Pristine Inner Galaxy Survey (PIGS) IX. The largest detailed chemical analysis of very metal-poor stars in the Sagittarius dwarf galaxy This paper is the result of a collaboration between ERIS and Pristine. Sara Vitali, one of our PhD students, came to Chile because she wants to see how with phylogenetic techniques we can learn about […]
There is still no model to infere phylogeny of galaxy evolution. We are developing such a method, by considering the rates of metal production by supernova and stellar winds based on gas density and star formation histories and comparing this method to chemical data.
L5: Development of Phylogenetic Methods for Astronomy Read More »
This line aims at merging the astronomical lines on chemical abundance determination and galaxy evolution modeling by building and analyzing trees and networks. Here is where the key idea of ERIS to apply the principles and methods of phylogenetics to the evolution of galaxies happens. Currently, the well-known distance method known as “Neighbor Joining” clustering
L4: Intersection of Disciplines Read More »
To understand the impact on phylogenetic trees regarding the role of the various chemicalelements, semi-analytical models of chemical evolution are analyzed. These models includeFlex-CE or L-Galaxies, which take into account the non-linear evolution of a structure in acosmological framework and introduce the physics of baryons by using a set of recipeswhose free parameters are chosen
L3: Chemical Evolution Modeling Read More »
This research line aims to use computational simulations of galaxy evolution (such as [Patricia’s simulation] and L-Galaxies) to study the physical processes that occur throughout the life of galaxies, particularly focusing on the Milky Way. We are particularly interested in the chemical evolution of baryons as galaxies form, including enrichment processes from Type Ia &
L2: Cosmological Galaxy Formation Simulations Read More »
We develop methods to determine chemical composition in stars. ERIS attributes the chemical abundances imprinted in stellar atmospheres as the heritable marker for the phylogenetic signal of galaxy evolution. The problem of determining stellar atmospheric parameters (effective temperature, surface gravity, overall metallicity, etc), and subsequently determining individual chemical abundances, is complex. Despite the rapid development
L1: Stellar Spectral Analysis Read More »
To finish the year, In December 2022, ERIS members managed to meet in the last country where we’re based: Australia. We had the chance to mingle and work! Paula Jofre, the ERIS director, travelled as part of the “Mt. Stromlo Distinguished visitor programme”, which invites researchers from abroad to visit the Australian National University (ANU).
The Núcleo Milenio ERIS, together with the European Southern Observatory (ESO) hosted a workshop entitled “Extending the Gaia Benchmark stars” throughout November. From the 14th until the 18th of the last month and thanks to the collaboration between Ditte Slumstrup and Paula Jofré, it was possible to bring together a team of experts to work
Workshop Gaia Benchmark stars Read More »
The Co-director of the ERIS Millennium Nucleus and astrophysicist, Patricia Tissera, was announced during the month of August with the award of the Charreau Prize. This award was created in 2020, with the dual purpose of paying tribute to a notable figure in Ibero-American science and rewarding the scientific production and cooperation of researchers in
Charreau Award for Patricia Tissera Read More »
Gaia is a space observatory launched by the European Space Agency (ESA) whose mission is to create a detailed map of the Milky Way, revealing secrets of the birth, structure and evolution of it, as well as some aspects of the inner workings of the stars. Gaia has as its goal to capture information from
The benefits and link of Gaia inside ERIS Read More »
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