Issue/Revision: 1.0 Reference: Gaia Archive Status: Issued ESA UNCLASSIFIED - Releasable to the Public SourceDM: Some thoughts Jesús Salgado ESAC Science Data Center (ESDC)

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 2 ESA UNCLASSIFIED - Releasable to the Public Source DM group 1.Objective: a.Create a simple (but useful) SourceDM definition that could help in the publishing of catalogues through VO protocols b.Support on the definition for catalogues metadata for near-future missions (e.g. Gaia, Euclid,…) and allow the mapping for old ones c.Support interoperability operations between protocols (SED creation, crossmatch operations, etc) 2.Initial Team: a.Gerard Lemson, Sebastien Derrier, Laurent Michel, Bruno Merin, Tom Donaldson, Arnold Rots and myself b.Open for contributors 3.Status: a.DM activities still quite packed b.Discussions at Gaia DPAC Consortium level

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 3 ESA UNCLASSIFIED - Releasable to the Public External members Moon from Sydney

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 4 ESA UNCLASSIFIED - Releasable to the Public Gaia: DM in the core VO-DML Annotations in TAP_SCHEM A? Different structure? gbin

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 5 ESA UNCLASSIFIED - Releasable to the Public SourceDM v0.1

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 6 ESA UNCLASSIFIED - Releasable to the Public Source DM geometrical Support 1.STC-2 2.Attributes for: a.Position b.Errors c.Epoch/Reference frames d.Velocities/proper motion e.Extended sources (?) f.Redshift 3.Other attributes identified that could be needed a.Parallaxes b.Correlations

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 7 ESA UNCLASSIFIED - Releasable to the Public STC discussion flow Jos de Bruijne, 2012

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 8 ESA UNCLASSIFIED - Releasable to the Public STC discussion flow Jos de Bruijne, 2012

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 9 ESA UNCLASSIFIED - Releasable to the Public Positions and proper motion 1.Positions: a.(ra, dec) equatorial coordinates –Different coordinates systems could be (should be?) covered so we should need just to reuse the STC definitions but this produces certain complexities for the velocities –Maybe, this could go as a compulsory/optional depending on the protocol –Support to other coordinates within DM b.Epoch c.(raError, decError) 2.Proper motion: a.(muRa, muDec) –Proper motion on the two spherical coordinates b.Discussions on the projection c.(muRaError, muDecError)

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 10 ESA UNCLASSIFIED - Releasable to the Public Distances, parallaxes and radial velocity 1.Distance is a derived quantity. Conversion from parallaxes to distance requires certain assumptions 2.Parallaxes are preferred as a closer concept to a measurement quantity a.Both added to the DM 1.Radial velocity usually measured due to spectroscopic analysis a.Combination of the object radial velocity and cosmological redshifts b.Probably, radial velocity (in units of redshift) is better

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 11 ESA UNCLASSIFIED - Releasable to the Public Correlations 1.Not only errors are needed to understand the accuracy of the astrometric solution. Correlations are also needed. Holl et at, 2010

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 12 ESA UNCLASSIFIED - Releasable to the Public Correlations (II): Hipparcos columnConceptDescription H19Crl_Dec_RA(Dec over RA)xCos(delta) H20Crl_Plx_RA(Plx over RA)xCos(delta) H21Crl_Plx_Dec(Plx over DE) H22Crl_pmRA_RA(pmRA over RA)xCos(delta) H23Crl_pmRA_Dec(pmRA over DE) H24Crl_pmRA_Plx(pmRA over Plx) H25Crl_pmDec_RA(pmDE over RA)xCos(delta) H26Crl_pmDec_Dec(pmDE over DE) H27Crl_pmDec_Plx(pmDE over Plx) H28Crl_pmDec_pmRA(pmDE over pmRA)

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 13 ESA UNCLASSIFIED - Releasable to the Public Correlations (III): Gaia simulations Holl et at, 2010

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 14 ESA UNCLASSIFIED - Releasable to the Public Luminosities 1.Most of the catalogues are connected to luminosities through magnitudes/fluxes 2.Photometric values are usually represented by: a.Magnitude value and error b.Photometric system description c.Zero point d.Link to transmission curve e.Colours? 3.Flux values are usually represented by: a.Flux value and error b.Spectral coverage 4.Include PhotometryPoint as direct element from PhotometryDM 5.More complex connections by link to SpectralDM 2.0 a.Spectra b.Time Series

Photometry DM

Jesus Salgado | Source DM | IVOA Sydney | 30/10/2015 | Slide 18 ESA UNCLASSIFIED - Releasable to the Public Schedule 1.Iterate on DM UML during next months 2.Mapping to IVOA reused components 3.VO/DML model 4.Create a written version of the draft for next interop 5.Exercise to map Gaia catalogue (first and CompleteSource) to the IVOA Source DM 6.Modify Gaia Archive TAP+ component to include VO/DML preamble with SourceDM metadata 7.Agree with other catalogue providers on independent implementation Thanks!