SIMBAD references

2010A&A...511A..15L - Astronomy and Astrophysics, volume 511, A15-15 (2010/2-2)

Spiral-like structure at the centre of nearby clusters of galaxies.


Abstract (from CDS):

X-ray data analysis have found that fairly complex structures at cluster centres are more common than expected. Many of these structures have similar morphologies, which exhibit spiral-like substructure. It is not yet well known how these structures are formed or maintained. Understanding the origin of these spiral-like features at the centre of some clusters is the major motivation behind this work. We analyse deep Chandra observations of 15 nearby galaxy clusters (0.01<z<0.06), and use X-ray temperature and substructure maps to detect small features at the cores of the clusters. We detect spiral-like features at the centre of 7 clusters: A85, A426, A496, Hydra A cluster, Centaurus, Ophiuchus, and A4059. These patterns are similar to those found in numerical hydrodynamic simulations of cluster mergers with non-zero impact parameter. In some clusters of our sample, a strong radio source also occupies the inner region of the cluster, which indicates a possible connection between the two. Our investigation implies that these spiral-like structures may be caused by off-axis minor mergers. Since these features occur in regions of high density, they may confine radio emission from the central galaxy producing, in some cases, unusual radio morphology.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: intergalactic medium - X-rays: galaxies: clusters - X-rays: general

Simbad objects: 27

goto Full paper

goto View the reference in ADS

To bookmark this query, right click on this link: simbad:2010A&A...511A..15L and select 'bookmark this link' or equivalent in the popup menu


© Université de Strasbourg/CNRS

    • Contact