The Herschel Virgo Cluster Survey: VI. The far-infrared view of M87

Details The Herschel Virgo Cluster Survey: VI. The far-infrared view of M87 The Herschel Virgo Cluster Survey: VI. The far-infrared view of M87

2010-05-17

arxiv.org/abs/1005.3059v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Letter accepted for publication in A&A (Herschel special issue)

Scientific paper

The origin of the far-infrared emission from the nearby radio galaxy M87 remains a matter of debate. Some studies find evidence of a far-infrared excess due to thermal dust emission, whereas others propose that the far-infrared emission can be explained by synchrotron emission without the need for an additional dust emission component. We present Herschel PACS and SPIRE observations of M87, taken as part of the science demonstration phase observations of the Herschel Virgo Cluster Survey. We compare these data with a synchrotron model based on mid-infrared, far-infrared, submm and radio data from the literature to investigate the origin of the far-infrared emission. Both the integrated SED and the Herschel surface brightness maps are adequately explained by synchrotron emission. At odds with previous claims, we find no evidence of a diffuse dust component in M87, which is not unexpected in the harsh X-ray environment of this radio galaxy sitting at the core of the Virgo Cluster.

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