s3c_wold_isak_roman2020.pdf (8.74 MB)

Lya Emitters at Cosmic Dawn with a Deep Roman Grism Survey

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posted on 13.01.2021, 06:58 by Wold, Isak

Lya surveys are an important tool to constrain the timing and topology of reionization. However, ground based Lya surveys are not effective at z>8 largely due to the increasing night sky background, and even at z~7 Lya surveys must conduct expensive spectroscopic followup of their Lya candidates to eliminate contamination.  The Roman Space Telescope’s ability to obtain deep near-infrared spectra over a wide field of view offers the opportunity to revolutionize this field. To investigate this further, we have simulated a deep multi-position-angle Roman WFI grism survey and tested our ability to recover z>7 Lya emitters.  Our initial simulations indicate that we can achieve the sensitivity required to constrain the ionization state of the z>7 intergalactic medium with Lya luminosity function tests.  I will discuss our latest higher fidelity simulations and how our ability to recover high-redshift Lya emitters is altered.