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Published July 10, 1998 | Published + Submitted
Journal Article Open

Near-Infrared Observations of a Redshift 4.92 Galaxy: Evidence for Significant Dust Absorption


Near-infrared imaging and spectroscopy have been obtained of the gravitationally lensed galaxy at z=4.92 discovered in Hubble Space Telescope (HST) images by Franx et al. Images at 1.2, 1.6, and 2.2 μm show the same arc morphology as the HST images. The spectrum with resolution λ/Δλ~70 shows no emission lines with equivalent width stronger than 100 Å in the rest-frame wavelength range 0.34-0.40 μm. In particular, [O II] λ3727 and [Ne III] λ3869 are not seen. The energy distribution is quite blue, as expected for a young stellar population with the observed Lyα flux. The spectral energy distribution can be fitted satisfactorily for such a young stellar population when absorption by dust is included. The models imply a reddening 0.1 mag

Additional Information

© 1998. The American Astronomical Society. Received 5 December 1997. Accepted 15 May 1998. Published 26 June 1998. We thank W. Harrison for assistance with the observations, and S. E. Persson for providing photometric standards in advance of publication. The W. M. Keck Observatory is operated as a scientific partnership between the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. It was made possible by the generous financial support of the W. M. Keck Foundation. Infrared astronomy at Caltech is supported by grants from the NSF and NASA. Support from STScI grant GO05989.01-94A is also gratefully acknowledged. This research has made use of the NASA/IPAC Extragalactic Database, which is operated by the Jet Propulsion Laboratory, Caltech, under contract with NASA.

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Published - Soifer_1998_ApJ_501_L171.pdf

Submitted - 9805219.pdf


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