| Issue |
A&A
Volume 414, Number 3, February II 2004
|
|
|---|---|---|
| Page(s) | L41 - L44 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:20031749 | |
| Published online | 27 January 2004 | |
Letter to the Editor
Is there a hard tail in the Coma Cluster X-ray spectrum?
1
Istituto di Astrofisica Spaziale e Fisica Cosmica, via Bassini 15, 20133 Milano, Italy
2
Università degli Studi di Milano, Dip. di Fisica, via Celoria 16, 20133 Milano, Italy
Corresponding author: M. Rossetti, rossetti@mi.iasf.cnr.it
Received:
30
September
2003
Accepted:
17
December
2003
We report results from a re-analysis of the BeppoSAX observation of Coma and from the
analysis of a second, yet unpublished observation of the same object.
From our re-analysis of the first observation we find that the statistical evidence
for a hard tail is about 2σ. From the analysis of the second observation which,
thanks to the lower background and the longer exposure time, is characterized by
a larger signal-to-noise we find no evidence for a hard tail.
From the upper limit on the flux of the hard tail, using the standard Inverse
Compton formulae, we derive a lower limit for the magnetic of 
consistent with Faraday rotation measurements.
Key words: cosmic microwave background / galaxies: clusters: individual: Coma / magnetic field / radiation mechanism: non-thermal / X-rays: galaxies: clusters
© ESO, 2004
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