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We present a multiwavelength study of an atypical submillimeter galaxy in theGOODS-North field, with the aim to understand its physical properties ofstellar and dust emission, as well as the central AGN activity. Although it isshown that the source is likely an extremely dusty galaxy at high redshift, itsexact position of submillimeter emission is unknown. With the new NOEMAinterferometric imaging, we confirm that the source is a unique dusty galaxy.It has no obvious counterpart in the optical and even NIR images observed withHST at lambda~<1.4um. Photometric-redshift analyses from both stellar and dustSED suggest it to likely be at z~>4, though a lower redshift at z~>3.1 cannotbe fully ruled out (at 90% confidence interval). Explaining its unusualoptical-to-NIR properties requires an old stellar population (~0.67 Gyr),coexisting with a very dusty ongoing starburst component. The latter iscontributing to the FIR emission, with its rest-frame UV and optical lightbeing largely obscured along our line of sight. If the observed fluxes at therest-frame optical/NIR wavelengths were mainly contributed by old stars, atotal stellar mass of ~3.5x10^11Msun would be obtained. An X-ray spectralanalysis suggests that this galaxy harbors a heavily obscured AGN withN_H=3.3x10^23 cm^-2 and an intrinsic 2-10 keV luminosity of L_X~2.6x10^44erg/s, which places this object among distant type 2 quasars. The radioemission of the source is extremely bright, which is an order of magnitudehigher than the star-formation-powered emission, making it one of the mostdistant radio-luminous dusty galaxies. The combined characteristics of thegalaxy suggest that the source appears to have been caught in a rare butcritical transition stage in the evolution of submillimeter galaxies, where weare witnessing the birth of a young AGN and possibly the earliest stage of itsjet formation and feedback.

A unique distant submillimeter galaxy with an X-ray-obscured radio-luminous active galactic nucleus