Mon. Not. R. Astron. Soc., 461, 3222-3232 (2016/September-3)
SZ/X-ray scaling relations using X-ray data and Planck Nominal maps.
DE MARTINO I. and ATRIO-BARANDELA F.
Abstract (from CDS):
We determine the relation between the Comptonization parameter predicted using X-ray data Y_C, Xray_ and the X-ray luminosity LX, both magnitudes derived from ROSAT data, with the Comptonization parameter Y_C, SZ_ measured on Planck 2013 foreground cleaned Nominal maps. The 560 clusters of our sample includes clusters with masses M >= 1013 M☉, one order of magnitude smaller than those used by the Planck Collaboration in a similar analysis. It also contains eight times more clusters in the redshift interval z <= 0.3. The prediction of the β=2/3 model convolved with the Planck antenna beam agrees with the anisotropies measured in foreground cleaned Planck Nominal maps within the X-ray emitting region, confirming the results of an earlier analysis. The universal pressure profile overestimates the signal by a 15-21 per cent depending on the angular aperture. We show that the discrepancy is not due to the presence of cool-core systems but it is an indication of a brake in the LX - M relation towards low mass systems. We show that relation of the Comptonization parameter averaged over the region that emits 99 per cent of the X-ray flux and and the X-ray luminosity is consistent with the predictions of the self-similar model. We confirm previous findings that the scaling relations studied here do not evolve with redshift within the range probed by our catalogue.