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A background galaxy in the field of the beta Pic debris disk

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arxiv 1203.0475 v1 pith:6VGRJWPT submitted 2012-03-02 astro-ph.CO astro-ph.EP

S. Regibo , B. Vandenbussche , C. Waelkens , B. Acke , B. Sibthorpe , M. Nottebaere , K. Voet , J. Di Francesco
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M. Fridlund W.K. Gear R.J. Ivison G. Olofsson
This is my paper · ORCID
classification astro-ph.COastro-ph.EP
keywords diskmicronblobbackgroundbandsbetaspiredebris
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Herschel images in six photometric bands show the thermal emission of the debris disk surrounding beta Pic. In the three PACS bands at 70 micron, 100 micron and 160 micron and in the 250 micron SPIRE band, the disk is well-resolved, and additional photometry is available in the SPIRE bands at 350 micron and 500 micron, where the disk is only marginally resolved. The SPIRE maps reveal a blob to the southwest of beta Pic, coinciding with submillimetre detection of excess emission in the disk. We investigated the nature of this blob. Our comparison of the colours, spectral energy distribution and size of the blob, the disk and the background sources shows that the blob is most likely a background source with a redshift between z =1.0 and z = 1.6.

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