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The Hubble Ultra Deep Field source JD2 presented in Mobasher et al. (2005) isan unusual galaxy that is very faint at all wavelengths shortward of 1.1micron. Photometric redshift fits to data at 0.4 to 8 microns yield asignificant probability that it is an extremely massive galaxy at z~6.5. Inthis paper we present new photometry at 16 microns and 22 micron from SpitzerInfrared Spectrograph (IRS) peak-up imaging of the Great Observatories OriginsDeep Survey (GOODS) fields. We find that the spectral energy distribution showsa factor of ~4 rise in flux density between the 16 micron and 22 micronbandpass which is most likely due to the entrance of polycyclic aromatichydrocarbon emission features into the 22 micron and 24 micron passbands. Theflux ratio between these bandpasses can be best fit by a z~1.7 luminousinfrared galaxy with a bolometric luminosity of (2-6)\times10^{11} L_suncorresponding to a star-formation rate of 80 M_sun/yr. The predicted fluxdensity values at other longer wavelengths are below the detection limits ofcurrent instrumentation but such sources could potentially be detected inlensed submillimeter surveys. Re-evaluation of the optical/near-infraredphotometry continues to favor z>6 photometric redshift solutions, but we arguethat the consistency of the multiwavelength parameters of this galaxy withother dusty starbursts favor the z~2 mid-infrared photometric redshift. Thedata presented here provide evidence that optically undetected near-infraredsources which are detected at 24 microns are most likely dusty, starburstgalaxies at a redshift of z~2 with stellar masses >10^{10} M_sun.

HUDF-JD2: Mid-infrared Evidence for a z~2 Luminous Infrared Galaxy