Lyman Alpha Tomography

Details Lyman Alpha Tomography Lyman Alpha Tomography

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940208g&link_type=abstract

American Astronomical Society, AAS Meeting #219, #402.08

Astronomy and Astrophysics

Astronomy

Scientific paper

Narrow-band filters are often used to find emission-line galaxies at predetermined redshifts. When applied to high-redshift Lyman Alpha Emitting galaxies, typical surveys include galaxies over a redshift range of deltaz 0.1. Here we show that narrow-band filters with overlapping bandpasses can be used to pinpoint the redshifts of emission-line galaxies to much higher precision, by performing "tomography" that uses the ratio of fluxes between the two filters to identify where in their combined bandpass the emission line is falling. We report an empirical test of this technique, using deep NB4990 and NB5015 Angstrom MUSYC images of the Extended Chandra Deep Field-South obtained at the CTIO 4m telescope (Gawiser et al. 2006, Ciardullo et al. 2011.) While formally a type of photometric redshift, Lyman Alpha Tomography allows the redshifts of these galaxies to be determined to deltaz/(1+z) 0.002, which is the same precision achievable with low-resolution (R 100) spectrographs for these dim, single-emission-line galaxies. Determining the redshifts reveals emission-line luminosities and, when combined with broadband imaging, equivalent widths (EW). Hence this technique enables large galaxy redshift surveys that simultaneously reveal emission-line galaxy luminosity functions and EW distributions without the need to perform resource-intensive spectroscopy. We discuss how the technique can be employed on next generation wide-field imagers, including DECam, Hyper Suprime Cam, and ODI.
This material is based upon work supported by the National Science Foundation under Grant Nos. 0807570, 0807885, 1055919, and by DOE grants DE-GF02-08ER41560 and DE-FG02-08ER41561.

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