Axel Runnholm
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View article: The Ly<i>α</i> and Continuum Origins Survey. I. Survey Description and Ly<i>α</i> Imaging
The Ly<i>α</i> and Continuum Origins Survey. I. Survey Description and Ly<i>α</i> Imaging Open
Understanding the mechanisms driving the escape of ionizing or Lyman continuum (LyC) emission from the interstellar medium of galaxies is necessary to constrain the evolution of reionization and the sources responsible for it. While progre…
View article: The JWST/PASSAGE Survey: Testing Reionization Histories with JWST’s First Unbiased Survey for Ly<i>α</i> Emitters at Redshifts 7.5–9.5
The JWST/PASSAGE Survey: Testing Reionization Histories with JWST’s First Unbiased Survey for Ly<i>α</i> Emitters at Redshifts 7.5–9.5 Open
Ly α emission is one of a few observable features of galaxies that can trace the neutral hydrogen content in the Universe during the Epoch of Reionization (EoR). To accomplish this, we need an efficient way to survey for Ly α emitters (LAE…
View article: The JWST/PASSAGE Survey: Testing Reionization Histories with JWST's First Unbiased Survey for Lyman alpha Emitters at Redshifts 7.5-9.5
The JWST/PASSAGE Survey: Testing Reionization Histories with JWST's First Unbiased Survey for Lyman alpha Emitters at Redshifts 7.5-9.5 Open
Lyman $α$ (Ly$α$) emission is one of few observable features of galaxies that can trace the neutral hydrogen content in the Universe during the Epoch of Reionization (EoR). To accomplish this we need an efficient way to survey for Ly$α$ em…
View article: The Lyman Alpha Reference Sample
The Lyman Alpha Reference Sample Open
Context. The Lyman- α (Ly α ) line of hydrogen is a well-known tracer of galaxies at high redshift. However, the connection between Ly α observables and galaxy properties has not been fully established, limiting the use of the line to prob…
View article: The Lyman Alpha Reference Sample. XVI. Global 21cm HI properties of Lyman-$α$ emitting galaxies
The Lyman Alpha Reference Sample. XVI. Global 21cm HI properties of Lyman-$α$ emitting galaxies Open
The Lyman-$α$ (Lya) line of hydrogen is a well-known tracer of galaxies at high-z. However, the connection between Lya observables and galaxy properties has not fully been established, limiting the use of the line to probe the physics of g…
View article: Glimmers in the Cosmic Dawn: A Census of the Youngest Supermassive Black Holes by Photometric Variability*
Glimmers in the Cosmic Dawn: A Census of the Youngest Supermassive Black Holes by Photometric Variability* Open
We report the first results from a deep near-infrared campaign with the Hubble Space Telescope to obtain late-epoch images of the Hubble Ultra Deep Field, 10–15 yr after the first epoch data were obtained. The main objectives are to search…
View article: The Lyman Alpha Reference Sample XV. Relating Ionised Gas Kinematics with Lyman-$α$ observables
The Lyman Alpha Reference Sample XV. Relating Ionised Gas Kinematics with Lyman-$α$ observables Open
Gas kinematics affect the radiative transfer and escape of hydrogen Lyman-$α$ (Ly$α$) emission from galaxies. We investigate this interplay empirically by relating the ionised gas kinematics of 42 galaxies in the extended Ly$α$ Reference S…
View article: Glimmers in the Cosmic Dawn: A Census of the Youngest Supermassive Black Holes by Photometric Variability
Glimmers in the Cosmic Dawn: A Census of the Youngest Supermassive Black Holes by Photometric Variability Open
We report first results from a deep near infrared campaign with the Hubble Space Telescope to obtain late-epoch images of the Hubble Ultra-Deep Field (HUDF), 10-15 years after the first epoch data were obtained. The main objectives are to …
View article: The Lyα Reference Sample. XIV. Lyα Imaging of 45 Low-redshift Star-forming Galaxies and Inferences on Global Emission
The Lyα Reference Sample. XIV. Lyα Imaging of 45 Low-redshift Star-forming Galaxies and Inferences on Global Emission Open
We present Ly α imaging of 45 low-redshift star-forming galaxies observed with the Hubble Space Telescope. The galaxies have been selected to have moderate to high star formation rates (SFRs) using far-ultraviolet (FUV) luminosity and H α …
View article: On the evolution of the size of Lyman alpha haloes across cosmic time: no change in the circumgalactic gas distribution when probed by line emission
On the evolution of the size of Lyman alpha haloes across cosmic time: no change in the circumgalactic gas distribution when probed by line emission Open
Lyman α (Lyα) is now routinely used as a tool for studying high-redshift galaxies, and its resonant nature means it can trace neutral hydrogen around star-forming galaxies. Integral field spectrograph measurements of high-redshift Lyα emit…
View article: On the evolution of the size of Lyman alpha halos across cosmic time: no change in the circumgalactic gas distribution when probed by line emission
On the evolution of the size of Lyman alpha halos across cosmic time: no change in the circumgalactic gas distribution when probed by line emission Open
Lyman $α$ (Ly$α$) is now routinely used as a tool for studying high-redshift galaxies and its resonant nature means it can trace neutral hydrogen around star-forming galaxies. Integral field spectrograph measurements of high-redshift Ly$α$…
View article: The Lyman $α$ Reference Sample XIV: Lyman $α$ imaging of 45 low redshift star-forming galaxies and inferences on global emission
The Lyman $α$ Reference Sample XIV: Lyman $α$ imaging of 45 low redshift star-forming galaxies and inferences on global emission Open
We present Ly $α$ imaging of 45 low redshift star-forming galaxies observed with the Hubble Space Telescope. The galaxies have been selected to have moderate to high star formation rates using far-ultraviolet (FUV) luminosity and \ha equiv…
View article: Spectral shapes of the Ly α emission from galaxies – II. The influence of stellar properties and nebular conditions on the emergent Ly α profiles
Spectral shapes of the Ly α emission from galaxies – II. The influence of stellar properties and nebular conditions on the emergent Ly α profiles Open
We demonstrate how the stellar and nebular conditions in star-forming galaxies modulate the emission and spectral profile of H i Ly α emission line. We examine the net Ly α output, kinematics, and in particular emission of blueshifted Ly α…
View article: Spectral Shapes of the Lya Emission from Galaxies. II. the influence of stellar properties and nebular conditions on the emergent Lya profiles
Spectral Shapes of the Lya Emission from Galaxies. II. the influence of stellar properties and nebular conditions on the emergent Lya profiles Open
We demonstrate how the stellar and nebular conditions in star-forming galaxies modulate the emission and spectral profile of HI Lya emission line. We examine the net Lya output, kinematics, and in particular emission of blue-shifted Lya ra…
View article: The Lyman Alpha Reference Sample
The Lyman Alpha Reference Sample Open
Aims. We use Hubble Space Telescope data of 45 nearby star-forming galaxies to investigate properties of Lyman-alpha (Ly α ) halos, Ly α morphology, and the star-forming characteristics of galaxies. We study how the morphology of Ly α emis…
View article: Haro 11 – Untying the knots of the nuclear starburst
Haro 11 – Untying the knots of the nuclear starburst Open
Star formation is a clustered process that regulates the structure and evolution of galaxies. We investigate this process in the dwarf galaxy Haro 11, forming stars in three knots (A, B, and C). The exquisite resolution of HST imaging allo…
View article: The Source of Leaking Ionizing Photons from Haro11: Clues from HST/COS Spectroscopy of Knots A, B, and C*
The Source of Leaking Ionizing Photons from Haro11: Clues from HST/COS Spectroscopy of Knots A, B, and C* Open
Understanding the escape of ionizing (Lyman continuum) photons from galaxies is vital for determining how galaxies contributed to reionization in the early universe. While directly detecting the Lyman continuum from high-redshift galaxies …
View article: The source of leaking ionizing photons from Haro11 -- Clues from HST/COS spectroscopy of knots A, B and C
The source of leaking ionizing photons from Haro11 -- Clues from HST/COS spectroscopy of knots A, B and C Open
Understanding the escape of ionizing (Lyman continuum) photons from galaxies is vital for determining how galaxies contributed to reionization in the early universe. While directly detecting Lyman continuum from high redshift galaxies is i…
View article: The Lyman Alpha Spectral Database (LASD)
The Lyman Alpha Spectral Database (LASD) Open
Lyman α (Ly α) emission from star-forming galaxies is an important tool to study a large range of astrophysical questions: it has the potential to carry information about the source galaxy, its nearby circumgalactic medium, and also the su…
View article: Star cluster formation in the most extreme environments: insights from the HiPEEC survey
Star cluster formation in the most extreme environments: insights from the HiPEEC survey Open
We present the Hubble imaging Probe of Extreme Environments and Clusters (HiPEEC) survey. We fit HST NUV to NIR broad-band and H α fluxes to derive star cluster ages, masses, and extinctions and determine the star formation rate (SFR) of s…
View article: The Lyman Alpha Reference Sample. X. Predicting Lyα Output from Star-forming Galaxies Using Multivariate Regression*
The Lyman Alpha Reference Sample. X. Predicting Lyα Output from Star-forming Galaxies Using Multivariate Regression* Open
Understanding the production and escape of Ly α radiation from star-forming galaxies is a long-standing problem in astrophysics. The ability to predict the Ly α luminosity of galaxies would open up new ways of exploring the epoch of reioni…
View article: Legacy ExtraGalactic UV Survey with The Hubble Space Telescope: Stellar Cluster Catalogs and First Insights Into Cluster Formation and Evolution in NGC 628<sup>∗</sup>
Legacy ExtraGalactic UV Survey with The Hubble Space Telescope: Stellar Cluster Catalogs and First Insights Into Cluster Formation and Evolution in NGC 628<sup>∗</sup> Open
We report the large effort that is producing comprehensive high-level young star cluster (YSC) catalogs for a significant fraction of galaxies observed with the Legacy ExtraGalactic UV Survey (LEGUS) Hubble treasury program. We present the…