Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-04-26
Mon. Not. Roy. Astron. Soc., 407, 1376-1386, 2010
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Typos corrected. Replaced to match published version. 12 pages, 12 figures. To appear in MNRAS
Scientific paper
In this work, we present results for the photometric and clustering properties of galaxies that arise in a LambdaCDM hydrodynamical simulation of the local universe. The present-day distribution of matter was constructed to match the observed large scale pattern of the IRAS 1.2-Jy galaxy survey. Our simulation follows the formation and evolution of galaxies in a cosmological sphere with a volume of ~130^3 (Mpc/h)^3 including supernova feedback, galactic winds, photoheating due to an uniform meta-galactic background and chemical enrichment of the gas and stellar populations. However, we do not consider AGNs. In the simulation, a total of ~20000 galaxies are formed above the resolution limit, and around 60 haloes are more massive than ~10^14 M_sun. Luminosities of the galaxies are calculated based on a stellar population synthesis model including the attenuation by dust, which is calculated from the cold gas left within the simulated galaxies. Environmental effects like colour bi-modality and differential clustering power of the hydrodynamical galaxies are qualitatively similar to observed trends. Nevertheless, the overcooling present in the simulations lead to too blue and overluminous brightest cluster galaxies (BCGs). To overcome this, we mimic the late-time suppression of star formation in massive halos by ignoring recently formed stars with the aid of a simple post-processing recipe. In this way we find luminosity functions, both for field and group/cluster galaxies, in better agreement with observations. Specifically, the BCGs then follow the observed luminosity-halo mass relation. However, in such a case, the colour bi-modality is basically lost, pointing towards a more complex interplay of late suppression of star formation than what is given by the simple scheme adopted.
Dolag Klaus
Nuza Sebastian E.
Saro Alexandro
No associations
LandOfFree
Photometric and clustering properties of hydrodynamical galaxies in a cosmological volume: results at z=0 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 Photometric and clustering properties of hydrodynamical galaxies in a cosmological volume: results at z=0, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photometric and clustering properties of hydrodynamical galaxies in a cosmological volume: results at z=0 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-236240