2018ApJ...864..145H -
Astrophys. J., 864, 145-145 (2018/September-2)
A deep Lyα survey in ECDF-S and COSMOS. I. General properties of Lyα emitters at z ∼ 2.
HAO C.-N., HUANG J.-S., XIA X., ZHENG X., JIANG C. and LI C.
Abstract (from CDS):
Lyα emitters (LAEs) may represent an important galaxy population in the low-mass regime. We present our deep narrowband imaging surveys in the COSMOS and ECDF-S fields and study the properties of LAEs at z = 2.23 ± 0.03. The narrowband surveys conducted at the Magellan II telescope allow us to obtain a sample of 452 LAEs, reaching a 5σ limiting magnitude of ∼26 mag. Our Lyα luminosity functions extend to L(Lyα) =1041.8 erg s–1 with a steep faint-end slope. Using multiwavelength ancillary data, especially the deep Spitzer/IRAC 3.6 and 4.5 µm photometric data, we obtained reliable stellar mass estimates for 130 IRAC-detected LAEs, spanning a range of 8 < log(M*/M☉) < 11.5. For the remaining IRAC-undetected LAEs, the median-stacked spectral energy distribution yields a stellar mass of log(M*/M☉)=7.97–0.07+0.05 and the rest-frame ultraviolet emission indicates a median star formation rate (SFR) of log (SFR/M☉ yr–1) = -0.14 ± 0.35. There are six LAEs detected by the Spitzer/MIPS 24 µm or even Herschel far-infrared observations. Taking into account the six mid-IR/far-IR-detected LAEs, our LAEs cover a wide range in the SFR (1 M☉ yr–1 < SFR < 2000 M☉ yr–1). Although LAEs as a population are diverse in their stellar properties, they are mostly low-mass star-forming galaxies and follow the star formation main-sequence relations or their extrapolations to the low-mass end, implying a normal star-forming nature of LAEs. The clustering analysis indicates that our LAEs reside in dark matter halos with <log(Mh/M☉)>=10.8–1.1+0.56, suggesting that they are progenitors of local LMC-like galaxies.
Abstract Copyright:
© 2018. The American Astronomical Society. All rights reserved.
Journal keyword(s):
galaxies: evolution - galaxies: formation - galaxies: high-redshift - galaxies: luminosity function, mass function - galaxies: star formation
Simbad objects:
3
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