We present the results from a stellar population modeling analysis of a sample of 162 z = 4.5 and 14 z = 5.7 Ly emitting galaxies (LAEs) in the Boötes field, using deep Spitzer/IRAC data at 3.6 and 4.5 μm from the Spitzer Ly Survey, along with Hubble Space Telescope NICMOS and WFC3 imaging at 1.1 and 1.6 μm for a subset of the LAEs. This represents one of the largest samples of high-redshift LAEs imaged with Spitzer IRAC. We find that 30/162 (19%) of the z = 4.5 LAEs and 9/14 (64%) of the z = 5.7 LAEs are detected at ≥3σ in at least one IRAC band. Individual z = 4.5 IRAC-detected LAEs have a large range of stellar mass, from 5 × 108-1011 . One-third of the IRAC-detected LAEs have older stellar population ages of 100 Myr-1 Gyr, while the remainder have ages <100 Myr. A stacking analysis of IRAC-undetected LAEs shows this population to be primarily low mass (8-20 × 108 ) and young (64-570 Myr). We find a correlation between stellar mass and the dust-corrected ultraviolet-based star formation rate (SFR) similar to that at lower redshifts, in that higher mass galaxies exhibit higher SFRs. However, the z = 4.5 LAE correlation is elevated 4-5 times in SFR compared to continuum-selected galaxies at similar redshifts. The exception is the most massive LAEs which have SFRs similar to galaxies at lower redshifts suggesting that they may represent a different population of galaxies than the traditional lower-mass LAEs, perhaps with a different mechanism promoting Ly photon escape.
- galaxies: evolution
- galaxies: high-redshift
- galaxies: stellar content
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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Finkelstein, K. D. (Creator), Finkelstein, S. L. (Creator), Tilvi, V. (Creator), Malhotra, S. (Creator), Rhoads, J. E. (Creator), Grogin, N. A. (Creator), Pirzkal, N. (Creator), Dey, A. (Creator), Jannuzi, B. T. (Creator), Mobasher, B. (Creator), Pakzad, S. (Creator), Salmon, B. (Creator) & Wang, J. (Creator), Centre de Donnees Strasbourg (CDS), 2017