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2011MNRAS.414.2309O - Mon. Not. R. Astron. Soc., 414, 2309-2336 (2011/July-1)
Far-ultraviolet emission in the A2597 and A2204 brightest cluster galaxies.
OONK J.B.R., HATCH N.A., JAFFE W., BREMER M.N. and VAN WEEREN R.J.
Abstract (from CDS):
The FUV and U-band emission is enhanced in bright, filamentary structures surrounding the BCG nuclei. These filaments can be traced out to 20 kpc from the nuclei in the FUV. Excess FUV and U-band light is determined by removing emission due to the underlying old stellar population and mapped with 1-arcsec spatial resolution over the central 20-kpc regions of both galaxies.
We find the FUV and U excess emission to be spatially coincident, and a stellar interpretation requires the existence of a significant amount of 10 000–50 000 K stars. Correcting for nebular continuum emission and dust intrinsic to the BCG further increases the FUV to U-band emission ratio and implies that stars alone may not suffice to explain the observations. However, lack of detailed information on the gas and dust distribution and extinction law in these systems prevents us from ruling out a purely stellar origin.
Non-stellar processes, such as the central active galactic nucleus, scattering, synchrotron and Bremsstrahlung emission are investigated and found to not be able to explain the FUV and U-band measurements in A2597. Contributions from non-thermal processes not treated here should be investigated.
Comparing the FUV emission to the optical Hα line emitting nebula shows good agreement on kpc-scales in both A2597 and A2204. In concordance with an earlier investigation by [O'Dea et al. (2004)], we find that O stars can account for the ionizing photons necessary to explain the observed Hα line emission.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): galaxies: clusters: individual: Abell 2204 - galaxies: clusters: individual: Abell 2597 - ultraviolet: ISM
Nomenclature: Table A1: [OHJ2011] A2597 NN (Nos 0-26). Table A2: [OHJ2011] A2204 NN (Nos 0-26).
Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.
Simbad objects: 31
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