Central Mass Profiles of the Nearby Cool-core Galaxy Clusters Hydra A and A478

We perform a weak-lensing study of the nearby cool-core galaxy clusters, Hydra A (\(z=0.0538\)) and A478 (\(z=0.0881\)), of which brightest cluster galaxies (BCGs) host powerful activities of active galactic nuclei (AGNs). For each cluster, the observed tangential shear profile is well described eit...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2015-12
Main Authors: Okabe, N, Umetsu, K, Tamura, T, Fujita, Y, Takizawa, M, Matsushita, K, Fukazawa, Y, Futamase, T, Kawaharada, M, Miyazaki, S, Mochizuki, Y, Nakazawa, K, Ohashi, T, Ota, N, Sasaki, T, Sato, K, Tam, S I
Format: Article
Language:English
Subjects:
Active galactic nuclei
Cold gas
Galactic clusters
Galaxies
Photometry
Star & galaxy formation
Stellar kinematics
Stellar mass
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We perform a weak-lensing study of the nearby cool-core galaxy clusters, Hydra A (\(z=0.0538\)) and A478 (\(z=0.0881\)), of which brightest cluster galaxies (BCGs) host powerful activities of active galactic nuclei (AGNs). For each cluster, the observed tangential shear profile is well described either by a single Navarro--Frenk--White model or a two-component model including the BCG as an unresolved point mass. For A478, we determine the BCG and its host-halo masses from a joint fit to weak-lensing and stellar photometry measurements. We find that the choice of initial mass functions (IMFs) can introduce a factor of two uncertainty in the BCG mass, whereas the BCG host halo mass is well constrained by data. We perform a joint analysis of weak-lensing and stellar kinematics data available for the Hydra A cluster, which allows us to constrain the central mass profile without assuming specific IMFs. We find that the central mass profile (\(r
ISSN:2331-8422
DOI:10.48550/arxiv.1503.04412