LARS XIII: High Angular Resolution 21 cm H i Observations of Lyα Emitting Galaxies

Reste, Alexandra Le; Hayes, Matthew; Cannon, John; Herenz, Edmund Christian; Melinder, Jens; Menacho, Veronica; Östlin, Göran; Puschnig, Johannes; Rivera-Thorsen, T. Emil; Kunth, D.; Velikonja, Nick

doi:10.3847/1538-4357/ac77ed

Cited by 6 publications

(4 citation statements)

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“…Dust/metals produced as end products of stellar evolution in the early galaxies provide key constraints to how cosmic star formation would have evolved in the first ∼3 billion years of the universe (e.g., Stark 2016). Thus, establishing a relationship between dust and luminosity in the early universe from UV bright to faint galaxies would provide tight constraints to galaxy evolution and cosmology (e.g Naidu et al 2020;Bouwens et al 2021Bouwens et al , 2022bFinkelstein et al 2022;Le Reste et al 2022;Leethochawalit et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Early Results from GLASS-JWST. XVI. Discovering a Bluer z ∼ 4–7 Universe through UV Slopes

Nanayakkara

Glazebrook

Jacobs

et al. 2023

ApJL

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We use the GLASS-JWST Early Release Science NIRCam parallel observations to provide a first view of the UV continuum properties of NIRCam/F444W selected galaxies at 4 < z < 7. By combining multiwavelength NIRCam observations, we constrain the UV continuum slope for a sample of 401 galaxies with stringent quality controls. We find that >99% of the galaxies are blue star-forming galaxies with very low levels of dust (Av β ∼ 0.01 ± 0.33). We find no statistically significant correlation for UV slope with redshift or UV magnitude. However, we find that in general galaxies at higher redshifts and fainter UV magnitudes have steeper UV slopes. We find a statistically significant correlation for UV slope with stellar mass, with galaxies with higher stellar mass showing shallower UV slopes. Individual fits to some of our galaxies reach the bluest UV slopes of β ∼ −3.1 allowed by stellar population models used in this analysis. Therefore, it is likely that stellar population models with a higher amount of Lyman continuum leakage, active galactic nucleus effects, and/or Population III contributions are required to accurately reproduce the rest-UV and optical properties of some of our bluest galaxies. This dust-free early view confirms that our current cosmological understanding of gradual mass + dust buildup of galaxies with cosmic time is largely accurate to describe the ∼0.7–1.5 Gyr age window of the universe. The abundance of a large population of UV faint dust-poor systems may point to a dominance of low-mass galaxies at z > 6 playing a vital role in cosmic reionization.

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Section: Introductionmentioning

confidence: 99%

Early Results from GLASS-JWST. XVI. Discovering a Bluer z ∼ 4–7 Universe through UV Slopes

Nanayakkara

Glazebrook

Jacobs

et al. 2023

ApJL

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“…One of the leading indicators is the Lyα emission (e.g., Henry et al 2015;Verhamme et al 2015;Dijkstra et al 2016;Verhamme et al 2017;Jaskot et al 2019;Gazagnes et al 2020;Kakiichi & Gronke 2021;Izotov et al 2022). Given the resonance nature of Lyα, the escape of Lyα photons contains information about the neutral hydrogen in/around the galaxy, and leaves footprints on the Lyα emission line profiles (e.g., Izotov et al 2018b;Gazagnes et al 2020;Flury et al 2022b;Le Reste et al 2022). Nonetheless, since Lyα photons can also be absorbed by the neutral IGM, the interpretation of Lyα profiles for high-z galaxies (z 4) is nontrivial (e.g., Stark et al 2011;Schenker et al 2014;Gronke et al 2021;Hayes et al 2021).…”

Section: Introductionmentioning

confidence: 99%

The Low-redshift Lyman Continuum Survey: Optically Thin and Thick Mg ii Lines as Probes of Lyman Continuum Escape

Henry

Heckman

et al. 2023

ApJ

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The Mg ii λλ2796, 2803 doublet has been suggested as a useful indirect indicator for the escape of Lyα and Lyman continuum (LyC) photons in local star-forming galaxies. However, studies to date have focused on small samples of galaxies with strong Mg ii or strong LyC emission. Here, we present the first study of Mg ii to probe a large dynamic range of galaxy properties, using newly obtained high-signal-to-noise, moderate-resolution spectra of Mg ii, for a sample of 34 galaxies selected from the Low-redshift Lyman Continuum Survey. We show that the galaxies in our sample have Mg ii profiles ranging from strong emission to P-Cygni profiles to pure absorption. We find that there is a significant trend (with a possibility of spurious correlations of ∼2%) that galaxies that are detected as strong LyC emitters (LCEs) show larger equivalent widths of Mg ii emission, while non-LCEs tend to show evidence of more scattering and absorption features in Mg ii. We then find that Mg ii strongly correlates with Lyα in both equivalent width and escape fraction, regardless of whether emission or absorption dominates the Mg ii profiles. Furthermore, we show that, for galaxies that are categorized as Mg ii emitters, one can use the information of Mg ii, metallicity, and dust to estimate the escape fraction of LyC within a factor of ∼3. These findings confirm that Mg ii lines can be used as a tool for selecting galaxies as LCEs and thus serve as an indirect indicator for the escape of Lyα and LyC.

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“…One of the leading indicators is the Lyα emission (e.g., Verhamme et al 2015;Henry et al 2015;Dijkstra et al 2016;Verhamme et al 2017;Jaskot et al 2019;Gazagnes et al 2020;Kakiichi & Gronke 2021;Izotov et al 2022). Given the resonance nature of Lyα, the escape of Lyα photons contains information about the neutral hydrogen in/around the galaxy, and leaves footprints on the Lyα emission line profiles (e.g., Izotov et al 2018b;Gazagnes et al 2020;Flury et al 2022b;Le Reste et al 2022). Nonetheless, since Lyα photons can be also absorbed by neutral IGM, the interpretation of Lyα profiles for high-z galaxies (z 4) is non-trivial (e.g., Stark et al 2011;Schenker et al 2014;Gronke et al 2021;Hayes et al 2021).…”

Section: Introductionmentioning

confidence: 99%

The Low-Redshift Lyman Continuum Survey: Optically Thin and Thick Mg II Lines as Probes of Lyman Continuum Escape

Xu¹,

Henry²,

Heckman³

et al. 2023

Preprint

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The Mg II λλ2796, 2803 doublet has been suggested to be a useful indirect indicator for the escape of Lyα and Lyman continuum (LyC) photons in local star-forming galaxies. However, studies to date have focused on small samples of galaxies with strong Mg II or strong LyC emission. Here we present the first study of Mg II probing a large dynamic range of galaxy properties, using newly obtained high signal-to-noise, moderate-resolution spectra of Mg II for a sample of 34 galaxies selected from the Low-redshift Lyman Continuum Survey. We show that the galaxies in our sample have Mg II profiles ranging from strong emission to P-Cygni profiles, and to pure absorption. We find there is a significant trend (with a possibility of spurious correlations of ∼ 2%) that galaxies detected as strong LyC Emitters (LCEs) also show larger equivalent widths of Mg II emission, and non-LCEs tend to show evidence of more scattering and absorption features in Mg II. We then find Mg II strongly correlates with Lyα in both equivalent width and escape fraction, regardless of whether the emission or absorption dominates the Mg II profiles. Furthermore, we present that, for galaxies categorized as Mg II emitters (MgE), one can adopt the information of Mg II, metallicity, and dust to estimate the escape fraction of LyC within a factor of ∼ 3. These findings confirm that Mg II lines can be used as a tool to select galaxies as LCEs and to serve as an indirect indicator for the escape of Lyα and LyC.

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LARS XIII: High Angular Resolution 21 cm H i Observations of Lyα Emitting Galaxies

Cited by 6 publications

References 50 publications

Early Results from GLASS-JWST. XVI. Discovering a Bluer z ∼ 4–7 Universe through UV Slopes

Early Results from GLASS-JWST. XVI. Discovering a Bluer z ∼ 4–7 Universe through UV Slopes

The Low-redshift Lyman Continuum Survey: Optically Thin and Thick Mg ii Lines as Probes of Lyman Continuum Escape

The Low-Redshift Lyman Continuum Survey: Optically Thin and Thick Mg II Lines as Probes of Lyman Continuum Escape

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