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Rest-frame UV Properties of Luminous Strong Gravitationally Lensed Ly$\alpha$ Emitters from the BELLS GALLERY Survey
Astrophysics of Galaxies · Submitted 9 Dec 2019
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim By taking the magnifications into account, we show that LAEs can be as luminous as L(Lya) = 30x10$^{42}$ erg s-1 and M(UV) = -23 (AB) without invoking an AGN component, in contrast with previous findings.
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We present deep rest-frame UV spectroscopic observations using the Gran Telescopio Canarias of six gravitationally lensed Lya emitters (LAEs) at $2.36<z<2.82$ selected from the BELLS GALLERY survey. By taking the magnifications into account, we show that LAEs can be as luminous as L(Lya) = 30x10$^{42}$ erg s-1 and M(UV) = -23 (AB) without invoking an AGN component, in contrast with previous findings. We measure Lya rest-frame equivalent widths, EW(Lya), ranging from 16\AA to 50\AA and Lya escape fractions, fesc(Lya), from 10% to 40%. Large EW(Lya) and fesc(Lya) are found predominantly in LAEs showing weak low-ionization ISM absorption (EW < 1\AA) and narrow Lya profiles (< 300 km s-1 FWHM) with their peak close (< 80 km s-1) to their systemic redshifts, suggestive of less scatter from low HI column densities that favours the escape of Lya photons. We infer stellar metallicities of Z/Zsun ~ 0.2 in almost all LAEs by comparing the P-Cygni profiles of the wind lines NV1240\AA and CIV1549\AA with those from stellar synthesis models. We also find a trend between M(UV) and the velocity offset of ISM absorption lines, such as the most luminous LAEs experience stronger outflows. The most luminous LAEs show star formation rates up to 180 Msun yr-1, yet they appear relatively blue ($\beta$(UV) ~ -1.8 to -2.0) showing evidence of little dust attenuation (E(B-V) = 0.10-0.14). These luminous LAEs may be particular cases of young starburst galaxies that have had no time to form large amounts of dust. If so, they are ideal laboratories to study the early phase of massive star formation, stellar and dust mass growth, and chemical enrichment histories of starburst galaxies at high-z.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present deep rest-frame UV spectroscopic observations using the Gran Telescopio Canarias of six gravitationally lensed Lya emitters (LAEs) at $2.36<z<2.82$ selected from the BELLS GALLERY survey. | contribution 0.87 | 0.97 | 0.04 | asserted 0.98 |
| s1 | By taking the magnifications into account, we show that LAEs can be as luminous as L(Lya) = 30x10$^{42}$ erg s-1 and M(UV) = -23 (AB) without invoking an AGN component, in contrast with previous findings. | result 0.99 | 0.94 | 0.65 | asserted 1.00 |
| s2 | We measure Lya rest-frame equivalent widths, EW(Lya), ranging from 16\AA to 50\AA and Lya escape fractions, fesc(Lya), from 10% to 40%. | result 1.00 | 0.97 | 0.08 | asserted 1.00 |
| s3 | Large EW(Lya) and fesc(Lya) are found predominantly in LAEs showing weak low-ionization ISM absorption (EW < 1\AA) and narrow Lya profiles (< 300 km s-1 FWHM) with their peak close (< 80 km s-1) to their systemic redshifts, suggestive of less scatter from low HI column densities that favours the escape of Lya photons. | result 0.57 | 0.94 | 0.10 | asserted 0.53 |
| s4 | We infer stellar metallicities of Z/Zsun ~ 0.2 in almost all LAEs by comparing the P-Cygni profiles of the wind lines NV1240\AA and CIV1549\AA with those from stellar synthesis models. | result 0.98 | 0.97 | 0.07 | asserted 0.97 |
| s5 | We also find a trend between M(UV) and the velocity offset of ISM absorption lines, such as the most luminous LAEs experience stronger outflows. | result 0.99 | 0.95 | 0.08 | asserted 0.99 |
| s6 | The most luminous LAEs show star formation rates up to 180 Msun yr-1, yet they appear relatively blue ($\beta$(UV) ~ -1.8 to -2.0) showing evidence of little dust attenuation (E(B-V) = 0.10-0.14). | result 0.99 | 0.94 | 0.11 | asserted 0.97 |
| s7 | These luminous LAEs may be particular cases of young starburst galaxies that have had no time to form large amounts of dust. | interpretation 1.00 | 0.20 | 0.13 | hedged possibility 0.99 |
| s8 | If so, they are ideal laboratories to study the early phase of massive star formation, stellar and dust mass growth, and chemical enrichment histories of starburst galaxies at high-z. | interpretation 0.60 | 0.12 | 0.10 | hedged possibility 0.75 |
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The paper
Original abstract
We present deep rest-frame UV spectroscopic observations using the Gran Telescopio Canarias of six gravitationally lensed Lya emitters (LAEs) at $2.36<z<2.82$ selected from the BELLS GALLERY survey. By taking the magnifications into account, we show that LAEs can be as luminous as L(Lya) = 30x10$^{42}$ erg s-1 and M(UV) = -23 (AB) without invoking an AGN component, in contrast with previous findings. We measure Lya rest-frame equivalent widths, EW(Lya), ranging from 16\AA to 50\AA and Lya escape fractions, fesc(Lya), from 10% to 40%. Large EW(Lya) and fesc(Lya) are found predominantly in LAEs showing weak low-ionization ISM absorption (EW < 1\AA) and narrow Lya profiles (< 300 km s-1 FWHM) with their peak close (< 80 km s-1) to their systemic redshifts, suggestive of less scatter from low HI column densities that favours the escape of Lya photons. We infer stellar metallicities of Z/Zsun ~ 0.2 in almost all LAEs by comparing the P-Cygni profiles of the wind lines NV1240\AA and CIV1549\AA with those from stellar synthesis models. We also find a trend between M(UV) and the velocity offset of ISM absorption lines, such as the most luminous LAEs experience stronger outflows. The most luminous LAEs show star formation rates up to 180 Msun yr-1, yet they appear relatively blue ($\beta$(UV) ~ -1.8 to -2.0) showing evidence of little dust attenuation (E(B-V) = 0.10-0.14). These luminous LAEs may be particular cases of young starburst galaxies that have had no time to form large amounts of dust. If so, they are ideal laboratories to study the early phase of massive star formation, stellar and dust mass growth, and chemical enrichment histories of starburst galaxies at high-z.
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Builds on 1 paper
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We also re-observed BG1429+1202, discussed already in [ref] [ref] , this time with higher spectral resolution and deeper imaging.
Constraining the metallicities, ages, star formation histories, and ionizing continua of extragalactic massive star populations · Sample Selection · 0.83
Compares with 2 papers
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In order to put the BELLS GALLERY LAEs into context, we compare their luminosities with other $z ∼2 - 3$ LAEs selected from dedicated $1-4 deg^2$ wide narrow-band surveys with spectroscopic follow-up [ref] .
The nature of luminous Lyman-alpha emitters at z~2-3: maximal dust-poor starbursts and highly ionising AGN · The nature of luminous LAEs · 0.96
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In addition, our galaxies show steep rest-frame UV slopes ($β_UV = -1.7 ±0.2$), suggesting low dust content, and stellar metallicities of $Z_*/Z_⊙ ≃0.2$ (see Section [ref]) similar to those inferred in other LAEs [ref] , but slightly lower than in the more evolved LBG population [ref] .
Constraining the metallicities, ages, star formation histories, and ionizing continua of extragalactic massive star populations · The origin of large $EW_0 (Lyα$) and $f_esc (Lyα$) · 0.96
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