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Exploring the origin of ultra-diffuse galaxies in clusters from their primordial alignment

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Abstract
We find that the minor axes of the ultra-diffuse galaxies (UDGs) in Abell 2634 tend to be aligned with the major axis of the central dominant galaxy, at a greater than or similar to 95 per cent confidence level. This alignment is produced by the bright UDGs with the absolute magnitudes M-r < -15.3 mag, and outer-region UDGs with R > 0.5R(200). The alignment signal implies that these bright, outer-region UDGs are very likely to acquire their angular momenta from the vortices around the large-scale filament before they were accreted into A2634, and form their extended stellar bodies outside of the cluster; in this scenario, the orientations of their primordial angular momenta, which are roughly shown by their minor axes on the images, should tend to be parallel to the elongation of the large-scale filament. When these UDGs fell into the unrelaxed cluster A2634 along the filament, they could still preserve their primordial alignment signal before violent relaxation and encounters. These bright, outer-region UDGs in A2634 are very unlikely to be the descendants of the high-surface-brightness dwarf progenitors under tidal interactions with the central dominant galaxy in the cluster environment. Our results indicate that the primordial alignment could be a useful probe of the origin of UDGs in large-scale structures.
Keywords
galaxies: clusters: individual (A2634), galaxies: kinematics and dynamics, galaxies: statistics, galaxies: structure, Astrophysics - Astrophysics of Galaxies, DARK-MATTER, ELLIPTIC GALAXIES, RADIAL ALIGNMENT, SPIN, KINEMATICS, DYNAMICS, HALOES, FIELD

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MLA
Rong, Yu, et al. “Exploring the Origin of Ultra-Diffuse Galaxies in Clusters from Their Primordial Alignment.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 498, no. 1, 2020, pp. L72–76, doi:10.1093/mnrasl/slaa129.
APA
Rong, Y., Mancera Piña, P. E., Tempel, E., Puzia, T. H., & De Rijcke, S. (2020). Exploring the origin of ultra-diffuse galaxies in clusters from their primordial alignment. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 498(1), L72–L76. https://doi.org/10.1093/mnrasl/slaa129
Chicago author-date
Rong, Yu, Pavel E. Mancera Piña, Elmo Tempel, Thomas H. Puzia, and Sven De Rijcke. 2020. “Exploring the Origin of Ultra-Diffuse Galaxies in Clusters from Their Primordial Alignment.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 498 (1): L72–76. https://doi.org/10.1093/mnrasl/slaa129.
Chicago author-date (all authors)
Rong, Yu, Pavel E. Mancera Piña, Elmo Tempel, Thomas H. Puzia, and Sven De Rijcke. 2020. “Exploring the Origin of Ultra-Diffuse Galaxies in Clusters from Their Primordial Alignment.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 498 (1): L72–L76. doi:10.1093/mnrasl/slaa129.
Vancouver
1.
Rong Y, Mancera Piña PE, Tempel E, Puzia TH, De Rijcke S. Exploring the origin of ultra-diffuse galaxies in clusters from their primordial alignment. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2020;498(1):L72–6.
IEEE
[1]
Y. Rong, P. E. Mancera Piña, E. Tempel, T. H. Puzia, and S. De Rijcke, “Exploring the origin of ultra-diffuse galaxies in clusters from their primordial alignment,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 498, no. 1, pp. L72–L76, 2020.
@article{8687663,
  abstract     = {{We find that the minor axes of the ultra-diffuse galaxies (UDGs) in Abell 2634 tend to be aligned with the major axis of the central dominant galaxy, at a greater than or similar to 95 per cent confidence level. This alignment is produced by the bright UDGs with the absolute magnitudes M-r < -15.3 mag, and outer-region UDGs with R > 0.5R(200). The alignment signal implies that these bright, outer-region UDGs are very likely to acquire their angular momenta from the vortices around the large-scale filament before they were accreted into A2634, and form their extended stellar bodies outside of the cluster; in this scenario, the orientations of their primordial angular momenta, which are roughly shown by their minor axes on the images, should tend to be parallel to the elongation of the large-scale filament. When these UDGs fell into the unrelaxed cluster A2634 along the filament, they could still preserve their primordial alignment signal before violent relaxation and encounters. These bright, outer-region UDGs in A2634 are very unlikely to be the descendants of the high-surface-brightness dwarf progenitors under tidal interactions with the central dominant galaxy in the cluster environment. Our results indicate that the primordial alignment could be a useful probe of the origin of UDGs in large-scale structures.}},
  author       = {{Rong, Yu and Mancera Piña, Pavel E. and Tempel, Elmo and Puzia, Thomas H. and De Rijcke, Sven}},
  issn         = {{0035-8711}},
  journal      = {{MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY}},
  keywords     = {{galaxies: clusters: individual (A2634),galaxies: kinematics and dynamics,galaxies: statistics,galaxies: structure,Astrophysics - Astrophysics of Galaxies,DARK-MATTER,ELLIPTIC GALAXIES,RADIAL ALIGNMENT,SPIN,KINEMATICS,DYNAMICS,HALOES,FIELD}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{L72--L76}},
  title        = {{Exploring the origin of ultra-diffuse galaxies in clusters from their primordial alignment}},
  url          = {{http://dx.doi.org/10.1093/mnrasl/slaa129}},
  volume       = {{498}},
  year         = {{2020}},
}

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