LERMA UMR8112

Laboratoire d’Études du Rayonnement et de la Matière en Astrophysique et Atmosphères



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VAMDC

by nicolas.moreau@obspm.fr - published on

VAMDC

Virtual Atomic and Molecular Data Centre Consortium


The "Virtual Atomic and Molecular Data Centre Consortium" (VAMDC Consortium) is a worldwide consortium which federates Atomic and Molecular databases through an e-science infrastructure and an organisation to support this activity (http://www.vamdc.org/structure/how-to-join-us/).


About 90% of the inter-connected databases handle data that are used for the interpretation of astronomical spectra and for the modeling in media of many fields of astrophysics. The VAMDC Consortium has connected databases from other fields such as the radiation damage and the plasma communities.


The infrastructure is composed of several key components :

  • The Portal is a central access point to look for data. It provides a graphical user interface where users can build queries that are distributed to all the relevant databases at the same time.
  • The species database is a repository of all the atomic and molecular species available in VAMDC. It is populated by gathering daily the chemical species available from each database composing the infrastructure. The species database provides a fast and convenient way to discover where data are located.
  • Each database in the infrastructure is queryable through a web service. They are registered in the VAMDC registry


As a major actor in the field of atomic and molecular physics, the LERMA laboratory is a central element in both the governance and the technical maintenance and evolution of the infrastructure. A team of a senior astronomer and 3 software engineers is involved on different aspects :

  • Marie-Lise Dubernet Tuckey (Astronomer) : current chair of the board of director, scientific coordination.
  • Yaye Awa Ba (computer engineer) : development of the Spectcol software and the Basecol VAMDC node, web manager of the VAMDC website
  • Nicolas Moreau (computer engineer) : development of the VAMDC portal and species database, evolution of standards (convergence with IVOA standards), interface with node managers, co-chair of the technical board
  • Carlo-Maria Zwolf (computer engineer ) : executive director of VAMDC, development of the VAMDC querystore, co-chair of Group of European Data Experts in the Research Data Alliance (RDA) and co-chair of the Federation Identity Management Interest Group in the RDA

Séminaires à venir

Vendredi 14 juin 2019, 14h00
Salle de l'atelier, Paris
Astronomie au Pôle Sud en 1984 : la mission EMILIE
Jean-Michel LAMARRE
Observatoire de Paris/LERMA
résumé :
En 1984 une équipe du CNRS soutenue par l’INAG (INSU aujourd’hui), en association avec l’Université du Delaware et l’appui du programme antarctique des USA, a installé l’expérience EMILIE pour quelques semaines au Pôle Sud géographique pour y effectuer les premières observations astronomiques en ondes submillimétriques. Les conditions d’altitude et de température font du Pôle Sud un site unique pour ce domaine spectral, mais les conditions d’accès en sont particulièrement difficiles et les questions logistiques y occupent une place vitale, au sens propre.

Le récit de ces premières observations sera replacé dans ce contexte particulier et dans le cadre géographique exceptionnel de ce continent. On s’appuiera pour cela sur les cahiers de manip et sur des photos de la mission, mais on ne se privera pas d’utiliser les images les plus spectaculaires et les données les plus récentes de la recherche polaire, ni d’ailleurs celles de "l’âge héroïque" de l’exploration de l’Antarctique.

L’expérience EMILIE fut pour ses participants une étape importante du long apprentissage technique et scientifique qui a donné naissance au satellite Planck. On doit aussi y voir les prémices de l’observatoire submillimétrique aujourd’hui en activité au Pôle Sud, le « dark sector » de la station Amundsen-Scott.


 
Vendredi 21 juin 2019, 14h00
Salle de l'atelier, Paris
Accretion-driven turbulence and observational signatures
Pierre GUILLARD
IAP
 
Vendredi 5 juillet 2019, 14h00
Salle de l'atelier, Paris
Self-generated UV in molecular shocks
Andrew LEHMANN
ENS
 
Vendredi 20 septembre 2019, 14h00
----------, Paris
Challenging a Newtonian prediction through Gaia wide binaries
Xavier HERNANDEZ
UNAM, Mexico
résumé :
Under Newtonian dynamics, the relative motion of the components of a binary star should follow a Keplerian scaling with separation. Once orientation effects and a distribution of ellipticities are accounted for, dynamical evolution can be modelled to include the effects of Galactic tides and stellar mass perturbers. This furnishes a prediction for the relative velocity between the components of a binary and their projected separation. After reviewing recent work evidencing the existence of a critical acceleration scale in Elliptical Galaxies and Globular Clusters, I will show new results showing such a phenomenology in Gaia wide binaries using the latest and most accurate astrometry available. The results are consistent with the Newtonian prediction for projected separations below 7000 AU, but inconsistent with it at larger separations, where accelerations are expected to be lower than the critical a0 value of MONDian gravity. This result challenges Newtonian gravity at low accelerations and shows clearly the appearance of gravitational anomalies of the type usually attributed to dark matter at galactic scales, now at much smaller stellar scales.


 
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