A Shallow Dark Matter Halo in Ultra-diffuse Galaxy AGC 242019: Are UDGs Structurally Similar to Low-surface-brightness Galaxies?

Bibcode
2021ApJ...919L...1B
DOI
10.3847/2041-8213/ac236a
Brook, Chris B.; Di Cintio, Arianna; Macciò, Andrea V.; Blank, Marvin
Referencia bibliográfica

The Astrophysical Journal

Fecha de publicación:
9
2021
Revista
The Astrophysical Journal
Número de autores
4
Número de autores del IAC
2
Número de citas
9
Número de citas referidas
8
Descripción
A central question regarding ultra-diffuse galaxies (UDGs) is whether they are in a separate category from low-surface-brightness (LSB) galaxies, or just their natural continuation toward low stellar masses. In this Letter, we show that the rotation curve of the gas rich UDG AGC 242019 is well fit by a dark matter halo with an inner slope that asymptotes to ~-0.54, and that such a fit provides a concentration parameter that matches theoretical expectations. This finding, together with previous works in which shallow inner profiles are derived for UDGs, shows that the structural properties of these galaxies are like other observed LSBs. UDGs show slowly rising rotation curves and this favors formation scenarios in which internal processes, such as supernova-driven gas outflows, are acting to modify UDG profiles.
Proyectos relacionados
Project Image
Astrofísica Numérica: Formación y Evolución de Galaxias

Entre las cuestiones fundamentales en Astronomía y Astrofísica están la formación y evolución de galaxias. Las escalas de tiempo y tamaño son tan astronómicas que su observación en galaxias individuales es imposible. Solo con el uso de simulaciones numéricas es posible entender la formación de estructuras cósmicas dentro del actual marco

Claudio
Dalla Vecchia
En ejecución
Tipo
Con árbitro
Galaxias de bajo brillo superficial
Distribución de materia oscura
Densidad de materia oscura
Formación y Evolución de Galaxias (FYEG)

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