TODAY: [IPARCOS astro-seminar] March 20th 2026 @10:00 (CET) - "New HR-pyPopStar synthesis models: studying dwarf galaxy properties", Dr. Iker Millan Irigoyen (MPIA, Germany)

[ARMANDO GIL DE PAZ]

Iker Millan Irigoyen, MPIA

New HR-pyPopStar synthesis models: studying dwarf galaxy properties 

Low-metallicity stellar populations are numerous in the Universe. Either as the remnants of the past history of the Milky Way and similar spiral galaxies or the young low-metallicity stellar populations that are being observed in the local dwarf galaxies or at high-z galaxies recently found with JWST. In order to study those special environments, we developed new high-spectral-resolution models tailored for low-metallicity environments using the state-of-the-art stellar population synthesis code HR-PYPOPSTAR with up-to-date stellar libraries.  We compared the new spectral energy distributions with the previous models of HR-PYPOPSTAR for solar metallicity and with other stellar population synthesis models. We found agreement between all the models in the optical but found several differences between the models in the NIR molecular bands. These intrinsic differences can substantially affect the age, metallicity and mass estimates derived from restframe NIR data, such as those obtained with VLT, JWST. Finally, we analysed a sub-sample of dwarf galaxies from the MaNGA survey and we found that star-forming dwarf galaxies have higher stellar mass - mean stellar metallicity relation than the average dwarf galaxies. These results suggest that dwarf galaxies are very sensitive to sudden changes in the Star Formation History.

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The talk will take place both in person at Room 13 (Ground floor) of Facultad de CC. Físicas (UCM) and online (Zoom and Youtube live).

The link to join the zoom is the following: https://rediris.zoom.us/

The IPARCOS astro-seminars on Youtube: click here

Full list of the IPARCOS astro seminars and colloquia: here

Armando Gil de Paz

Responsable de la Unidad LICA del CAI de Técnicas Físicas (catálogo de CAIs)

Departamento de Física de la Tierra y Astrofísica & Instituto de Física de Partículas y del Cosmos
Facultad Ciencias Físicas

Universidad Complutense de Madrid

Plaza Ciencias, 1, E-28040 Madrid, Spain 

Phone/Fax: +34 91 3945179/4635

ag...@fis.ucm.es

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