Building CX peanut-shaped disk galaxy profiles

Box - and peanut - shaped bulges ⋆

We have observed 60 edge-on galaxies in the NIR in order to study the stellar distribution in galaxies with box/peanut-shaped bulges. The much smaller amount of dust extinction at these wavelengths allows us to identify in almost all target galaxies with box/peanut-shaped bulges an additional thin, central component in cuts parallel to the major axis. This structure can be identified with a bar...

The evolving disk galaxy population

In this contribution, I present a simplified overview of the evolution of the disk galaxy population since z = 1, and a brief discussion of a few open questions. Galaxy evolution surveys have found that the disk galaxy population forms stars intensely at intermediate redshift. In particular, they dominate the cosmic star formation rate at z < 1 — the factor of ten drop in cosmic average comovin...

Observations of Disk Galaxy Evolution

The morphologies of disk galaxies begin to deviate systematically from those of nearby galaxies at surprisingly low redshifts, possibly as low as z = 0.3. This corresponds to a time ∼ 3.5 Gyr in the past, which is only one quarter of the present age of the Universe. Beyond z = 0.5 (a look-back time of 5 Gyr) the effects of evolution on spiral structure are rather obvious: spiral arms are less w...

Spatially Varied Flow Profiles in a V-Shaped Side-Channel

Hopf Bifurcation in a Disk-shaped Nems

Self-sustained mechanical vibrations of a disc-type microfabricated resonator were experimentally observed when a continuous wave (CW) laser beam was focused on the periphery of the disc (for a 40 μm diameter resonator, natural frequency 0.89MHz, the laser power above a 250 W threshold was required). A theoretical model for self-oscillatory behavior has been developed based on FEM analysis of a...