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Nature of the Strongly Lensed Submillimeter Galaxy SMM J14011+0252
We have carried out near-infrared JHK spectroscopy of thegravitationally lensed submillimeter galaxy SMM J14011+0252 at z=2.565,using the OH-airglow suppressor and the Cooled Infrared Camera andSpectrograph for OHS on the Subaru Telescope. This object consists oftwo optical components, J1 and J2, which are lensed by the cluster Abell1835. J1 suffers additional strong lensing by a foreground galaxy atz=0.25 in the cluster. The rest-frame optical Hα, Hβ, and [OII] λ3727 lines are detected in both J1 and J2, and [N II]λλ6548, 6583 lines are also detected in J1. A diagnosis ofemission-line ratios shows that the excitation source of J1 is stellarin origin, consistent with previous X-ray observations. The continua ofJ1 and J2 show breaks at rest-frame 4000 Å, indicating arelatively young age. Combined with optical photometry, we have carriedout model-spectrum fitting of J2 and find that it is a very young (~50Myr) galaxy of rather small mass (~108 Msolar)that suffers some amount of dust extinction. A new gravitational lensingmodel is constructed to assess both the magnification factor andcontamination from the lensing galaxy of the component J1, using aHubble Space Telescope F702W image. We have found that J1 suffers stronglensing with magnification of ~30, and its stellar mass is estimated tobe <~109 Msolar. These results suggest that SMMJ14011+0252 is a major merger system at high redshift that undergoesintense star formation but is not a formation site of a giant ellipticalgalaxy. Still having plenty of gas, it will transform most of the gasinto stars and will evolve into a galaxy of <~1010Msolar. Therefore, this system is possibly an ancestor of apresent-day, less massive galaxy such as a midsized elliptical galaxy ora spiral galaxy.Based on data collected at Subaru Telescope, which is operated by theNational Astronomical Observatory of Japan.
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