Formation of warped disks by galactic flyby encounters. I. stellar disks

Jeonghwan H. Kim, Sebastien Peirani, Sungsoo Kim, Hong Bae Ann, Sung Ho An, Suk Jin Yoon

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Warped disks are almost ubiquitous among spiral galaxies. Here we revisit and test the "flyby scenario" of warp formation, in which impulsive encounters between galaxies are responsible for warped disks. Based on N-body simulations, we investigate the morphological and kinematical evolution of the stellar component of disks when galaxies undergo flyby interactions with adjacent dark matter halos. We find that the so-called "S"-shaped warps can be excited by flybys and sustained for even up to a few billion years, and that this scenario provides a cohesive explanation for several key observations. We show that disk warp properties are governed primarily by the following three parameters: (1) the impact parameter, i.e., the minimum distance between two halos; (2) the mass ratio between two halos; and (3) the incident angle of the flyby perturber. The warp angle is tied up with all three parameters, yet the warp lifetime is particularly sensitive to the incident angle of the perturber. Interestingly, the modeled S-shaped warps are often non-symmetric depending on the incident angle. We speculate that the puzzling U- and L-shaped warps are geometrically superimposed S-types produced by successive flybys with different incident angles, including multiple interactions with a satellite on a highly elongated orbit.

Original languageEnglish
Article number90
JournalAstrophysical Journal
Volume789
Issue number1
DOIs
Publication statusPublished - 2014 Jul 1

Fingerprint

encounters
halos
disk galaxies
spiral galaxies
mass ratios
dark matter
simulation
parameter
interactions
galaxies
orbits
life (durability)
test

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kim, Jeonghwan H. ; Peirani, Sebastien ; Kim, Sungsoo ; Ann, Hong Bae ; An, Sung Ho ; Yoon, Suk Jin. / Formation of warped disks by galactic flyby encounters. I. stellar disks. In: Astrophysical Journal. 2014 ; Vol. 789, No. 1.
@article{59af2593fff7499f821f1ae3d0b6e0c3,
title = "Formation of warped disks by galactic flyby encounters. I. stellar disks",
abstract = "Warped disks are almost ubiquitous among spiral galaxies. Here we revisit and test the {"}flyby scenario{"} of warp formation, in which impulsive encounters between galaxies are responsible for warped disks. Based on N-body simulations, we investigate the morphological and kinematical evolution of the stellar component of disks when galaxies undergo flyby interactions with adjacent dark matter halos. We find that the so-called {"}S{"}-shaped warps can be excited by flybys and sustained for even up to a few billion years, and that this scenario provides a cohesive explanation for several key observations. We show that disk warp properties are governed primarily by the following three parameters: (1) the impact parameter, i.e., the minimum distance between two halos; (2) the mass ratio between two halos; and (3) the incident angle of the flyby perturber. The warp angle is tied up with all three parameters, yet the warp lifetime is particularly sensitive to the incident angle of the perturber. Interestingly, the modeled S-shaped warps are often non-symmetric depending on the incident angle. We speculate that the puzzling U- and L-shaped warps are geometrically superimposed S-types produced by successive flybys with different incident angles, including multiple interactions with a satellite on a highly elongated orbit.",
author = "Kim, {Jeonghwan H.} and Sebastien Peirani and Sungsoo Kim and Ann, {Hong Bae} and An, {Sung Ho} and Yoon, {Suk Jin}",
year = "2014",
month = "7",
day = "1",
doi = "10.1088/0004-637X/789/1/90",
language = "English",
volume = "789",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

Formation of warped disks by galactic flyby encounters. I. stellar disks. / Kim, Jeonghwan H.; Peirani, Sebastien; Kim, Sungsoo; Ann, Hong Bae; An, Sung Ho; Yoon, Suk Jin.

In: Astrophysical Journal, Vol. 789, No. 1, 90, 01.07.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Formation of warped disks by galactic flyby encounters. I. stellar disks

AU - Kim, Jeonghwan H.

AU - Peirani, Sebastien

AU - Kim, Sungsoo

AU - Ann, Hong Bae

AU - An, Sung Ho

AU - Yoon, Suk Jin

PY - 2014/7/1

Y1 - 2014/7/1

N2 - Warped disks are almost ubiquitous among spiral galaxies. Here we revisit and test the "flyby scenario" of warp formation, in which impulsive encounters between galaxies are responsible for warped disks. Based on N-body simulations, we investigate the morphological and kinematical evolution of the stellar component of disks when galaxies undergo flyby interactions with adjacent dark matter halos. We find that the so-called "S"-shaped warps can be excited by flybys and sustained for even up to a few billion years, and that this scenario provides a cohesive explanation for several key observations. We show that disk warp properties are governed primarily by the following three parameters: (1) the impact parameter, i.e., the minimum distance between two halos; (2) the mass ratio between two halos; and (3) the incident angle of the flyby perturber. The warp angle is tied up with all three parameters, yet the warp lifetime is particularly sensitive to the incident angle of the perturber. Interestingly, the modeled S-shaped warps are often non-symmetric depending on the incident angle. We speculate that the puzzling U- and L-shaped warps are geometrically superimposed S-types produced by successive flybys with different incident angles, including multiple interactions with a satellite on a highly elongated orbit.

AB - Warped disks are almost ubiquitous among spiral galaxies. Here we revisit and test the "flyby scenario" of warp formation, in which impulsive encounters between galaxies are responsible for warped disks. Based on N-body simulations, we investigate the morphological and kinematical evolution of the stellar component of disks when galaxies undergo flyby interactions with adjacent dark matter halos. We find that the so-called "S"-shaped warps can be excited by flybys and sustained for even up to a few billion years, and that this scenario provides a cohesive explanation for several key observations. We show that disk warp properties are governed primarily by the following three parameters: (1) the impact parameter, i.e., the minimum distance between two halos; (2) the mass ratio between two halos; and (3) the incident angle of the flyby perturber. The warp angle is tied up with all three parameters, yet the warp lifetime is particularly sensitive to the incident angle of the perturber. Interestingly, the modeled S-shaped warps are often non-symmetric depending on the incident angle. We speculate that the puzzling U- and L-shaped warps are geometrically superimposed S-types produced by successive flybys with different incident angles, including multiple interactions with a satellite on a highly elongated orbit.

UR - http://www.scopus.com/inward/record.url?scp=84902594630&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84902594630&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/789/1/90

DO - 10.1088/0004-637X/789/1/90

M3 - Article

AN - SCOPUS:84902594630

VL - 789

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 90

ER -