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Resolving on 100 pc scales the UV-continuum in Lyman-$\alpha$ emitters between redshift 2 to 3 with gravitational lensing
Astrophysics of Galaxies · Submitted 8 Nov 2018
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim This morphology is consistent with disk-like structures of star-formation for more than half of the sample.
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The abstract, sentence by sentence
We present a study of seventeen LAEs at redshift 2$<z<$3 gravitationally lensed by massive early-type galaxies (ETGs) at a mean redshift of approximately 0.5. Using a fully Bayesian grid-based technique, we model the gravitational lens mass distributions with elliptical power-law profiles and reconstruct the UV-continuum surface brightness distributions of the background sources using pixellated source models. We find that the deflectors are close to, but not consistent with isothermal models in almost all cases, at the $2\sigma$-level. We take advantage of the lensing magnification (typically $\mu\simeq$ 20) to characterise the physical and morphological properties of these LAE galaxies. From reconstructing the ultra-violet continuum emission, we find that the star-formation rates range from 0.3 to 8.5 M$_{\odot}$ yr$^{-1}$ and that the galaxies are typically composed of several compact and diffuse components, separated by 0.4 to 4 kpc. Moreover, they have peak star-formation rate intensities that range from 2.1 to 54.1 M$_{\odot}$ yr$^{-1}$ kpc$^{-2}$. These galaxies tend to be extended with major axis ranging from 0.2 to 1.8 kpc (median 561 pc), and with a median ellipticity of 0.49. This morphology is consistent with disk-like structures of star-formation for more than half of the sample. However, for at least two sources, we also find off-axis components that may be associated with mergers. Resolved kinematical information will be needed to confirm the disk-like nature and possible merger scenario for the LAEs in the sample.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present a study of seventeen LAEs at redshift 2$<z<$3 gravitationally lensed by massive early-type galaxies (ETGs) at a mean redshift of approximately 0.5. | contribution 1.00 | 0.86 | 0.04 | asserted 0.99 |
| s1 | Using a fully Bayesian grid-based technique, we model the gravitational lens mass distributions with elliptical power-law profiles and reconstruct the UV-continuum surface brightness distributions of the background sources using pixellated source models. | method 1.00 | 0.97 | 0.03 | asserted 0.98 |
| s2 | We find that the deflectors are close to, but not consistent with isothermal models in almost all cases, at the $2\sigma$-level. | result 1.00 | 0.95 | 0.09 | asserted 0.99 |
| s3 | We take advantage of the lensing magnification (typically $\mu\simeq$ 20) to characterise the physical and morphological properties of these LAE galaxies. | method 0.61 | 0.83 | 0.05 | asserted 0.98 |
| s4 | From reconstructing the ultra-violet continuum emission, we find that the star-formation rates range from 0.3 to 8.5 M$_{\odot}$ yr$^{-1}$ and that the galaxies are typically composed of several compact and diffuse components, separated by 0.4 to 4 kpc. | result 1.00 | 0.98 | 0.24 | asserted 1.00 |
| s5 | Moreover, they have peak star-formation rate intensities that range from 2.1 to 54.1 M$_{\odot}$ yr$^{-1}$ kpc$^{-2}$. | result 1.00 | 0.96 | 0.07 | asserted 1.00 |
| s6 | These galaxies tend to be extended with major axis ranging from 0.2 to 1.8 kpc (median 561 pc), and with a median ellipticity of 0.49. | result 1.00 | 0.95 | 0.12 | asserted 0.98 |
| s7 | This morphology is consistent with disk-like structures of star-formation for more than half of the sample. | interpretation 0.93 | 0.91 | 0.18 | hedged possibility 0.96 |
| s8 | However, for at least two sources, we also find off-axis components that may be associated with mergers. | result 0.96 | 0.97 | 0.05 | hedged possibility 0.98 |
| s9 | Resolved kinematical information will be needed to confirm the disk-like nature and possible merger scenario for the LAEs in the sample. | future work 0.93 | 0.14 | 0.08 | hedged possibility 0.55 |
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The paper
Original abstract
We present a study of seventeen LAEs at redshift 2$<z<$3 gravitationally lensed by massive early-type galaxies (ETGs) at a mean redshift of approximately 0.5. Using a fully Bayesian grid-based technique, we model the gravitational lens mass distributions with elliptical power-law profiles and reconstruct the UV-continuum surface brightness distributions of the background sources using pixellated source models. We find that the deflectors are close to, but not consistent with isothermal models in almost all cases, at the $2\sigma$-level. We take advantage of the lensing magnification (typically $\mu\simeq$ 20) to characterise the physical and morphological properties of these LAE galaxies. From reconstructing the ultra-violet continuum emission, we find that the star-formation rates range from 0.3 to 8.5 M$_{\odot}$ yr$^{-1}$ and that the galaxies are typically composed of several compact and diffuse components, separated by 0.4 to 4 kpc. Moreover, they have peak star-formation rate intensities that range from 2.1 to 54.1 M$_{\odot}$ yr$^{-1}$ kpc$^{-2}$. These galaxies tend to be extended with major axis ranging from 0.2 to 1.8 kpc (median 561 pc), and with a median ellipticity of 0.49. This morphology is consistent with disk-like structures of star-formation for more than half of the sample. However, for at least two sources, we also find off-axis components that may be associated with mergers. Resolved kinematical information will be needed to confirm the disk-like nature and possible merger scenario for the LAEs in the sample.
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2 arXiv papers cite this in 2 sentences
Papers citing it · 1 sentence without a confident label
Uses its method or tool 1 paper
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We model the mock data with the pronto lens modelling code, which is based on a semi-linear inversion method within a hierarchical Bayesian framework and with an adaptive background source [ref] .
On what scales does strong lensing robustly constrain the mass profile of low-mass perturbers? · The robust radius for mass estimates · 1.00
What it cites
Uses the method or tool of 1 paper
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To quantify the uncertainties and probe any degeneracies among the model parameters, we use MultiNest [ref] to explore the parameter space within the prior volume.
Importance Nested Sampling and the MultiNest Algorithm · Lens modelling procedure · 1.00
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