Kavli Affiliate: Linhua Jiang
| First 5 Authors: Yixiao Liu, Y. Sophia Dai, Stijn Wuyts, Jia-Sheng Huang, Linhua Jiang
| Summary:
We study 10 spectroscopically confirmed Ly$alpha$ emitters (LAEs) at
$zapprox3.1$ in the UDS field, covered by JWST/NIRCam in the PRIMER program.
All LAEs are detected in all NIRCam bands from F090W to F444W, corresponding to
restframe 2200AA–1.2$mathrm{mu m}$. Based on morphological analysis of the
F200W images, three out of the 10 targets are resolved into pair-like systems
with separations of $<0.9”$, and another three show asymmetric structures. We
then construct the spectral energy distributions (SEDs) of these LAEs. All
sources, including the pairs, show similar SED shapes, with a prominent flux
excess in the F200W band, corresponding to extremely strong [O III]+H$beta$
emission lines (${rm EW_{rest}}=740$–$6500,$AA). The median effective
radii, stellar mass, and UV slope of our sample are 0.36$,$kpc,
$3.8times10^7,M_odot$, and –2.48, respectively. The average burst age,
estimated by stellar mass over star formation rate, is $<40,$Myr. These
measurements reveal an intriguing starbursting dwarf galaxy population lying
off the extrapolations of the $z sim 3$ scaling relations to the low-mass end:
$sim 0.7$ dex above the star-forming main sequence, $sim 0.35$ dex below the
mass–size relation, and bluer in the UV slope than typical high-z galaxies at
similar UV luminosities. We speculate that these numbers may require a larger
main sequence scatter or tail in the dwarf galaxy regime towards the starburst
outliers.
| Search Query: ArXiv Query: search_query=au:”Linhua Jiang”&id_list=&start=0&max_results=3