Issue |
A&A
Volume 517, July 2010
|
|
---|---|---|
Article Number | A10 | |
Number of page(s) | 7 | |
Section | Extragalactic astronomy | |
DOI | https://doi.org/10.1051/0004-6361/200913622 | |
Published online | 23 July 2010 |
The radio–X-ray luminosity correlation of radio halos at low radio frequency
Application of the turbulent re-acceleration model
INAF - Istituto di Radioastronomia, via P. Gobetti 101, 40129 Bologna, Italy e-mail: rcassano@ira.inaf.it
Received:
8
November
2009
Accepted:
6
April
2010
Aims. We show expectations on the radio–X-ray luminosity correlation of radio halos at 120 MHz. According to the turbulent re-acceleration scenario, we expect that low-frequency observations can detect a new population of radio halos that due to their ultra-steep spectra are missed by present observations at ~GHz frequencies. These radio halos are also supposed to be less luminous than presently observed halos hosted in clusters with the same X-ray luminosity.
Methods. With Monte Carlo procedures we show that these ultra-steep spectrum halos at 120 MHz cause a steepening and a broadening of the correlation between the synchrotron power and the cluster X-ray luminosity with respect to that observed at 1.4 GHz.
Results. We investigate the role of future low-frequency radio surveys and find that the upcoming LOFAR surveys will be able to test these expectations.
Key words: radiation mechanisms: non-thermal / galaxies: clusters: general / radio continuum: general / X-rays: general
© ESO, 2010
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