The XMM Cluster Survey analysis of the SDSS DR8 redMaPPer catalogue: implications for scatter, selection bias, and isotropy in cluster scaling relations

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Giles, PA (Author) Other; Romer, AK (Author) Other; Wilkinson, R (Author) Other; Bermeo, A (Author) Other; Turner, DJ (Author) Other; Hilton, M (Author) Other; Upsdell, EW (Author) Other; Rooney, PJ (Author) Other; Bhargava, S (Author) Other; Ebrahimpour, L (Author) Other; Farahi, A (Author) Other; Mann, RG (Author) Other; Manolopoulou, M (Author) Other; Mayers, J (Author) Other; Vergara, C (Author) Other; viana, ptp (Author) FCUP; Collins, CA (Author) Other; Hollowood, D (Author) Other; Jeltema, T (Author) Other; Miller, CJ (Author) Other; Nichol, RC (Author) Other; Noorali, R (Author) Other; Splettstoesser, M (Author) Other; Stott, JP (Author) Other

Journal

Title: Monthly Notices of the Royal Astronomical Society

Vol. 516

Pages: 3878-3899

ISSN: 0035-8711

Publisher: Oxford University Press

Indexing

ISI Web of Knowledge - 3 Citations

Other information

Authenticus ID: P-00X-8QR

DOI: 10.1093/mnras/stac2414

Abstract (EN): In this paper, we present the X-ray analysis of Sloan Digital Sky Survey DR8 redMaPPer (SDSSRM) clusters using data products from the XMM Cluster Survey (XCS). In total, 1189 SDSSRM clusters fall within the XMM-Newton footprint. This has yielded 456 confirmed detections accompanied by X-ray luminosity (L-X) measurements. Of these clusters, 381 have an associated X-ray temperature measurement (T-X). This represents one of the largest samples of coherently derived cluster T-X values to date. Our analysis of the X-ray observable to richness scaling relations has demonstrated that scatter in the T-X-lambda relation is roughly a third of that in the L-X-lambda relation, and that the L-X-lambda scatter is intrinsic, i.e. will not be significantly reduced with larger sample sizes. Analysis of the scaling relation between L-X and T-X has shown that the fits are sensitive to the selection method of the sample, i.e. whether the sample is made up of clusters detected 'serendipitously' compared to those deliberately targeted by XMM. These differences are also seen in the L-X-lambda relation and, to a lesser extent, in the T-X-lambda relation. Exclusion of the emission from the cluster core does not make a significant impact on the findings. A combination of selection biases is a likely, but yet unproven, reason for these differences. Finally, we have also used our data to probe recent claims of anisotropy in the L-X-T-X relation across the sky. We find no evidence of anistropy, but stress this may be masked in our analysis by the incomplete declination coverage of the SDSS.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 22