Lyman-Alpha Escape from Low-Mass, Compact, High-Redshift Galaxies

Abstract

We investigate the effects of stellar populations and sizes on Ly$\alpha$ escape in 27 spectroscopically confirmed and 35 photometric Lyman-Alpha Emitters (LAEs) at z $\approx$ 2.65 in seven fields of the Boötes region of the NOAO Deep Wide-Field Survey. We use deep $HST$/WFC3 imaging to supplement ground-based observations and infer key galaxy properties. Compared to typical star-forming galaxies (SFGs) at similar redshifts, the LAEs are less massive ($M_{\star }\approx 10^7-10^9{M}_{\odot }$), younger (ages $\lesssim$ 1 Gyr), smaller ($r_e<$ 1 kpc), less dust-attenuated (E(B$-$V) $\le$ 0.26 mag), but have comparable star-formation-rates (SFRs $\approx 1-100M_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$). Some of the LAEs in the sample may be very young galaxies having low nebular metallicities (${\mathrm{Z}}_{\mathrm{neb}}\lesssim 0.2{\mathrm{Z}}_{\odot }$) and/or high ionization parameters ($\log (\mathrm{U})\gtrsim -2.4$). Motivated by previous studies, we examine the effects of the concentration of star formation and gravitational potential on Ly$\alpha$ escape, by computing star-formation-rate surface density, ${\Sigma }_{\mathrm{SFR}}$ and specific star-formation-rate surface density, ${\Sigma }_{\mathrm{sSFR}}$. For a given ${\Sigma }_{\mathrm{SFR}}$, the Ly$\alpha$ escape fraction is higher for LAEs with lower stellar masses. LAEs have higher ${\Sigma }_{\mathrm{sSFR}}$ on average compared to SFGs. Our results suggest that compact star formation in a low gravitational potential yields conditions amenable to the escape of Ly$\alpha$ photons. These results have important implications for the physics of Ly$\alpha$ radiative transfer and for the type of galaxies that may contribute significantly to cosmic reionization.

arXiv comment36 pages, 15 figures; Accepted for publication in The Astronomical Journal

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