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Title: KECK-I MOSFIRE SPECTROSCOPY OF THE z {approx} 12 CANDIDATE GALAXY UDFj-39546284

We report the results of deep (4.6 hr) H-band spectroscopy of the well studied z {approx} 12 H-band dropout galaxy candidate UDFj-39546284 with MOSFIRE on Keck-I. These data reach a sensitivity of 5-10 Multiplication-Sign 10{sup -19} erg s{sup -1} cm{sup -2} per 4.4 A resolution element between sky lines. Previous papers have argued that this source could either be a large equivalent width line emitting galaxy at 2 < z < 3.5 or a luminous galaxy at z {approx} 12. We find a 2.2{sigma} peak associated with a line candidate in deep Hubble Space Telescope Wide-Field Camera 3 Infrared grism observations, but at a lower flux than expected. After considering several possibilities, we conclude these data cannot conclusively confirm or reject the previous line detection, and significantly deeper spectroscopic observations are required. We also search for low-redshift emission lines in 10 other 7 < z < 10 z, Y, and J-dropout candidates in our mask and find no significant detections.
Authors:
 [1] ; ; ;  [2] ; ;  [3]
  1. Spitzer Science Center, 314-6 Caltech, Pasadena, CA 91125 (United States)
  2. Institute for Astronomy, Swiss Federal Institute of Technology (ETH Zurich), CH-8093 Zurich (Switzerland)
  3. California Institute of Technology, 314-6 Caltech, Pasadena, CA 91125 (United States)
Publication Date:
OSTI Identifier:
22136606
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 773; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CAMERAS; GALAXIES; LINE WIDTHS; RED SHIFT; RESOLUTION; SENSITIVITY; SKY; SPECTROSCOPY; TELESCOPES