Harnessing Virtual Observatory for Cosmological Simulations
Explore the utilization of Virtual Observatory for cosmological simulations, including the need for suite simulations, preparation for LSST observations, and the role of theoretical Virtual Observatory in managing simulated data specificity.
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Virtual Observatory for cosmological simulations Herv Wozniak Journ es 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) 2 H. Wozniak / Journ es 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 via mod le semi-analytique Props. & Trees 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 4 H. Wozniak / Journ es LSST France 20-22 mars 2017 20/03/2017
Simplified access to products interoperability Lemson & Colberg 2004 5 H. Wozniak / Journ es 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 6 H. Wozniak / Journ es LSST France 20-22 mars 2017 20/03/2017
SimDAL: Simulation Data Access Layer Define SimDALAPI 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. 7 H. Wozniak / Journ es LSST France 20-22 mars 2017 20/03/2017
SimDM: Simulation Data Model Kind of Provenance model for theoretical products 8 H. Wozniak / Journ es LSST France 20-22 mars 2017 20/03/2017
9 H. Wozniak / Journ es 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 10 H. Wozniak / Journ es 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! 1. 2. 3. 4. 5. 11 H. Wozniak / Journ es 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/ 12 H. Wozniak / Journ es 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 mod lisation astrophysique dans le cadre de l Observatoire virtuel , in Mod liser & Simuler. Epist mologies & Pratiques de la mod lisation et de la simulation , M. Silberstein & F. Varenne (Eds), Editions Mat riologiques, (2013, April 18th) 13 H. Wozniak / Journ es LSST France 20-22 mars 2017 20/03/2017
