

TU_FNU_U_MEGACAM_MAG

10

r

ExternalData.CFH.CFHTMegaCamTotalTrans.r

TU_FNU_R_MEGACAM_MAG

11

JPCam

g

ExternalData.JST.JSTJPCamTotalTrans.g

TU_FNU_G_JPCAM_MAG

12

Pan-STARRS

i

ExternalData.PAN.PanSTARRSTotalTrans.i

TU_FNU_I_PANSTARRS_MAG

13

z

ExternalData.PAN.PanSTARRSTotalTrans.z

TU_FNU_Z_PANSTARRS_MAG

14

HSC

z

ExternalData.SUB.SubaruHSCTotalTrans.z

TU_FNU_Z_HSC_MAG

15

GAIA

G

ExternalData.GAIA.TotalSystemTransmissionExpressedAsQE

TU_FNU_G_GAIA_MAG

16

Bp

TU_FNU_BP_GAIA_MAG

17

Rp

TU_FNU_RP_GAIA_MAG

18

LSST

u

ExternalData.LSS.LSSTTotalTrans.u

TU_FNU_U_LSST_MAG

19

g

ExternalData.LSS.LSSTTotalTrans.g

TU_FNU_G_LSST_MAG

20

r

ExternalData.LSS.LSSTTotalTrans.r

TU_FNU_R_LSST_MAG

21

i

ExternalData.LSS.LSSTTotalTrans.i

TU_FNU_I_LSST_MAG

22

z

ExternalData.LSS.LSSTTotalTrans.z

TU_FNU_Z_LSST_MAG

23

y

ExternalData.LSS.LSSTTotalTrans.y

TU_FNU_Y_LSST_MAG

24

KIDS

u

ExternalData.KID.KIDSTotalTrans.u

TU_FNU_U_KIDS_MAG

25

g

ExternalData.KID.KIDSTotalTrans.g

TU_FNU_G_KIDS_MAG

26

r

ExternalData.KID.KIDSTotalTrans.r

TU_FNU_R_KIDS_MAG

27

i

ExternalData.KID.KIDSTotalTrans.i

TU_FNU_I_KIDS_MAG

28

2MASS

J

ExternalData.2MA.2MASSTotalRelativeResponse.J

TU_FNU_J_2MASS_MAG

29

H

ExternalData.2MA.2MASSTotalRelativeResponse.H

TU_FNU_H_2MASS_MAG

30

Ks

ExternalData.2MA.2MASSTotalRelativeResponse.Ks

TU_FNU_KS_2MASS_MAG