Determining the Physical Nature of a Unique Giant Lya Emitter at z=6.595

Details Determining the Physical Nature of a Unique Giant Lya Emitter at z=6.595 Determining the Physical Nature of a Unique Giant Lya Emitter at z=6.595

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12265o&link_type=abstract

HST Proposal ID #12265. Cycle 18

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Scientific paper

We propose deep WFC3/IR imaging for a giant Lya emitter {LAE} with a Keck spectroscopic redshift of z=6.595 discovered by extensive narrow-band imaging with Subaru in the SXDS-UKIDSS/UDS field. This remarkable object is unique in many respects including its large stellar mass and luminous nebula which extends over 17 kpc; no equivalent source has been found in other surveys. The nature of this rare object is unclear. Fundamental to progress is determining the origin of star formation in such an early massive object; if the age of the stellar population is short we are likely witnessing a special moment in the formation history of a massive galaxy. The heating source for the nebula is also unclear; options include intense star formation, the infall of cold gas onto a dark halo or shock heating from a merger. We will take deep broad-band {F125W and F160W} imagesand an intermediate-band {F098M} image which will be analyzed in conjunction with ultra-deep IRAC 3.6 and 4.5 micron data being taken by the Spitzer/SEDS project. These data will enable us to constrain the star formation rate and stellar age. Moreover, the UV continuum morphology and Lya-line distribution will be investigated for evidence of a major merger, cold accretion, or hot bubbles associated with outflows. We will address the physical origin of the remarkable object observed at an epoch where massive galaxies are thought to begin their assembly.;

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