Ultra-diffuse galaxies outside clusters: clues to their formation and evolution

By J. Rom'an, Ignacio Trujillo. 2016

134 citations recorded by the source corpus.

We identify six ultra diffuse galaxies (UDGs) outside clusters in three nearby isolated groups (z 250 kpc) of our three groups, we identify a population of potential UDG progenitors (two of them confirmed spectroscopically). These progenitors have similar masses, shapes and sizes but are bluer, g-i~0.45, (and for this reason brighter, mu_g(0) 24 mag arcsec -2) UDGs after ~6 Gyr. If confirmed, our observations support a scenario where UDGs are old, extended, low surface brightness dwarfs (M*~10^8 Msun) galaxies born in the field, are later on processed in groups and, ultimately, infall into galaxy clusters by group accretion.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/cd8ee31017ff7ec844688166bcf4c83f65a4a103

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Citations in the corpus

(Almost) Dark Galaxies in the ALFALFA Survey: Isolated H i-bearing Ultra-diffuse Galaxies (2017, background): “Indeed, Román & Trujillo (2017b) recently estimate that 6 “progenitor” UDG sources on the edges of groups (with properties somewhat similar to the HUDS-B sample), might fade ∼1.5 mag arcsec−2 if they evolve passively for 6 Gyr.”
Illuminating Low Surface Brightness Galaxies with the Hyper Suprime-Cam Survey (2017, methodology): “Low-mass LSBGs typically have n ∼ 1 (e.g., Geha et al. 2006; Román & Trujillo 2017a).”