Roman HLSS Galaxy Mock Catalog ((Zhai et al. 2021)
https://ui.adsabs.harvard.edu/abs/2021MNRAS.501.3490Z/abstract

This is the data file for the Roman galaxy redshift survey mock catalog, produced by semi-analytical model --- Galacticus. 

This catalog was trimed from the whole simulation with only a few crucial columns and cut on emission line flux and H magnitude:

max(Halpha, [OIII])>5e-18 erg/s/cm^2: emission line flux is dust-free
AND
H-band<25: dust model with Av=1.6523

The input merger trees of dark matter halos are from one of the N-body simulations --- UNIT (http://www.unitsims.org)

The galaxy mock is split into 10 smaller subsamples. The details and formats are given below (NOTE: all lower-case names in parentheses added by IRSA 12/6/24):

Column 0:  RA  (ra)
Column 1:  DEC (dec)
Column 2:  redshift_cosmological (redshift_cosmological) redshift in real space
Column 3:  redshift_observed  (redshift_observed)        redshift in redshift space (perturbed by velocity)
Column 4:  velocity  (velocity)                          velocity along the line-of-sight, in unit of km/s
Column 5:  stellar mass  (stellar_mass)                  stellar mass, in unit of M_sun
Column 6:  SFR  (sfr)                                    star formation rate, in unit of M_sun/Gyr
Column 7:  halo mass  (halo_mass)                        Host Halo mass, in unit of M_sun/h; for centrals: it is the halo mass; for satellites: it is the host halo mass, not the subhalo mass.
column 8:  flux_Halpha6563  (flux_halpha6563)            flux of Halpha emission line, in unit of erg/s/cm^2
column 9:  flux_OIII5007  (flux_oiii5007)                flux of OIII 5007 emission line, in unit of erg/s/cm^2 
column 10: M_F158_Av1.6523  (m_f158_av1_6523)            H-band magnitude
column 11: nodeIsIsolated  (nodeisisolated)              flag for central/satellite: 1 for central; 0 for satellite

---------------------------------
The broad band magnitude is dust attenuated; the emission line flux/luminosity is dust free

The distance and RSD (Kaiser) are calculated using the Planck 2016 cosmology (consistent with UNIT simulation) which can be called by astropy:

from astropy.cosmology import FlatLambdaCDM
cosmo = FlatLambdaCDM(H0=67.74, Om0=0.3089)


A little bit on the dust model: The calibration of dust model is presented in https://arxiv.org/pdf/1907.09680.pdf
We choose Calzetti dust model with parameter Av=1.6523 to match the WISP number counts for Halpha; Av=1.9156 to match the Halpha LF from HiZELS. The catalog in this mock adopts Av=1.6523 for emission lines and broad band.



In order to get dust attenuated emission line luminosity/flux, just multiply the intrinsic luminosity (column 8 through column 9) by the following constants:


Av: 1.6523      Halpha6563: 0.28685
Av: 1.6523      OIII5007:   0.18706

Av: 1.9156      Halpha6563: 0.23509
Av: 1.9156      OIII5007:   0.14321