Talks this week at the IAA
Seminarios IAA
IAA Seminar Series
Date: Tuesday, 30 June, 12:30 CEST
Place: Salón de Actos
The Occultation Portal: A Distributed Platform for Stellar Occultations
The Occultation Portal (OP) is a scientific infrastructure originally developed within the ERC Lucky Star collaboration to support the coordination, archiving, and analysis of stellar occultation campaigns. It now provides the wider community with coordinated access to predictions, datasets, and analysis tools, and supports several international programmes, including our efforts at IAA–CSIC on trans-Neptunian objects and irregular satellites, for which occultations are essential to measure sizes, shapes, atmospheres, and ring systems. The Portal has recently been redesigned as a distributed system, combining centralized campaign coordination and data curation with dedicated analysis capabilities for resource-intensive workflows such as astrometric alignment, photometry, light-curve extraction, and limb fitting. This architecture is designed to scale to additional sites through secure data exchange and automated synchronisation between nodes. In the era of Gaia astrometry, DR3 and beyond, and the forthcoming LSST/Rubin survey — both driving a rapid increase in predictable stellar occultations — the OP is becoming an increasingly important data hub for the community. In this talk, I will introduce the Portal to the IAA community, present its new distributed architecture, and highlight the main scientific and technical developments behind it.
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SO Colloquium Series
Speaker: Danielaa Galárraga Espinosa, Kavli Institute for the Physics and Mathematics of the Universe (IPMU) - Tokyo, JapanDate: Thursday, 2 July, 12:30 CEST
Place: Salón de Actos
YouTube: https://www.youtube.com/@iaaudc
Date: Thursday, 2 July, 12:30 CEST
Place: Salón de Actos
Filaments: from the large-scale structure to the CGM
I will present a characterisation of filamentary structures at different scales, from the large-scale cosmic filaments forming the skeleton of the cosmic web, to the smaller-scale filaments playing a crucial role in the circum-galactic medium (CGM). Using the outputs of recent large-scale hydro-dynamical simulations, I will focus on some fundamental properties of filaments at z=0, and show how cosmic filaments evolved since z=4. In the second part of my talk, I will zoom into CGM scales to show how the smaller-scale filaments (or streams) influence the star-formation activity of galaxies, and present the latest observational detections using a combination of the miniJPAS and DESI datasets. I will conclude on the importance of understanding the multi-scale nature of the cosmic web and discuss prospects for observing filamentary structures with current and future multi-wavelength datasets.
I will present a characterisation of filamentary structures at different scales, from the large-scale cosmic filaments forming the skeleton of the cosmic web, to the smaller-scale filaments playing a crucial role in the circum-galactic medium (CGM). Using the outputs of recent large-scale hydro-dynamical simulations, I will focus on some fundamental properties of filaments at z=0, and show how cosmic filaments evolved since z=4. In the second part of my talk, I will zoom into CGM scales to show how the smaller-scale filaments (or streams) influence the star-formation activity of galaxies, and present the latest observational detections using a combination of the miniJPAS and DESI datasets. I will conclude on the importance of understanding the multi-scale nature of the cosmic web and discuss prospects for observing filamentary structures with current and future multi-wavelength datasets.