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J/ApJ/815/57 Follow-up spectroscopy of Lyalpha 3<z<7 emitters (U+, 2015)
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Beginning of ReadMe :J/ApJ/815/57 Follow-up spectroscopy of Lyalpha 3<z<7 emitters (U+, 2015)
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A correlation between Lyalpha spectral line profile and
rest-frame UV morphology.
U V., Hemmati S., Darvish B., Mobasher B., Nayyeri H., Dickinson M.,
Stern D., Spinrad H., Mallery R.
<Astrophys. J., 815, 57 (2015)>
=2015ApJ...815...57U (SIMBAD/NED BibCode)
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ADC_Keywords: Galaxies, spectra ; Redshifts ; Morphology ; Interstellar medium
Keywords: galaxies: evolution; galaxies: high-redshift; galaxies: ISM
Abstract:
We explore the relationship between the spectral shape of the
Lyalpha emission and the UV morphology of the host galaxy using a
sample of 304 Lyalpha-emitting BVi-dropouts at 3<z<7 in the Great
Observatories Origins Deep Survey and Cosmic Evolution Survey fields.
Using our extensive reservoir of high-quality Keck DEIMOS spectra
combined with Hubble Space Telescope WFC3 data, we measure the
Lyalpha line asymmetries for individual galaxies and compare them to
axial ratios measured from observed J- and H-band (restframe UV)
images. We find that the Lyalpha skewness exhibits a large scatter
at small elongation (a/b<2), and this scatter decreases as the axial
ratio increases. Comparison of this trend to radiative transfer models
and various results from the literature suggests that these
high-redshift Lyalpha emitters are not likely to be intrinsically
round and symmetric disks, but they probably host galactic outflows
traced by Lyalpha emitting clouds. The ionizing sources are
centrally located, and the optical depth is a good indicator of the
absorption and scattering events on the escape path of Lyalpha
photons from the source. Our results find no evidence of evolution in
Lyalpha asymmetry or axial ratio with look-back time.
Description:
The Keck spectroscopic follow-up campaign of high-redshift galaxies in
the GOODS+CANDELS fields has been an ongoing project since 2005.