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- W2032654782 abstract "We constructed the composite luminosity function (LF) of clusters of galaxies in the five SDSS photometric bands u , g , r , i and z from the RASS-SDSS galaxy cluster catalog. Background and foreground galaxies are subtracted using both a local and a global background correction to take in account the presence of large scale structures and field to field variations, respectively. The composite LF clearly shows two components: a bright-end LF with a classical slope of –1.25 in each photometric band, and a steeper faint-end LF ($-2.1 le alpha le -1.6$) in the dwarf galaxy region. The observed upturn of the faint galaxies has a location ranging from $-16 +5log(h)$ in the g band to $-18.5 +5log(h)$ in the z band. To study the universality of the cluster LF we compare the individual cluster LFs with the composite luminosity function. In agreement with the composite LF, a single Schechter component is not a good fit for the majority of the clusters. We fit a Schechter function to the bright-end of the individual cluster LFs in the magnitude region brighter than the observed upturn of the dwarf galaxies. The bright-end of the galaxy clusters shows the same shape in all the systems. To study the behavior of the individual faint-end LF we define the Dwarf to Giant galaxy Ratio (DGR) of the single clusters. The distribution of DGR has a spread much larger than the statistical errors. The DGR clearly anti-correlates with both X-ray and optical cluster luminosities. This anti-correlation is most likely due to the choice of a fixed metric aperture for all the clusters. Therefore, because of this effect, the different cluster physical sizes must be taken into account before comparing the LF of different clusters." @default.
- W2032654782 created "2016-06-24" @default.
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- W2032654782 date "2005-04-01" @default.
- W2032654782 modified "2023-09-23" @default.
- W2032654782 title "RASS-SDSS galaxy cluster survey. II. A unified picture of the cluster luminosity function" @default.
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