Mechanisms of the vertical secular heating of a stellar disk

N. Ya. Sotnikova, S. A. Rodionov

Результат исследований: Научные публикации в периодических изданияхстатья

20 Цитирования (Scopus)

Выдержка

We investigate the nonlinear growth stages of the bending instability in stellar disks with exponential radial density profiles. We found that the unstable modes are global (the wavelengths are larger than the disk scale lengths) and that the instability saturation level is much higher than that following from a linear criterion. The instability saturation time scales are of the order of one billion years or more. For this reason, the bending instability can play an important role in the secular heating of a stellar disk in the z direction. In an extensive series of numerical N-body simulations with a high spatial resolution, we were able to scan in detail the space of key parameters (the initial disk thickness z_0, the Toomre parameter Q, and the ratio of dark halo mass to disk mass M_h/M_d). We revealed three distinct mechanisms of disk heating in the z direction: bending instability of the entire disk, bending instability of the bar, and heating on vertical inhomogeneities in the distribution of stellar ma
Язык оригиналаанглийский
Страницы (с-по)321-335
ЖурналAstronomy Letters
Том29
Номер выпуска5
DOI
СостояниеОпубликовано - 2003
Опубликовано для внешнего пользованияДа

Отпечаток

heating
saturation
inhomogeneity
spatial resolution
halos
wavelength
timescale
high resolution
simulation
profiles
wavelengths
parameter

Цитировать

Sotnikova, N. Ya. ; Rodionov, S. A. / Mechanisms of the vertical secular heating of a stellar disk. В: Astronomy Letters. 2003 ; Том 29, № 5. стр. 321-335.
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Mechanisms of the vertical secular heating of a stellar disk. / Sotnikova, N. Ya.; Rodionov, S. A.

В: Astronomy Letters, Том 29, № 5, 2003, стр. 321-335.

Результат исследований: Научные публикации в периодических изданияхстатья

TY - JOUR

T1 - Mechanisms of the vertical secular heating of a stellar disk

AU - Sotnikova, N. Ya.

AU - Rodionov, S. A.

PY - 2003

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N2 - We investigate the nonlinear growth stages of the bending instability in stellar disks with exponential radial density profiles. We found that the unstable modes are global (the wavelengths are larger than the disk scale lengths) and that the instability saturation level is much higher than that following from a linear criterion. The instability saturation time scales are of the order of one billion years or more. For this reason, the bending instability can play an important role in the secular heating of a stellar disk in the z direction. In an extensive series of numerical N-body simulations with a high spatial resolution, we were able to scan in detail the space of key parameters (the initial disk thickness z_0, the Toomre parameter Q, and the ratio of dark halo mass to disk mass M_h/M_d). We revealed three distinct mechanisms of disk heating in the z direction: bending instability of the entire disk, bending instability of the bar, and heating on vertical inhomogeneities in the distribution of stellar ma

AB - We investigate the nonlinear growth stages of the bending instability in stellar disks with exponential radial density profiles. We found that the unstable modes are global (the wavelengths are larger than the disk scale lengths) and that the instability saturation level is much higher than that following from a linear criterion. The instability saturation time scales are of the order of one billion years or more. For this reason, the bending instability can play an important role in the secular heating of a stellar disk in the z direction. In an extensive series of numerical N-body simulations with a high spatial resolution, we were able to scan in detail the space of key parameters (the initial disk thickness z_0, the Toomre parameter Q, and the ratio of dark halo mass to disk mass M_h/M_d). We revealed three distinct mechanisms of disk heating in the z direction: bending instability of the entire disk, bending instability of the bar, and heating on vertical inhomogeneities in the distribution of stellar ma

KW - galaxies - groups and clusters of galaxies - intergalactic gas

U2 - 10.1134/1.1573281

DO - 10.1134/1.1573281

M3 - Article

VL - 29

SP - 321

EP - 335

JO - Astronomy Letters

JF - Astronomy Letters

SN - 1063-7737

IS - 5

ER -