NOAO >   Observing Info >   Approved Programs >   2014A-0253

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Proposal Information for 2014A-0253


PI: Dan Coe, STScI, dcoe@stsci.edu
Address: STScI, 3700 San Martin Dr., Baltimore, MD 21210, USA

CoI: Renske Smit, Leiden
CoI: Larry Bradley, STScI
CoI: Rychard Bouwens, Leiden
CoI: Mario Nonino, INAF-OATs
CoI: Adi Zitrin, Caltech (Oct 1)
CoI: Julian Merten, JPL
CoI: Piero Rosati, Ferrara
CoI: Stella Seitz, USM/MPE
CoI: Anna Monna, USM/MPE
CoI: Marc Postman, STScI
CoI: Daniel Kelson, OCIW

Title: MOSFIRE spectroscopy of lensed galaxies, including the brightest z ~ 8 candidate known

Abstract: Significant \Lya emission is detected more often in galaxies at z ~ 6 than at z ~ 7 and has yet to be detected at z ~ 8. This observed drop-off supports other evidence that reionization was incomplete at z > 6. Neutral hydrogen likely absorbed this \Lya\ emission which should otherwise be seen more frequently with increasing redshift (as observed from z ~ 4 to 6) given increased starburst rates. Spectroscopic searches for \Lya in larger samples of candidates at z ~ 8 and higher will further constrain the timeline and patchiness of reionization. Detections of \Lya will importantly confirm z ~ 8 candidates as well as yield emission line strengths and profile shapes further constraining the star formation and propagation properties of the UV photons likely responsible for reionization. Here we propose MOSFIRE Y-band spectroscopy of two brightly lensed z ~ 8 candidates, including the brightest yet known (J ~ H ~ 25.2 AB mag). Both were discovered in 16-band imaging obtained by the Cluster Lensing and Supernova survey with Hubble (CLASH) and also detected in Spitzer imaging at 3.6 and 4.5 \um. Our MOSFIRE observations will also yield NIR spectroscopy of other brightly lensed and cluster galaxies.


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NOAO >   Observing Info >   Approved Programs >   2014A-0253

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