Puzzling Lyman-alpha line profiles in green pea galaxies

  title={Puzzling Lyman-alpha line profiles in green pea galaxies},
  author={I. Orlitov{\'a} and Anne Verhamme and Alaina L. Henry and Claudia Scarlata and Anne E. Jaskot and Sally Oey and Daniel Schaerer},
  journal={Astronomy \& Astrophysics},
Context. The Lyman-alpha (Lyα) line of hydrogen is of prime importance for detecting galaxies at high redshift. For a correct data interpretation, numerical radiative transfer models are necessary due to Lyα resonant scattering off neutral hydrogen atoms. Aims. Recent observations have discovered an escape of ionizing Lyman-continuum radiation from a population of compact, actively star-forming galaxies at redshift z ~ 0.2−0.3, also known as “green peas”. For the potential similarities with… 
The physics of Lyman α escape from high-redshift galaxies
Lyman-alpha (Ly{\alpha}) photons from ionizing sources and cooling radiation undergo a complex resonant scattering process that generates unique spectral signatures in high-redshift galaxies. We
New Insights on Lyα and Lyman Continuum Radiative Transfer in the Greenest Peas
As some of the only Lyman continuum (LyC) emitters at z ∼ 0, Green Pea (GP) galaxies are possible analogs of the sources that reionized the universe. We present HST COS spectra of 13 of the most
Chemodynamics of green pea galaxies – I. Outflows and turbulence driving the escape of ionizing photons and chemical enrichment
We investigate the ionized gas kinematics, physical properties, and chemical abundances of Sloan Digital Sky Survey J142947, a Green Pea galaxy at redshift z∼ 0.17 with strong, double-peak Ly α
The Importance of Star Formation Intensity in Lyα Escape from Green Pea Galaxies and Lyman Break Galaxy Analogs
We have studied ultraviolet images of 40 Green Pea galaxies and 15 local Lyman Break Galaxy Analogs to understand the relation between Lyα photon escape and central UV photometric properties. We
The Low-redshift Lyman Continuum Survey. I. New, Diverse Local Lyman Continuum Emitters
The origins of Lyman continuum (LyC) photons responsible for the reionization of the universe are as of yet unknown and highly contested. Detecting LyC photons from the Epoch of Reionization is not
Lyman continuum leakage in faint star-forming galaxies at redshift z = 3−3.5 probed by gamma-ray bursts
Context. The identification of the sources that reionized the Universe and their specific contribution to this process are key missing pieces of our knowledge of the early Universe. Faint
The Compact UV Size of Green Pea Galaxies As Local Analogs of High-redshift Lyα-Emitters
We study the dependence of Lyα escape from galaxies on UV continuum size and luminosity using a sample of 40 Green Pea (GP) galaxies, which are the best local analogs of high-redshift Lyα emitters
Resolved Lyman-α properties of a luminous Lyman-break galaxy in a large ionized bubble at z = 6.53
The observed properties of the Lyman-α (Ly α) emission line are a powerful probe of neutral gas in and around galaxies. We present spatially resolved Ly α spectroscopy with VLT/MUSE targeting VR7,
Can Galaxy Evolution Mimic Cosmic Reionization?
Lyα emitting galaxies are powerful tools to probe the late stages of cosmic reionization. The observed sudden drop in Lyα fraction at z > 6 is often interpreted as a sign of reionization, since the
Lyα Radiative Transfer: Modeling Spectrum and Surface Brightness Profiles of Lyα-emitting Galaxies at Z = 3–6
We perform Lyα radiative transfer calculations to reproduce the Lyα properties of star-forming galaxies at high redshifts. We model a galaxy as a halo in which the density distributions of Lyα


Lyman Alpha Emitting Galaxies in the Nearby Universe
  • M. Hayes
  • Physics
    Publications of the Astronomical Society of Australia
  • 2015
Abstract The Lyman alpha emission line (Lyα) of neutral hydrogen (Hi) is intrinsically the brightest emission feature in the spectrum of astrophysical nebulae, making it a very attractive
Lyα Emission from Green Peas: The Role of Circumgalactic Gas Density, Covering, and Kinematics
We report Hubble Space Telescope/Cosmic Origins Spectrograph observations of the Lyα emission and interstellar absorption lines in a sample of 10 star-forming galaxies at z ∼ 0.2. Selected on the
Lyman-α spectral properties of five newly discovered Lyman continuum emitters
Aims. We have recently reported the discovery of five low redshift Lyman continuum (LyC) emitters (LCEs) with absolute escape fractions f esc LyC that range from 6 to 13%, higher than previously
Lyman-alpha (Lyα) is the strongest emission line in the universe and is frequently used to detect and study the most distant galaxies. Because Lyα is a resonant line, photons typically scatter prior
Lyman α line and continuum radiative transfer in a clumpy interstellar medium
This thesis focuses on the intrinsically strongest spectral signature of star-forming galaxies: the Lyman alpha recombination line of the hydrogen atom (hereafter Lya). Located at the wavelength of
The origin and optical depth of ionizing radiation in the "green pea" galaxies
Although Lyman-continuum (LyC) radiation from star-forming galaxies likely drove the reionization of the universe, observations of star-forming galaxies at low redshift generally indicate low LyC
A population of early star-forming galaxies is the leading candidate for the re-ionization of the universe. It is still unclear, however, what conditions and physical processes would enable a
The Lyman alpha reference sample VI. Lyman alpha escape from the edge-on disk galaxy Mrk 1486
Context. Recent numerical simulations suggest that the strength of the Lyman alpha (Ly alpha) line of star-forming disk galaxies strongly depends on the inclination at which they are observed: from
Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies
Following our first detection reported in Izotov et al. (2016), we present the detection of Lyman continuum (LyC) radiation of four other compact star-forming galaxies observed with the Cosmic
Lyman-α emission properties of simulated galaxies: interstellar medium structure and inclination effects
Aims. This paper is the first of a series investigating Lyman-alpha (hereafter Ly ) radiation transfer through hydrodynamical simulations of galaxy formation. Its aim is to assess the impact of the