Spatial distribution of ultra-diffuse galaxies within large-scale structures

Román-García, J.; Trujillo, I.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 468, Issue 1, p.703-716

Advertised on:
6
2017
Number of authors
2
IAC number of authors
2
Citations
124
Refereed citations
115
Description
Taking advantage of the Sloan Digital Sky Survey Stripe82 data, we have explored the spatial distribution of ultra-diffuse galaxies (UDGs) within an area of 8 × 8 Mpc2 centred around the galaxy cluster Abell 168 (z = 0.045). This intermediate massive cluster (σ = 550 km s-1) is surrounded by a complex large-scale structure. Our work confirms the presence of UDGs in the cluster and in the large-scale structure that surrounds it, and it is the first detection of UDGs outside clusters. Approximately 50 per cent of the UDGs analysed in the selected area inhabit the cluster region (∼11 ± 5 per cent in the core and ∼39 ± 9 per cent in the outskirts), whereas the remaining UDGs are found outside the main cluster structure (∼50 ± 11 per cent). The colours and the spatial distribution of the UDGs within this large-scale structure are more similar to dwarf galaxies than to L⋆ galaxies, suggesting that most UDGs could be bona fide dwarf galaxies.
Related projects
Group members
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology
We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.
Ignacio
Martín Navarro