The SAMI Galaxy Survey:kinematic alignments of early-type galaxies in A119 and A168

We investigate the kinematic alignments of luminous early-type galaxies (M r ≤ -19.5 mag) in A119 and A168 using the kinematic position angles () from the Sydney-AAO Multi-object Integral-field spectrograph (SAMI) survey data, motivated by the implication of the galaxy spin alignment in a cosmologic...

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Bibliographic Details
Published in:The Astrophysical Journal
Main Authors: Jeong, Hyunjin, Kim, Suk, Owers, Matt S., Joo, Seo-Joo, Kim, Hak Sub, Lee, Woong, Lee, Youngdae, van de Sande, Jesse, Lee, Jaehyun, Yi, Sukyoung K., Croom, Scott M., Bryant, Julia J., Rey, Soo Chang, Brough, Sarah, Oh, Sree, Scott, Nicholas, Tonini, Chiara, Medling, Anne M., Sweet, Sarah M., Bland-Hawthorn, Joss, Konstantopoulos, Iraklis S., Lawrence, J. S., Richards, Samuel N.
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
galaxies: clusters: individual (A119 and A168)
galaxies: evolution
galaxies: formation
galaxies: kinematics and dynamics
sami
Online Access:https://researchers.mq.edu.au/en/publications/211ab6e6-3142-4437-9efb-66569d822609
https://doi.org/10.3847/1538-4357/ab0d90
http://www.scopus.com/inward/record.url?scp=85067177824&partnerID=8YFLogxK
http://purl.org/au-research/grants/arc/FT140100255
http://purl.org/au-research/grants/arc/CE170100013
Description
Summary:We investigate the kinematic alignments of luminous early-type galaxies (M r ≤ -19.5 mag) in A119 and A168 using the kinematic position angles () from the Sydney-AAO Multi-object Integral-field spectrograph (SAMI) survey data, motivated by the implication of the galaxy spin alignment in a cosmological context. To increase the size of our sample for statistical significance, we also use the photometric position angles () for galaxies that have not been observed by SAMI, if their ellipticities are higher than 0.15. Our luminous early-type galaxies tend to prefer the specific position angles in both clusters, confirming the results of Kim et al., who recently found the kinematic alignment of early-type galaxies in the Virgo cluster based on the ATLAS 3D integral-field spectroscopic data. This alignment signal is more prominent for galaxies in the projected phase-space regions dominated by infalling populations. Furthermore, the alignment angles are closely related to the directions of the filamentary structures around clusters. The results lead us to conclude that many cluster early-type galaxies are likely to be accreted along filaments while maintaining their spin axes, which are predetermined before cluster infall.

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