The 2dF Galaxy Redshift Survey: correlation with the ROSAT-ESO flux-limited X-ray galaxy cluster survey

Hilton, M.; Collins, C.; De Propris, R.; Baldry, I.K.; Baugh, C.M.; Bland-Hawthorn, J.; Bridges, T.; Cannon, R.; Cole, S.; Colless, M.; Couch, W.J.; Dalton, G.B.; Driver, S.P.; Efstathiou, G.; Ellis, R.S.; Frenk, C.S.; Glazebrook, K.; Jackson, C.A.; Lahav, O.; Lewis, I.; Lumsden, S.; Maddox, S.J.; Madgwick, D.; Norberg, P.; Peacock, J.A.; Peterson, B.A.; Sutherland, W.; Taylor, K.

Abstract

The ROSAT-European Southern Observatory (ESO) flux-limited X-ray (REFLEX) galaxy cluster survey and the Two-degree Field Galaxy Redshift Survey (2dFGRS), respectively, comprise the largest, homogeneous X-ray selected cluster catalogue and completed galaxy redshift survey. In this work, we combine these two outstanding data sets in order to study the effect of the large-scale cluster environment, as traced by X-ray luminosity, on the properties of the cluster member galaxies. We measure the LX−σr relation from the correlated data set and find it to be consistent with recent results found in the literature. Using a sample of 19 clusters with LX≥ 0.36 × 1044 erg s−1 in the 0.1–2.4 keV band, and 49 clusters with lower X-ray luminosity, we find that the fraction of early spectral type (η=−1.4), passively evolving galaxies is significantly higher in the high-LX sample within R200. We extend the investigation to include composite bJ cluster luminosity functions, and find that the characteristic magnitude of the Schechter-function fit to the early-type luminosity function is fainter for the high-LX sample compared to the low-LX sample (ΔM*= 0.58 ± 0.14). This seems to be driven by a deficit of such galaxies with MbJ∼−21. In contrast, we find no significant differences between the luminosity functions of star-forming, late-type galaxies. We believe these results are consistent with a scenario in which the high-LX clusters are more dynamically evolved systems than the low-LX clusters.

Citation

Hilton, M., Collins, C., De Propris, R., Baldry, I., Baugh, C., Bland-Hawthorn, J., …Taylor, K. (2005). The 2dF Galaxy Redshift Survey: correlation with the ROSAT-ESO flux-limited X-ray galaxy cluster survey. Monthly Notices of the Royal Astronomical Society, 363(2), 661-674. https://doi.org/10.1111/j.1365-2966.2005.09470.x

• Journal Article Type: Article
• Publication Date: Oct 21, 2005
• Deposit Date: Aug 15, 2016
• Publicly Available Date: Aug 15, 2016
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 363
• Issue: 2
• Pages: 661-674
• DOI: https://doi.org/10.1111/j.1365-2966.2005.09470.x
• Keywords: galaxies : evolution; galaxies : luminosity function; mass function; cosmology : observations; X-rays : galaxies : clustersDIGITAL SKY SURVEY; K-BAND PROPERTIES; LUMINOSITY FUNCTION; STAR-FORMATION; VELOCITY DISPERSION; SPIRAL GALAXIES; RICH CLUSTERS; EVO
• Public URL: https://durham-repository.worktribe.com/output/1542335