The extended counterpart of submm source Lockman 850.1

The IRAM Plateau de Bure mm interferometer and deep K-band imaging have been used to identify the brightest submm source detected in the Lockman eld of the UK 8 mJy SCUBA survey. The near infrared counterpart is an extended (20{30 kpc), clumpy, and extremely red object. The spectral energy distribution suggests it to be a dusty star forming object at a redshift of about 3 (2{4). Its star formation rate and near- infrared properties are consistent with Lockman 850.1 being a massive elliptical in formation.

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