The SAMI Galaxy Survey: Kinematic Alignments of Early-type Galaxies in A119 and A168

We investigate the kinematic alignments of luminous early-type galaxies (Mr ≤ −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...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2019-04, Vol.875 (1), p.60
Main Authors: Jeong, Hyunjin, Kim, Suk, Owers, Matt S., Joo, Seok-Joo, Kim, Hak-Sub, Lee, Woong, Lee, Youngdae, Sande, Jesse van de, 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
Language:English
Subjects:
Alignment
Astrophysics
Filaments
Galactic clusters
Galaxies
galaxies: clusters: individual (A119 and A168)
galaxies: evolution
galaxies: formation
galaxies: kinematics and dynamics
Integrals
Kinematics
Polls & surveys
Stars & galaxies
Virgo galactic cluster
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We investigate the kinematic alignments of luminous early-type galaxies (Mr ≤ −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 ATLAS3D 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.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab0d90