Thursday.
1409.6727
Near-infrared structure of fast and slow rotating disk galaxies
Schechtman-Rook, Bershady
Despite the differences within, all fast-rotating galaxies in the sample (of edge-on galaxies) have inner truncations in at least one of their disks (super-thin, think, thick). These truncations lead to Freeman Type II profiles when projected face-on. Slow-rotating galaxies are less complex, lacking inner disk truncations and require fewer disk components to reproduce their light distributions. Super-think disk components in undisturbed disks contribute ~25% of the total Ks-band light, up to that of the thin-disk contribution. The presence of super-thin disks correlates with IR flux ratios; galaxies with super-thin disks have f(Ks)/f(60 um)<0.12 for integrated light, consistent with super-thin disks being regions of on-going SF. Attenuation-corrected vertical color gradients in (J-Ks) correlate with the observed disk structure and are consistent with population gradients with young-to-intermediate ages closer to the mid plane, indicating that disk heating (or cooling) is a ubiquitous phenomenon.
No comments:
Post a Comment