Volume 480, Number 3, March IV 2008
|Page(s)||663 - 670|
|Published online||25 January 2008|
The galaxy luminosity function and its evolution with Chandra
Institute of Astronomy & Astrophysics, National Observatory of Athens, I. Metaxa & V. Pavlou, Penteli 152 36, Greece e-mail: firstname.lastname@example.org
Accepted: 1 September 2007
Aims.We have compiled one of the largest normal-galaxy samples ever to probe X-ray luminosity function evolution separately for early and late-type systems.
Methods.We selected 207 normal galaxies up to redshift , with data from four major Chandra X-ray surveys, namely the Chandra deep fields (north, south and extended) and XBootes, and a combination of X-ray and optical criteria. We used template spectral energy-distribution fitting to obtain separate early- and late-type sub-samples, made up of 101 and 106 systems, respectively. For the full sample, as well as the two sub-samples, we obtained luminosity functions using both a non-parametric and a parametric, maximum-likelihood method.
Results.For the full sample, the non-parametric method strongly suggests luminosity evolution with redshift. The maximum-likelihood estimate shows that this evolution follows , ± 0.3. For the late-type sub-sample, we obtained . We detected no significant evolution in the early-type sub-sample. The distributions of early and late-type systems with redshift show that late types dominate at and hence drive the observed evolution for the total sample.
Conclusions.Our results support previous results in X-ray and other wavebands, which suggests luminosity evolution with .
Key words: surveys / galaxies: luminosity function, mass function / X-rays: galaxies / X-rays: binaries
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.