MOSEL survey: Spatially offset Lyman-continuum emission in a new emitter at z=3.088
arxiv(2024)
摘要
We present the discovery of a unique Lyman-continuum (LyC) emitter at
z=3.088. The LyC emission were detected using the Hubble Space Telescope (HST)
WFC3/UVIS F336W filter, covering a rest-frame wavelength range of 760-900
Angstrom. The peak signal-to-noise ratio (SNR) of LyC emission is 3.9 in a
r=0.24” aperture and is spatially offset by 0.29”+/-0.04” ( 2.2+/-0.3 kpc)
from the rest-UV emission peak (F606W). By combining imaging and spectroscopic
data from the James Webb Space Telescope (JWST) JADES, FRESCO and JEMS surveys,
along with VLT/MUSE data from the MXDF survey, we estimate that the probability
of random alignment with an interloper galaxy causing the LyC emission is less
than 6x10^-5. The interstellar medium (ISM) conditions in the galaxy are
similar to other LyC emitters at high redshift (12+log(O/H)=7.79+/-0.06, logU
=-3.27+/-0.14, O32 = 3.65+/-0.22), although the single-peaked Lyman-alpha
profile and lack of rest-UV emission lines suggest an optically thick ISM. We
think that LyC photons are leaking through a narrow cone of optically thin
neutral ISM, most likely created by a past merger (as evidenced by medium-band
F210M and F182M images). Using the escape fraction constraints from individual
leakers and a simple model, we estimate that the opening half-angle of
ionization cones can be as low as 16^deg (2
some of the theoretical constraints on the average escape fraction for
galaxies. The narrow opening angle required can explain the low number density
of confirmed LyC leakers.
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