Abstract
We present the discovery of diffuse optical line emission in the Centaurus cluster seen with the MUSE IFU. The unparalleled sensitivity of MUSE allows us to detect the faint emission from these structures which extend well beyond the bounds of the previously known filaments. Diffuse structures (emission surrounding the filaments, a northern shell and an extended Halo) are detected in many lines typical of the nebulae in cluster cores ([NII]$_{\lambda 6548\&6583}$ ,[SII]$_{\lambda 6716\&6731}$, [OI]$_{\lambda 6300}$, [OIII]$_{\lambda 4959\&5007}$ etc.) but are more than an order of magnitude fainter than the filaments, with the faint halo only detected through the brightest line in the spectrum ([NII]$_{\lambda 6583}$). These structures are shown to be kinematically distinct from the stars in the central galaxy and have different physical and excitation states to the filaments. Possible origins are discussed for each structure in turn and we conclude that shocks and/or pressure imbalances are resulting in gas dispersed throughout the cluster core, formed from either disrupted filaments or direct cooling, which is not confined to the bright filaments.
Original language | English |
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Pages (from-to) | 4984-4998 |
Number of pages | 15 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 483 |
Issue number | 4 |
Early online date | 22 Dec 2018 |
DOIs | |
Publication status | Published - 26 Mar 2019 |
Bibliographical note
Funding Information:SLH and ACF acknowledge support from the European Research Council for Advanced Grant Program number 340442– FEEDBACK.
Funding Information:
PS, FC, VO, FP, and RB acknowledge support from the Agence Nationale de la Recherche (ANR) grant LYRICS (ANR-16-CE31-0011).
Publisher Copyright:
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.
Keywords
- astro-ph.CO
- astro-ph.GA
- galaxies: elliptical and cD
- galaxies: clusters: individual: Centaurus
- galaxies: clusters: intracluster medium
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science