In this talk, I will review the status, recent achievements and scientific results from the Fink project, and discuss the future roadmap.
Reproducibility is a very important topic in today's research world.
With the upcoming wealth of data and amount of code needed to process it, using an adequate set of tools is key to help you and your colleagues ensure the produced results will be reproducible, or at least keep track of how they were achieved. This is what MLOps intends to do.
In this presentation I will define what are...
In the interest of improving photo-z estimation with template fitting methods, data from observations with FORS2 has been used to generate templates to be used in LEPHARE-like code. An in-house estimator enables access to the whole posterior distribution of redshift and aims to help us understand how to generate / select the best templates, and how to extract the closest point-estimate to the...
Upcoming deep optical surveys such as the Vera C. Rubin Observatory Legacy Survey of Space and Time will scan the sky to unprecedented depths and detect billions of galaxies. This amount of detections will however cause the apparent superposition of galaxies on the images, called blending, and generate a new systematic error due to the confusion of sources. As consequences, the measurements of...
Understanding the impact of astrophysical environment on type Ia supernovae (SNe Ia) properties is crucial to minimize systematic uncertainties in cosmological analyses based on this probe. We investigated the dependence of the SN Ia SALT2.4 light-curve stretch on the distance from their nearest galaxy cluster to study a potential effect of the intracluster medium (ICM) environment on SNe Ia...
Cosmological parameters can be inferred from the measurement of cluster abundance in the unbinned regime. The standard unbinned likelihood is based on Poisson statistics and does not include the Super-Sample Covariance (SSC), assumed to be negligible, arising from the fluctuation and clustering of the underlying matter density field. In this talk, I present a formalism to account for SSC in...
In this contribution we will present the data products that the Rubin project is deliver as part of the annual data releases of LSST as well as the services and tools to access them at the archive center and other data access centers around the world. We will provide the reference documentation prepared by Rubin for the needs of the science collaborations.
We will also mention the data...
Our aim is to extract SED templates from spectral and photometric data observed at high redshift to update the database of SED templates used for the PhotoZ SED Template fitting.
At present, we have a set of 550 spectra observed on the Fors2 instrument of the UT1 telescope at the VLT by astronomer Edmond Giraud (LUMP, Eric Nuss and J. Cohen-Tanugi) at an average redshift of 0.3.
These...
Nous travaillons sur une technique d’estimation des compensations de couleur par objet basées sur des observations spectroscopiques avec le télescope auxiliaire (AuxTel) à appliquer à la photométrie de LSST. Cette méthode se basera sur la comparaison des couleurs obtenues à partir de spectres standards lors de la traversée d'une atmosphère standard et lors de la traversée d'atmosphères...
With the upcoming Legacy Survey of Space and Time, the number of observed type Ia supernovae is expected to substantially increase, leading to a reduction in statistical uncertainties and thus placing flux calibration as the predominant source of uncertainty in constraining the dark energy equation of state parameter w.
Atmosphere is one of the last remaining sources of systematic...
Shear estimation began in 1995 with the KSB proposal, which essentially consists of using a combination of the second moments of the observed image of the galaxy and the PSF. Numerous other methods have been proposed over the years, and in most cases, the measurements derived from these methods have to be corrected using simulations, and therefore depend on the assumptions of these...
I will present the weak lensing analysis of the 6 very massive and complex Frontier Field clusters, using the BUFFALO HST observations, and I will discuss how the different measuring and modeling assumptions impact their mass estimation.
We look for signatures of the Hu-Sawicki f (R) modified gravity theory, proposed to explain the observed accelerated expansion of the
universe; in observations of the galaxy distribution, the cosmic microwave background (CMB), and gravitational lensing of the CMB.
We study constraints obtained by using observations of only the CMB primary anisotropies, before adding the galaxy power...
Gravitational wave (GW) multi-messenger (MM) observations of binary neutron star systems mergers (BNSs) are extremely challenging. With current GW interferometers, BNS detection rates are low. This will significantly improve with next generation gravitational wave interferometers, such as the Einstein Telescope (ET). These latter will detect thousands of BNS beyond the Local Universe,...
We will present measurements of atmospheric parameters obtained after fitting an atmospheric transmission model to the spectra of reference stars (CALSPEC) measured by the Auxtel telescope and reconstructed by the Spectractor program.
The ZTF-IN2P3 effort to achieve a photometric precision at the permile level for cosmology studies with type Ia supernova leads to the development of a model of the instrument. This model is used to extrapolate the measured filter transmission performed at normal incident angle by Caltech to the typical incident angle of the P48 Schmidt telescope used by ZTF.
