Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-06
PoS BDMH2004 (2004) 005
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures. To appear in the Proceedings of Science (published by SISSA), Conference "Baryons in Dark Matter Haloes",
Scientific paper
We have performed intermediate-resolution VLT/FORS spectroscopy and HST/ACS imaging of 129 field spiral galaxies within the FORS Deep Field. The galaxies cover the redshift range 0.1 < z < 1.0 and comprise all types from Sa to Sdm/Im. Spatially resolved rotation curves were extracted and fitted with synthetic velocity fields that take into account all geometric (e.g., inclination and misalignment) and observational effects (in particular, blurring due to optical beam smearing and seeing). Using these fits, the maximum rotation velocity Vmax could be determined for 73 objects. The Tully-Fisher relation of this sample at a mean look-back time of ~5Gyr shows a luminosity evolution which amounts to ~2mag in rest-frame B for low-mass spirals (Vmax~100km/s) but is negligible for high-mass spirals (Vmax~300km/s). This confirms our previous analysis which was limited to ground-based imaging. The observed overluminosity of low-mass galaxies is at variance with predictions from simulations. On the other hand, at given Vmax, we find slightly smaller disk sizes towards higher redshifts, in compliance with the CDM hierarchical model. The observed mass-dependent luminosity evolution might therefore point towards the need for a more realistic modelling of the stellar (i.e. baryonic) component in N-body codes.
Boehm Asmus
Ziegler Bodo L.
No associations
LandOfFree
Disk galaxy evolution up to redshift z=1 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Disk galaxy evolution up to redshift z=1, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk galaxy evolution up to redshift z=1 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-40461