Sepideh Eskandarlou
Centro de Estudios de Física del Cosmos de Aragón
Abstract
Galaxies interact with their environment, leading to morphological transformation. These interactions may leave gas and low surface brightness tidal features on their outskirts. Studying these remnants can enhance our understanding of non-linear structure formation in galaxy evolution, the properties of progenitor stellar populations, AGN activity, star formation, and gas inflows and outflows.
Until now, these remnants were studied with broad-band filters, as their diffuse structures require prohibitively long exposure times for spectroscopy, and in the nearby universe, they are too large for the field of view of Integral Field Units (IFUs). With the 56 narrow-bands of J-PAS filters, we can study them for the first time, at unprecedented spectral resolution. In this project, we investigate the photometric properties, stellar populations and gas (emission lines) of the complex environmet of PGC 3087775 (which we dub as Alba). The spectral energy distribution (SED) of the tidal features were measured both in manually drawn polygons and an automatic tessellation over the fully detected region of the tidal features and galaxy. To validate J-PAS, a MaNGA data cube, observed in the central region of the galaxy, is used. J-PAS reaches a continuum 3σ surface brightness limit (over 100 arcsec2 at 7000Å) of 26.57 mag/arcsec2 or 5.2×10−20 erg/s/cm2 /Å/arcsec2 . The J-PAS SED matches very well with MaNGA in the central part, highlighting J-PAS’s impressive spectrometric capabilities. The SED of the remnants reveal an old stellar population (with visible Balmer break). We also discovered a bimodal OIII emission (separated by 53Kpc) around the central merging galaxy, which was unexpected in such a disturbed halo.
2024 December 09, 13:30
IA/U.Porto
Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto
