Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-12
Astrophys.J. 622 (2005) L17-L20
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, to appear in ApJL accepted version
Scientific paper
10.1086/429561
We explore the X-ray properties of a subset of the optically selected SDSS cluster sample of Goto et al. (2002), by analysing seven public XMM-{\em Newton} pointings, with exposure times ranging from $\sim$ 4 to 46 ksec. There are in total 17 SDSS clusters out of which only eight are detected at X-ray wavelengths with $\rm f_{0.5-2keV}\magcir 1.2 \times 10^{-14}$ ergs cm$^{-2}$ s$^{-1}$. For the remaining 9 SDSS clusters we estimate their 3$\sigma$ luminosity upper limits (corresponding to $L_x\mincir 5\times 10^{42}$ ergs/sec in the 0.5-2 keV band). This relatively low luminosity suggests that if real structures, these galaxy aggregations correspond to poor groups of galaxies. Using the SDSS photometric catalogue we also derive the cluster optical $r$-band luminosities. The resulting scaling relations ($L_{\rm opt}-L_x$, $L_{\rm opt}-T_x$) are consistent with those of other recent studies.
Basilakos Spyros
Georgakakis Antonis
Georgantopoulos Ioannis
Plionis Manolis
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