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23 April 2024 |
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The Kinematically Measured Pattern Speeds of NGC 2523 and NGC 4245 | | P. Treuthardt
; R. Buta
; H. Salo
; E. Laurikainen
; | | Date: |
26 Jun 2007 | | Abstract: | We have applied the Tremaine-Weinberg continuity equation method to derive
the bar pattern speed in the SB(r)b galaxy NGC 2523 and the SB(r)0/a galaxy NGC
4245 using the Calcium Triplet absorption lines. These galaxies were selected
because they have strong inner rings which can be used as independent tracers
of the pattern speed. The pattern speed of NGC 2523 is 26.4 $pm$ 6.1 km
s$^{-1}$ kpc$^{-1}$, assuming an inclination of 49.7$^{circ}$ and a distance
of 51.0 Mpc. The pattern speed of NGC 4245 is 75.5 $pm$ 31.3 km s$^{-1}$
kpc$^{-1}$, assuming an inclination of 35.4$^{circ}$ and a distance of 12.6
Mpc. The ratio of the corotation radius to the bar radius of NGC 2523 and NGC
4245 is 1.4 $pm$ 0.3 and 1.1 $pm$ 0.5, respectively. These values place the
bright inner rings near and slightly inside the corotation radius, as predicted
by barred galaxy theory. Within the uncertainties, both galaxies are found to
have fast bars that likely indicate dark halos of low central concentration.
The photometric properties, bar strengths, and disk stabilities of both
galaxies are also discussed. | | Source: | arXiv, arxiv.0706.3871 | | Services: | Forum | Review | PDF | Favorites | |
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