Advances in Astronomy and Space Physics, Volume 8, Issue 1-2, PP. 28-33 (2018)
doi: 10.17721/2227-1481.8.28-33

Probing the distant galaxy cluster JKCS 041
on the L − T − M scaling relations

Iu. V. Babyk

Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, ON N2L 3G1, Canada
Main Astronomical Observatory of the NAS of Ukraine, 27 Akademika Zabolotnoho Str., 03143 Kyiv, Ukraine

The detailed X-ray analysis of the distant galaxy cluster JKCS 041 is presented. We use deep (~75 ks) archived data of X-ray Chandra Observatory to extract the main physical characteristic for one of the most distant galaxy cluster known to date. We investigate the imaging and spectral properties of JKCS 041. We explore its surface brightness, density, entropy, cooling time, and mass profiles. The temperature of JKCS 041 is equal to 7.4 ± 2.9 keV while the total virial mass is M200 = (4.6 ± 2.9) × 1014MSun. The gas fraction is ~10% while the dark matter is ~90% at R200.

We use the obtained physical parameters of JKCS 041 to build numerous X-ray scaling relations. By adding JKCS 041 parameters we increase the redshift of our previous cluster’s sample from 1.4 to 1.8. We study the three classical relations between temperature, luminosity and total mass, and two additional. We find the concentration parameter of JKCS 041, build c − M relation and compare them with current hydrodynamic simulations. In addition, we explore, for the first time in the case of distant objects, the M − Y = T · Mg relation which is one of the most robust mass estimators. We conclude that concentration parameter, c, of JKCS 041 is in a good agreement with theoretical predictions. The obtained X-ray scaling relations were used to probe their evolution. We find that our results show inconsistent with self-similar evolution models.

X-ray observations, distant galaxy clusters: JKCS 041