TY  - JOUR
AU  - Zhu, Qirong
AU  - Pérez-Montaño, Luis Enrique
AU  - Rodriguez-Gomez, Vicente
AU  - Cervantes Sodi, Bernardo
AU  - Zjupa, Jolanta
AU  - Marinacci, Federico
AU  - Vogelsberger, Mark
AU  - Hernquist, Lars
TI  - Giant low surface brightness galaxies in TNG100
JO  - Monthly notices of the Royal Astronomical Society
VL  - 523
IS  - 3
SN  - 0035-8711
CY  - Oxford
PB  - Oxford Univ. Press
M1  - FZJ-2024-00266
SP  - 3991 - 4014
PY  - 2023
AB  - Giant low surface brightness (GLSB) galaxies, such as Malin 1 and UGC 1382, contain the largest stellar discs known. GLSB galaxies also often contain large masses of neutral hydrogen (H I). However, these extreme galaxies' origin and properties remain poorly understood. Using the cosmological simulation IllustrisTNG 100, we identify and select a sample of ~200 galaxies with extended (RHI>50 kpc) and well-defined H I discs, ~6 per cent of the total galaxies in the same stellar mass range (10.2 < log (M*/M⊙) < 11.6). This GLSB sample is heterogeneous, with mixed galaxy morphologies ranging from the most disc-dominated systems to massive ellipticals. These simulated GLSB galaxies are located in massive haloes (Vmax>150 km s−1) and their properties, such as total H I content, stellar disc parameters, star formation rate, and rotation curves, agree with observed GLSB galaxies. We construct a paired control sample to contrast with the GLSB galaxies. The GLSB galaxies tend to have large galaxy spin parameters (40 per cent larger) and larger ex situ stellar mass fractions than the paired control. We find evidence that aligned mergers promote the formation of extended discs and that isolated environments help the survival of those discs across cosmic time.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001011067600017
DO  - DOI:10.1093/mnras/stad1655
UR  - https://juser.fz-juelich.de/record/1020571
ER  -