The 4th joint meeting of eBOSS-DESI France

Europe/Paris
Marseille

Marseille

LAM: room "Mistral" on the 2nd floor CPPM: the amphitheatre
Description

The Centre de Physique des Particules de Marseille (CPPM) and the Laboratoire d'Astrophysique de Marseille (LAM) are very pleased to be hosting the eBOSS-DESI France meeting for its 4th edition.

One of the goals of these series of informal eBOSS-DESI meetings is to put in contact researchers working in similar topics within eBOSS and DESI collaborations.

 

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NEW: A visit to the Winlight company based in Pertuis is scheduled on Thursday 4th morning (an arrival at the Aix-en-Provence TGV rail-station is required between 9:30 and 10am). Please register soon if you want to participate (limited places).

The collaboration meeting will start on Thursday 4th at 2pm at the LAM (Chateau-Gombert campus). It will continue on Friday, October 5th at the CPPM (Luminy campus).

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Please register if you plan to attend and submit a title and an abstract if you aim to give a talk.

We encourage PhD and Postdocs to present their on-going work.

We hope to see you soon in Marseille,

The organizers.

Inscription
eBOSS-DESI France meeting
Participants
  • Adam Hawken
  • Charling Tao
  • Christophe Yeche
  • Eric Jullo
  • Etienne Burtin
  • Ignasi Pérez-Ràfols
  • Jean-Gabriel cuby
  • Jim Rich
  • Marie Aubert
  • Matthew Pieri
  • Pauline Zarrouk
  • Pierros Ntelis
  • Qiufan Lin
  • Romain Paviot
  • Sean Morrison
  • Solene Chabanier
  • Stephanie Escoffier
  • Sylvain de la Torre
  • Sylvain Gouyou Beauchamps
  • Victoria de Sainte Agathe
  • William GILLARD
    • 14:00 17:00
      LAM Day

      In Mistral meeting room on 2nd floor

      • 14:00
        Observations in Cosmology 20m

        In the era of upcoming redshift surveys, the sky will be more revealing than ever! In this talk, I will summarise standard and non standard observational methods and scenarios.

        Orateur: Pierros Ntelis (CPPM)
      • 14:20
        DT-Voids and BAO 20m

        Status of work

        Orateur: Mme Charling Tao (CPPM)
      • 15:00
        Coffee break 30m
      • 15:30
        Measuring the growth rate of structure with cosmic voids in GAMA 20m

        We measure the cross correlation of voids and galaxies in the Galaxy And Mass Assembly (GAMA) survey. This cross correlation exhibits an anisotropy indicative of redshift space distortions (RSD) caused by galaxies falling from the centres of voids onto the surrounding mass. We introduce a model for the multipoles of the void-galaxy cross correlation function that allows for void positions to be subject to RSD themselves. We fit this model to the data and measure the growth rate parameter associated with galaxies, $\beta_g=0.481^{+0.049}_{-0.048}$, finding no strong evidence for void motions.

        I will also present some plans for voids in the eBOSS/DES overlap.

        Orateur: Dr Adam Hawken (CPPM)
      • 15:50
        DESxeBOSS gravity test discussion 20m

        In this session, I will briefly mention my plans for this project, and try to set up a schedule for the analysis.

        Orateur: Eric Jullo (LAM)
      • 16:10
        Quasar identification with SQUEzE 20m

        We present the current performance of the machine-learning code, SQUEzE, to identify quasars and estimate their redshift. We compare its performance with that of QuasarNet and conclude that, while it may not be as accurate as QuasarNet, it is lighter and more flexible

        Orateur: Ignasi Pérez-Ràfols (LAM, Marseille)
  • vendredi 5 octobre
    • 10:00 13:00
      CPPM Day

      In the CPPM amphitheatre

      • 10:00
        Measurment of the BAO with Lya auto and cross correlation functions 20m

        I will present the current status of the Lya group

        Orateur: Mme victoria de sainte agathe (LPNHE)
      • 10:20
        Measuring Large-Scale Inhomogeneities of Metals 20m

        We are measuring the large scale of inhomogeneity of metals, which are expected to be associated with large scale proximity to quasars. These inhomogeneities are currently traced by combining oxygen, helium and hydrogen absorption, but in the future they will refer to directly observed quasar positions.

        Orateur: Sean Morrison (LAM)
      • 10:40
        DLA bias as a function of DLA properties 20m

        I am going to present the latest measurements of the DLA bias. In particular I'll present its evolution with redshift, column density of the DLAs, and the metal strength of the DLAs. The metal strength is defined from an average of equivalent widths of the strongest detectable low-ionization metal lines. These results confirm the physical origin of the relation of bias factors measured from cross-correlation studies to the host halos of the absorbers.

        Orateur: Ignasi Pérez-Ràfols (LAM, Marseille)
      • 11:00
        Coffee break 30m
      • 11:30
        The Study of Galaxies in Absorption and their use as a tracer. 20m

        I will discuss latest results on the properties of galaxies traced by the strong Lyman-alpha forest absorption and, on combining them with Damped Lyman alpha forest absorbers, their use as a BAO tracer.

        Orateur: Matthew Pieri (Laboratoire d'Astrophysique de Marseille)
      • 11:50
        1D power spectrum from Lya forest with eBOSS quasars 20m

        Presentation of the analysis of the 1D power spectrum from the lyman alpha forest with DR14

        Orateur: Solène Chabanier (CEA Saclay)
      • 12:10
        eBOSS-DESI France Planning Discussion 50m