Lyman-alpha Luminosity Function near the Epoch of Reionization

Details Lyman-alpha Luminosity Function near the Epoch of Reionization Lyman-alpha Luminosity Function near the Epoch of Reionization

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942604t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #426.04

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Scientific paper

Lyman-alpha (Lya) emitting galaxies at high-redshifts provide an unique probe of cosmological reionization since the observed number density of Lya galaxies depends on the degree of ionization of the intergalactic medium (IGM). In addition, they are also a good tool to study the low-mass galaxy formation at high-redshifts.
We have performed two deep near-infrared narrowband (NB) imaging surveys in the EGS field using two custom-designed narrowband filters on the NEWFIRM imager, to search for candidate Lya galaxies at z 8. In a total survey volume of 2.8x104 Mpc3, with survey sensitivity >8x10-18 erg/s/cm2, we have found one candidate Lya galaxy at z=7.7. While spectroscopic confirmations are necessary, combining these observations with a previous NB survey, we find that the Lya luminosity function (LF) at z=7.7 is consistent with the LF at z=6.6 suggesting that the IGM is still relatively ionized even at z=7.7. Using the spectroscopic followup of four candidate Lya galaxies from our previous NB imaging survey, we disfavor only the brightest candidate as a real galaxy at z=7.7. Future, more sensitive spectroscopic observations are needed for robust conclusions about the remaining candidates.

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