Optical Emission Line Nebulae in Galaxy Cluster Cores 1: The Morphological, Kinematic and Spectral Properties of the Sample

S. L. Hamer, A. C. Edge, A. M. Swinbank, R. J. Wilman, F. Combes, P. Salomé, A. C. Fabian, C. S. Crawford, H. R. Russell, J. Hlavacek-Larrondo, B. McNamara, M. N. Bremer

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Abstract

We present an Integral Field Unit survey of 73 galaxy clusters and groups with the VIsible Multi Object Spectrograph (VIMOS) on VLT. We exploit the data to determine the H_alpha gas dynamics on kpc-scales to study the feedback processes occurring within the dense cluster cores. We determine the kinematic state of the ionised gas and show that the majority of systems (~2/3) have relatively ordered velocity fields on kpc scales that are similar to the kinematics of rotating discs and are decoupled from the stellar kinematics of the Brightest Cluster Galaxy. The majority of the H$\alpha$ flux (>50%) is typically associated with these ordered kinematics and most systems show relatively simple morphologies suggesting they have not been disturbed by a recent merger or interaction. Approximately 20% of the sample (13/73) have disturbed morphologies which can typically be attributed to AGN activity disrupting the gas. Only one system shows any evidence of an interaction with another cluster member. A spectral analysis of the gas suggests that the ionisation of the gas within cluster cores is dominated by non stellar processes, possibly originating from the intracluster medium itself.
Original languageEnglish
Pages (from-to)1758-1789
Number of pages32
JournalMonthly Notices of the Royal Astronomical Society
Volume460
Issue number2
Early online date6 May 2016
DOIs
Publication statusPublished - 1 Aug 2016

Keywords

  • astro-ph.GA
  • astro-ph.CO

Cite this

Hamer, S. L., Edge, A. C., Swinbank, A. M., Wilman, R. J., Combes, F., Salomé, P., Fabian, A. C., Crawford, C. S., Russell, H. R., Hlavacek-Larrondo, J., McNamara, B., & Bremer, M. N. (2016). Optical Emission Line Nebulae in Galaxy Cluster Cores 1: The Morphological, Kinematic and Spectral Properties of the Sample. Monthly Notices of the Royal Astronomical Society, 460(2), 1758-1789. https://doi.org/10.1093/mnras/stw1054