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The dependence of the cluster SFR on the cluster global properties
| Content Provider | Semantic Scholar |
|---|---|
| Author | Popesso, P. Biviano, Andrea Romaniello, Maria Boehringer, Hans |
| Copyright Year | 2006 |
| Abstract | To quantify the relationships between star formation in cluster galaxies and global cluster properties. Using a subsample of 79 nearby clusters from the RASS-SDSS galaxy cluster catalogue of Popesso et al. (2005a), we perform a regression analysis between the cluster integrated star formation rate (ΣSFR) the cluster total stellar mass (M⋆), the fractions of star forming (fSF ) and blue (fb) galaxies and other cluster global properties, namely its richness (Ngal, i.e. the total number of cluster members within the cluster virial radius, corrected for incompleteness), velocity dispersion (σv), virial mass (M200), and X-ray luminosity (LX). All cluster global quantities are corrected for projection effects before the analysis. Galaxy SFRs and stellar masses are taken from the catalog of Brinchmann et al. (2004), which is based on SDSS spectra. We only consider galaxies with Mr ≤ −20.25 in our analysis, and exclude AGNs. We find that both ΣSFR and M⋆ are correlated with all the cluster global quantities. A partial correlation analysis show that all the correlations are induced by the fundamental one between ΣSFR and Ngal, hence there is no evidence that the cluster properties affect the mean SFR or M⋆ per galaxy. The relations between ΣSFR and M⋆, on one side, and both Ngal and M200, on the other side, are linear, i.e. we see no evidence that different clusters have different SFR or different M⋆ per galaxy and per unit mass. The fraction fSF does not depend on any cluster property considered, while fb does depend on LX . We note that a significant fraction of star-forming cluster galaxies are red (∼ 25% of the whole cluster galaxy population). We conclude that the global cluster properties are unable to affect the SF properties of cluster galaxies, but the presence of the X-ray luminous intra-cluster medium can affect their colors, perhaps through the ram-pressure stripping mechanism. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0609080v2.pdf |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0609080v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Archive CCDC26 gene Cluster Headache Color Computer cluster Consortium Coupled cluster Database normalization Dependence Diagnostic radiologic examination Extraction FB Term Type GUCY2C protein, human Galaxy Hewlett-Packard 95LX LCN2 protein, human Luminous Studio M200 Marginal model Normalize Quantity Random-access memory Seventy Nine Spatial decision support system Stellar (payment network) Velocity (software development) |
| Content Type | Text |
| Resource Type | Article |
