Deprojected analysis of Abell 1835 observed with Chandra and compared with XMM-Newton

TL;DR

This study compares X-ray properties of galaxy cluster Abell 1835 observed with Chandra and XMM-Newton, revealing consistent mass estimates but persistent temperature profile differences, highlighting calibration challenges.

Contribution

It introduces a deprojection analysis of Abell 1835 and investigates the temperature discrepancies between Chandra and XMM-Newton data, emphasizing calibration issues.

Findings

Deprojection shows minimal change in properties.

XMM-Newton temperatures are more reliable.

Mass estimates from Chandra and XMM-Newton are consistent.

Abstract

Using a deprojection technique, we study the X-ray properties of the galaxy cluster Abell 1835 observed with Chandra, including temperature, abundance, electron density, gas mass fraction, and total mass. A comparison with the results without deprojection shows that the properties do not change much. When we compare the results with those of XMM-Newton, the difference between the temperature profiles derived from Chandra and XMM-Newton data still exists, even if the point-spread function effect of XMM-Newton is corrected. To investigate the reasons for the difference, we used the spectra to cross-calibrate the temperatures. They show that the Chandra spectra can be fitted well with XMM-Newton temperatures. Furthermore, we derive the electron density profile from Chandra data with XMM-Newton temperatures and calculate the projected mass, which is consistent with the XMM-Newton mass and a little lower than the weak lensing mass at r_500. Thus, it seems that the temperature derived from XMM-Newton may be more reliable.