NEW RESULTS FROM THE MAGELLAN IMACS SPECTROSCOPIC Ly{alpha} SURVEY: NICMOS OBSERVATIONS OF Ly{alpha} EMITTERS AT z = 5.7
- Department of Physics, University of California, Santa Barbara, CA 93106 (United States)
- Observatories of the Carnegie Institute of Washington, Santa Barbara Street, Pasadena, CA 91101 (United States)
- Department of Astronomy and Physics, Saint Mary's University, Halifax, NS B3H 3C3 (Canada)
We present NICMOS J {sub 110} (rest-frame 1200-2100 A) observations of the three z = 5.7 Ly{alpha} emitters discovered in the blind multislit spectroscopic survey by Martin et al. These images confirm the presence of the two sources that were previously only seen in spectroscopic observations. The third source, which is undetected in our J {sub 110} observations, has been detected in narrowband imaging of the Cosmic Origins Survey, so our non-detection implies a rest-frame equivalent width >146 A (3{sigma}). The two J {sub 110}-detected sources have more modest rest-frame equivalent widths of 30-40 A, but all three are typical of high-redshift Ly{alpha} emitters. In addition, the J {sub 110}-detected sources have UV luminosities that are within a factor of 2 of L*{sub UV}, and sizes that appear compact (r {sub hl{approx}} 0.''15) in our NIC2 images-consistent with a redshift of 5.7. We use these UV-continuum and Ly{alpha} measurements to estimate the i {sub 775}-z {sub 850} colors of these galaxies and show that at least one and possibly all three would be missed by the i-dropout Lyman break galaxy selection. These observations help demonstrate the utility of multislit narrowband spectroscopy as a technique for finding faint emission-line galaxies.
- OSTI ID:
- 21454983
- Journal Information:
- Astrophysical Journal, Vol. 719, Issue 1; Other Information: DOI: 10.1088/0004-637X/719/1/685; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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