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astro-ph.GA2026

From blue to red spirals: Slow galaxy transformation via ram pressure stripping in TNG-50

V. Lora, J. I. Gonzalez-Carbajal, A. Pasquali +5

Late-type galaxies lose gas through ram-pressure stripping (RPS) after falling into a massive halo. Because this mechanism primarily removes the gaseous component while leaving the…

astro-ph.GA2026

The Twentieth Data Release of the Sloan Digital Sky Survey: First All-Sky BOSS Spectra, eROSITA-SDSS-V Mapper Coordinated Observations, and a Preview of the Local Volume Mapper

SDSS Collaboration, Mojgan Aghakhanloo, David Aguilar +273

The paper describes the twentieth data release (DR20) of the Sloan Digital Sky Survey, providing over 3 million new optical spectra from the SDSS‑V Milky Way, Black Hole, and Local…

astro-ph.GA2025

Isolated massive star candidates in NGC 4242 with GULP

Pietro Facchini, Eva K. Grebel, Anna Pasquali +16

There is considerable debate on how massive stars form, including whether a high-mass star must always form with a population of low-mass stars or whether it ca…

astro-ph.GA2025

The Nineteenth Data Release of the Sloan Digital Sky Survey

SDSS Collaboration, Gautham Adamane Pallathadka, Mojgan Aghakhanloo +209

Mapping the local and distant Universe is key to our understanding of it. For decades, the Sloan Digital Sky Survey (SDSS) has made a concerted effort to map millions of celestial…

astro-ph.GA2025

GULP II: Hierarchical Distribution and Evolution of Young Stellar Structures in NGC 4449

Beena Meena, Elena Sabbi, Peter Zeidler +15

We investigate the hierarchical distribution and evolution of young stellar structures in the dwarf starburst galaxy NGC 4449 using data from the GULP survey. By analyzing the spat…

astro-ph.GA2025

Stellar tidal streams around nearby spiral galaxies with deep imaging from amateur telescopes

David Martinez-Delgado, Michael Stein, Joanna D. Sakowska +26

Tidal interactions between massive galaxies and their satellites are fundamental processes in a Universe with L-Cold Dark Matter cosmology, redistributing material into faint featu…