Apparent Brightness » high z

Monolithic or hierarchical star formation? A new statistical analysis

Thomas Marquart — Mon, 03 Dec 2007 15:35:59 +0000

Kampakoglou et al.
http://arxiv.org/abs/0709.1104
Statistical model to predict/fit the star formation history of the universe. Hierarchical formation through merging seems to be favoured but not enough to exclude the monolithic scenario. Outflow models and dust are critical.

My impression is that the two priciple modes of galaxy formation seem to be subject to fashion among astronomers. While monolithic has been favoured in the early days of extragalacitc astronomy, the hierarchical formation was preferred until lately when it was realised that the former probably also plays a role.

The Polarization of Scattered Lyman Alpha Radiation Around High-Redshift Galaxies

Thomas Marquart — Tue, 20 Nov 2007 13:32:25 +0000

Dijkstra et al.
http://arxiv.org/abs/0711.2312
numerical study of how LyA photons scatter and become polarizes
difference for infall and outflow of gas
polarimetric measurements proposed

IMAGES I. Strong evolution of galaxy kinematics since z=1

Thomas Marquart — Tue, 20 Nov 2007 13:29:15 +0000

Yang et al.
http://arxiv.org/abs/0711.2305
large project with the IFU-mode of FLAMES at the VLT.
z=1 galaxies show more frequently “strange” kinematics than locally.

Integral-field spectroscopy of a Lyman-Break Galaxy at z=3.2: evidence for merging

Thomas Marquart — Mon, 12 Nov 2007 19:40:43 +0000

Nesvadba et al.
http://arxiv.org/abs/0711.1491
the title says it.
two blobs rotating around each other without velocity difference over each of them.
similar to UM461? but bigger.

A Population of Massive and Evolved Galaxies at z >5

Thomas Marquart — Wed, 31 Oct 2007 14:00:19 +0000

Wiklind et al.
http://arxiv.org/abs/0710.0406
early red and dead galaxies that formed their stars at z >9