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Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2011

Herschel observations of the Centaurus cluster - the dynamics of cold gas in a cool core

Résumé

Brightest cluster galaxies (BCGs) in the cores of galaxy clusters have distinctly different properties from other low-redshift massive ellipticals. The majority of the BCGs in cool-core clusters show signs of active star formation. We present observations of NGC 4696, the BCG of the Centaurus galaxy cluster, at far-infrared (FIR) wavelengths with the Herschel space telescope. Using the PACS spectrometer, we detect the two strongest coolants of the interstellar medium, [C II] at 157.74 mum and [O I] at 63.18 mum, and in addition [N II] at 121.90 mum. The [C II] emission is extended over a region of 7 kpc with a similar spatial morphology and kinematics to the optical Halpha emission. This has the profound implication that the optical hydrogen recombination line, Halpha, the optical forbidden lines, [N II] lambda6583 Å, the soft X-ray filaments and the FIR [C II] line all have the same energy source.
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hal-03786472 , version 1 (07-01-2023)

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Rupal Mittal, C. P. O'Dea, Gary J. Ferland, J. B. Raymond Oonk, Alastair C. Edge, et al.. Herschel observations of the Centaurus cluster - the dynamics of cold gas in a cool core. Monthly Notices of the Royal Astronomical Society, 2011, 418, pp.2386-2402. ⟨10.1111/j.1365-2966.2011.19634.x⟩. ⟨hal-03786472⟩
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