Virtual Observatory for cosmological simulations Hervé Wozniak Journées LSST France 20-22 mars 2017

Cosmo sims for LSST preparation and analysis Need of suite of cosmological simulations (w/ or wo/ baryonic matter) to prepare for LSST observations and data analysis: Mock catalogs Weak/strong lensing mock maps Detection statistics (e.g. dwarfs) Etc. Feedback loop of LSST observations on cosmo sims (model parameters, baryonic physics etc.) http://terapix.phys.cmu.edu/CosmoMLStat/Welcome.html (2015) H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

Produits simulation Millenium… (mini-Millenium) Snapshots (DM part.) 2005, Blaizot & Lemson (MPA and GAVO) via recherches de structures Haloes Props. & Trees via modèle semi-analytique DB DB (L-)Galaxies Spectra MoMAF online Mock cat. DM part. Mock cat. haloes Mock cat. galaxies Mock cat. spectra Lensing maps SZ/Xray … Mock image galaxies Mock image spectra Lensing maps

What is the Virtual Observatory? « an enabling and coordinating entity to foster the development of tools, protocols, and collaborations necessary to realize the full scientific potential of astronomical databases in the coming decade » NVO White Paper, juin 2000 Science driven initiative Immediate keyword: interoperability  communication  interfaces  standardization  international organization (i.e. W3C for the Web) International coordination: IVOA (International Virtual Observatory Alliance) French partner: OV-France funded by INSU and CNES H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

Simplified access to products interoperability Lemson & Colberg 2004 H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

‘Theoretical’ Virtual Observatory Taking care of the specificity of simulated data no sky coordinates, need to keep track of algorithms, physical recipes, input parameters, etc. Job of the IVOA Theory Interest Group since 2004 Position of the problem (main steps): Discovering published simulation projects Through VO-registries, googlization, word of mouth, etc. For selected projects, discovering simulation datasets Through browsing… Retrieving data full datasets or cutout in nD in case of Pb Asynchronous download… H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

SimDAL: Simulation Data Access Layer Define SimDAL API in 3 parts: Repository (discovery) Search (for a relevant dataset in a project) Data Access Core use cases: R1: Discover sets of simulations published in the Virtual Observatory and find the associated services. Examples: Discover services publishing simulations of large structures in a cosmological context or services publishing synthetic stellar spectra. R2: Find particular simulations and their associated datasets according to specific input parameters or characteristics of the outputs (for e.g. statistics on the results). Example: In a service publishing synthetic stellar spectra, find models of stars with an effective temperature between 2000 and 3000 K. R3: Download simulation raw datasets or subsets extracted with a cut-out. Example: Download a data cube of a simulation of dark matter or download a theoretical spectrum in a specific wavelength range. H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

SimDM: Simulation Data Model Kind of ‘Provenance’ model for theoretical products H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

Controlled vocabulary Understanding the metadata Semantic web, SKOS, etc. http://votheory.obspm.fr/ Job of the IVOA semantic Working Group H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

The main (future) efforts for LSST Perform raw cosmological simulations Produce mock products according to LSST or Science consortia requirements Setup VO-compatible access services (how much fte?) (optional) Register in VO registries to enable discovery Only if a world-wide exposure is necessary/wanted Enjoy! H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

Examples of “theory” VO services http://gavo.mpa-garching.mpg.de/Millennium/ http://www.deus-consortium.org/deuvo/ https://tao.asvo.org.au/tao/ H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017

Additional reading https://arxiv.org/abs/1612.06380 “An online theoretical virtual observatory for hydrodynamical, cosmological simulations” Languignon D., Le Petit F. (eds), 2016, Simulation Data Access Layer 1.0, IVOA Proposed Recommendation (http://ivoa.net/documents/SimDAL/index.html) Lemson G., Wozniak H. (eds), 2012, Simulation Data Model 1.0 , IVOA Recommendation (http://www.ivoa.net/Documents/SimDM/20120503/index.html) Lemson G., Wozniak H., Zuther J. (eds.), 2008, « Framework for the inclusion of theory data and services in the VObs », Euro-VO DCA Theory Expert Group report (http://wiki.ivoa.net/internal/IVOA/IvoaTheory/EuroVO-DCA-D11-MPG-Final.pdf) Lemson G., Colberg J., 2004, « Theory in the VO » (http://wiki.ivoa.net/internal/IVOA/IvoaTheory/Theory_in_the_VO_whitepaper.pdf) Wozniak H., Chapter 14 : « Simulation et modélisation astrophysique dans le cadre de l’Observatoire virtuel », in « Modéliser & Simuler. Epistémologies & Pratiques de la modélisation et de la simulation », M. Silberstein & F. Varenne (Eds), Editions Matériologiques,  (2013, April 18th) H. Wozniak / Journées LSST France 20-22 mars 2017 20/03/2017