Information on resource 'Gaia early DR3 Mock Catalogue (gedr3mock)'

Services defined within this resource descriptor

• Gaia early DR3 Mock Bulk Download

Tables defined within this resource descriptor

• gedr3mock.generated_data – queryable through TAP and ADQL

  This contains the data actually generated. Users probably want to use the gdr2mock.main table that (fairly well) follows the Gaia DR2 data model.

• gedr3mock.maglim_5 – queryable through TAP and ADQL

  This table gives empirical magnitude limits for G and BP bands derived from Gaia DR2 with G < 20.7 mag for HEALPixels of 5 (scale roughly ~2 degrees). For each band we have 4 different variants:

  1. no additional condition,
  2. parallax available,
  3. BP-RP available,
  4. parallax and BP-RP available.

  For BP mag limits we also require that BP is available. The magnitude limits are approximated by the mode of the magnitude distribution in a specific HEALpix. Since this mode estimator is prone to Poisson noise in low density areas we report the magnitude limits in two flavours:

  1. directly the mode estimator
  2. the same as the mode estimator,

  except that in healpixel with a stellar density below 1e5 sources per square degree the limit is arbitrarily set to 20.7 mag. These magnitude limits were created using the gdr2_completeness package and users are encouraged to create custom-made magnitude limits with specific conditions, e.g. RVS sample with good parallaxes.

• gedr3mock.maglim_6 – queryable through TAP and ADQL

  This table gives empirical magnitude limits for G and BP bands derived from Gaia DR2 with G < 20.7 mag for HEALPixels of 6 (scale roughly ~1 degrees). For each band we have 4 different variants:

  1. no additional condition,
  2. parallax available,
  3. BP-RP available,
  4. parallax and BP-RP available.

  For BP mag limits we also require that BP is available. The magnitude limits are approximated by the mode of the magnitude distribution in a specific HEALpix. Since this mode estimator is prone to Poisson noise in low density areas we report the magnitude limits in two flavours:

  1. directly the mode estimator
  2. the same as the mode estimator,

  except that in healpixel with a stellar density below 1e5 sources per square degree the limit is arbitrarily set to 20.7 mag. These magnitude limits were created using the gdr2_completeness package and users are encouraged to create custom-made magnitude limits with specific conditions, e.g. RVS sample with good parallaxes.

• gedr3mock.maglim_7 – queryable through TAP and ADQL

  This table gives empirical magnitude limits for G and BP bands derived from Gaia DR2 with G < 20.7 mag for HEALPixels of 7 (scale roughly ~0.5 degrees). For each band we have 4 different variants:

  1. no additional condition,
  2. parallax available,
  3. BP-RP available,
  4. parallax and BP-RP available.

  For BP mag limits we also require that BP is available. The magnitude limits are approximated by the mode of the magnitude distribution in a specific HEALpix. Since this mode estimator is prone to Poisson noise in low density areas we report the magnitude limits in two flavours:

  1. directly the mode estimator
  2. the same as the mode estimator,

  except that in healpixel with a stellar density below 1e5 sources per square degree the limit is arbitrarily set to 20.7 mag. These magnitude limits were created using the gdr2_completeness package and users are encouraged to create custom-made magnitude limits with specific conditions, e.g. RVS sample with good parallaxes.

• gedr3mock.main – queryable through TAP and ADQL

  A synthetic Milky Way catalog mimicking Gaia EDR3 in stellar content and data model.

• gedr3mock.parsec_props – queryable through TAP and ADQL

  This table is intended to augment the Gaia photometry of GeDR3 Mock stars with other bands and extinctions (Sloan, Johnson and 2MASS). The grid was generated by binning all isochrones in logg, teff, and feh and taking the median values of all isochrone models that fall within one bin. We also report the median values of some astrophysical parameters so that one can check how far the actual star abundances deviate from the bin's median. For the extinction we report the extinction for the specific isochrone bin in a specific photometric band for 6 different values of monochromatic extinction, A_0, i.e. 1,2,3,5,10,20 mag.

  Sometimes stars in GeDR3 Mock depart from the isochrone grid, because, e.g., the feh value is outside of the grid or values have been interpolated by Galaxia in the catalog generation from the Parsec isochrones. Then the index_parsec is assigned to the nearest neighbour in log_lum and log_teff.

• gedr3mock.rvs_sample_pi_all

  This table lists source_ids of gedr3mock objects that are drawn at random using to the selection function found in Gaia DR2 for stars with a full six-parameter solution as derived in bibcode`TODO`. It is intended to be used to test selection effects in observables on underlying stellar population parameter distributions.

  The completeness function was applied in spatial bins of HEALPix level 5, and bins of one each in GRVS magnitude and G-GRP color, yielding 7.2e6 sources.

  This table gives a selection biased so as to match its mean parallax to the the mean parallax of Gaia DR2 in each bin. The gedr3mock.rvs_sample_pi_random table reflects an unbiased sample, and gedr3mock.rvs_sample_pi_rvs reflects a sample biased to match the mean parallax of the RVS sample in Gaia DR2 in each bin.

• gedr3mock.rvs_sample_pi_rvs

  This table lists source_ids of gedr3mock objects that are drawn at random using to the selection function found in Gaia DR2 for stars with a full six-parameter solution as derived in bibcode`TODO`. It is intended to be used to test selection effects in observables on underlying stellar population parameter distributions.

  The completeness function was applied in spatial bins of HEALPix level 5, and bins of one each in GRVS magnitude and G-GRP color, yielding 7.2e6 sources.

  This table gives a selection biased so as to match its mean parallax to the the mean parallax of the RVS sample in Gaia DR2 in each bin. The gedr3mock.rvs_sample_pi_random table reflects an unbiased sample, and gedr3mock.rvs_sample_pi_all reflects a sample biased to match the mean parallax of the entire Gaia DR2 in each bin.

• gedr3mock.rvs_sample_unbiased

  This table lists source_ids of gedr3mock objects that are drawn at random using to the selection function found in Gaia DR2 for stars with a full six-parameter solution as derived in bibcode`TODO`. It is intended to be used to test selection effects in observables on underlying stellar population parameter distributions.

  The completeness function was applied in spatial bins of HEALPix level 5, and bins of one each in GRVS magnitude and G-GRP color, yielding 7.2e6 sources.

  This table gives an unbiased selection. The gedr3mock.rvs_sample_pi_rvs table reflects a sample biased to match the mean parallax of the RVS sample in each bin, and the gedr3mock.rvs_sample_pi_all reflects a sample biased to match the mean parallax of the entire Gaia DR2 in each bin.

Copyright, License, Acknowledgements

• To the extent possible under law, the publisher has waived all copyright and related or neighboring rights to the Gaia eDR3 mock catalogue. For details, see the Creative Commons CC0 1.0 Public Domain dedication. Of course, you should still give proper credit when using this data as required by good scientific practice.

  
• https://spdx.org/licenses/CC0-1.0.html

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