Quantifying substructures in Hubble Frontier Field clusters: comparison with ΛCDM simulations

Mohammed, Irshad; Saha, Prasenjit; Williams, Liliya L.  R.; Liesenborgs, Jori; Sebesta, Kevin

doi:10.1093/mnras/stw727

Title: Quantifying substructures in Hubble Frontier Field clusters: comparison with ΛCDM simulations

Journal Article · Wed Apr 13 00:00:00 EDT 2016 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/stw727· OSTI ID:1260265

Mohammed, Irshad ^[1]; Saha, Prasenjit ^[2]; Williams, Liliya L. R. ^[3]; Liesenborgs, Jori ^[4]; Sebesta, Kevin ^[3]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Zurich (Switzerland)
Univ. of Zurich (Switzerland)
Univ. of Minnesota, Minneapolis, MN (United States)
Univ. of Hasselt (Belgium)

The Hubble Frontier Fields (HFF) are six clusters of galaxies, all showing indications of recent mergers, which have recently been observed for lensed images. As such they are the natural laboratories to study the merging history of galaxy clusters. In this work, we explore the 2D power spectrum of the mass distribution $$P_{\rm M}(k)$$ as a measure of substructure. We compare $$P_{\rm M}(k)$$ of these clusters (obtained using strong gravitational lensing) to that of $$\Lambda$$CDM simulated clusters of similar mass. In order to compute lensing $$P_{\rm M}(k)$$, we produced free-form lensing mass reconstructions of HFF clusters, without any light traces mass (LTM) assumption. Moreover, the inferred power at small scales tends to be larger if (i)~the cluster is at lower redshift, and/or (ii)~there are deeper observations and hence more lensed images. In contrast, lens reconstructions assuming LTM show higher power at small scales even with fewer lensed images; it appears the small scale power in the LTM reconstructions is dominated by light information, rather than the lensing data. The average lensing derived $$P_{\rm M}(k)$$ shows lower power at small scales as compared to that of simulated clusters at redshift zero, both dark-matter only and hydrodynamical. The possible reasons are: (i)~the available strong lensing data are limited in their effective spatial resolution on the mass distribution, (ii)~HFF clusters have yet to build the small scale power they would have at $$z\sim 0$$, or (iii)~simulations are somehow overestimating the small scale power.

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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1260265

Report Number(s):: FERMILAB-PUB-16-083-A; arXiv:1507.01532; 1381500

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 459, Issue 2; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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Title: Quantifying substructures in Hubble Frontier Field clusters: comparison with ΛCDM simulations

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