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gaia data release 3 documentation

20.2 Astrophysical parameter tables

20.2.6 oa_neuron_xp_spectra

This is the table hosting the prototype BP/RP spectrum corresponding to each of the neurons of the Self-Organised-Map produced by the Apsis module OA. Other neuron attributes, such as statistics on various parameters, are available in another table: oa_neuron_information. See Section 11.3.12 for further details.

Columns description:

solution_id : Solution Identifier (long)

All Gaia data processed by the Data Processing and Analysis Consortium comes tagged with a solution identifier. This is a numeric field attached to each table row that can be used to unequivocally identify the version of all the subsystems that were used in the generation of the data as well as the input data used. It is mainly for internal DPAC use but is included in the published data releases to enable end users to examine the provenance of processed data products. To decode a given solution ID visit https://gaia.esac.esa.int/decoder/solnDecoder.jsp.

neuron_id : Neuron identifier (long)

A unique single numerical identifier of the neuron.

neuron_row_index : Row index of the neuron in the Self-Organised Map lattice (short)

A row index which determines the position of the neuron within the Self-Organized Map lattice, together with neuron_column_index.

neuron_column_index : Column index of the neuron in the Self-Organised Map lattice (short)

A column index which determines the position of the neuron within the Self-Organized Map lattice, together with neuron_row_index.

xp_spectrum_prototype_flux : Normalised flux at wavelength xp_spectrum_prototype_wavelength for the preprocessed XP spectrum that best represents the neuron (prototype) (float)

Flux at wavelength value specified by xp_spectrum_prototype_wavelength for the preprocessed XP spectrum (including normalisation) that best represents the sources that belong to the neuron (prototype). See Section 11.3.12 for further details.

xp_spectrum_prototype_wavelength : Wavelength associated with the XP spectrum flux values (float, Length & Distance[nm])

Wavelength value associated with the xp_spectrum_prototype_flux and xp_spectrum_template_flux fluxes.

xp_spectrum_template_flux : Normalised flux at wavelength xp_spectrum_prototype_wavelength for the preprocessed XP spectrum corresponding to the neuron template (float)

Flux at wavelength value specified by xp_spectrum_prototype_wavelength for the preprocessed XP spectrum (including normalisation) of the reference template assigned to the neuron. This field can be null if no template is assigned. See Section 11.3.12 for further details.