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2021ApJ...914....2K - Astrophys. J., 914, 2-2 (2021/June-2)

The compact UV size of Green Pea galaxies as local analogs of high-redshift Lyα-emitters.

KIM K.J., MALHOTRA S., RHOADS J.E. and YANG H.

Abstract (from CDS):

We study the dependence of Lyα escape from galaxies on UV continuum size and luminosity using a sample of 40 Green Pea (GP) galaxies, which are the best local analogs of high-redshift Lyα emitters (LAEs). We use the Cosmic Origins Spectrograph near-ultraviolet images from the Hubble Space Telescope to measure the UV size and luminosity with 0.''047 spatial resolution. Like most galaxies the GPs show a log-normal size distribution. They also show a positive correlation between size and UV-continuum luminosity. The slope of the size-continuum luminosity relation for GPs is consistent with those of continuum-selected star-forming galaxies (SFGs) at low and high redshifts. A distinctive feature of GPs is a very compact typical radius of 0.33 kpc with a population spread (1σ) of 0.19 kpc. The peak of the size distribution and the intercept of the size-luminosity relation of GPs are noticeably smaller than those of continuum-selected SFGs at similar redshifts. There are statistically significant anticorrelations found between the circularized half-light radius (rcir,50), the Lyα equivalent width (EW(Lyα)), and the Lyα escape faction (fesc^Lyα^), suggesting that small UV-continuum radii are crucial for Lyα emission. GPs and high-redshift LAEs have similar sizes, once spatial resolution effects are properly considered. Our results show that a compact small size is crucial for escape of Lyα photons, and that Lyα emitters show constant characteristic size independent of their redshift.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Compact galaxies - Starburst galaxies - Galaxy formation - Galaxy evolution - Galaxy structure - Star formation - Reionization

Simbad objects: 43

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2021.10.22-10:02:26

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