Lyα Emission from Green Peas: The Role of Circumgalactic Gas Density, Covering, and Kinematics

@article{Henry2015LyEF,
  title={Ly$\alpha$ Emission from Green Peas: The Role of Circumgalactic Gas Density, Covering, and Kinematics},
  author={Alaina L. Henry and Claudia Scarlata and Crystal L. Martin and Dawn K. Erb},
  journal={The Astrophysical Journal},
  year={2015},
  volume={809},
  pages={19-19}
}
Author(s): Henry, A; Scarlata, C; Martin, CL; Erb, D | Abstract: i?½ 2015. The American Astronomical Society. All rights reserved.. 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 basis of high equivalent width optical emission lines, the sample, dubbed "Green Peas," make some of the best analogs for young galaxies in an early universe. We detect Ly… 
Puzzling Lyman-alpha line profiles in green pea galaxies
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
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 highly
A Close Relationship between Lyα and Mg II in Green Pea Galaxies
The Mg II 2796,2803 doublet is often used to measure interstellar medium absorption in galaxies, thereby serving as a diagnostic for feedback and outflows. However, the interpretation of Mg II
On the UV compactness and morphologies of typical Lyman α emitters from z ∼ 2 to z ∼ 6
Lyman-a (Lya) is, intrinsically, the strongest nebular emission line in actively star-forming galaxies (SFGs), but its resonant nature and uncertain escape fraction limit its applicability. The
Kinematics and Optical Depth in the Green Peas: Suppressed Superwinds in Candidate LyC Emitters
By clearing neutral gas away from a young starburst, superwinds may regulate the escape of Lyman continuum (LyC) photons from star-forming galaxies. However, models predict that superwinds may not
A High Fraction of Lyα-Emitters Among Galaxies with Extreme Emission Line Ratios at z ~ 2
Star-forming galaxies form a sequence in the [O III] λ5007/Hβ versus [N II] λ6584/Hɑ diagnostic diagram, with low-metallicity, highly ionized galaxies falling in the upper left corner. Drawing from a
HST Emission Line Galaxies at z ~ 2: Comparing Physical Properties of Lyman Alpha and Optical Emission Line Selected Galaxies
We compare the physical and morphological properties of z ~ 2 Lyman-alpha emitting galaxies (LAEs) identified in the HETDEX Pilot Survey and narrow band studies with those of z ~ 2 optical emission
Neutral gas properties of Lyman continuum emitting galaxies: Column densities and covering fractions from UV absorption lines
Context. The processes allowing the escape of ionizing photons from galaxies into the intergalactic medium are poorly known. Aims. To understand how Lyman continuum (LyC) photons escape galaxies, we
From Mirrors to Windows: Lyman-Alpha Radiative Transfer in a Very Clumpy Medium
Lyman-Alpha (Ly$\alpha$) is the strongest emission line in the Universe and is frequently used to detect and study the most distant galaxies. Because Lya is a resonant line, photons typically scatter
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
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 89 REFERENCES
Lyα Escape from z ~ 0.03 Star-forming Galaxies: The Dominant Role of Outflows
The usefulness of H I Ly? photons for characterizing star formation in the distant universe is limited by our understanding of the astrophysical processes that regulate their escape from galaxies.
Diffuse Lyα Emitting Halos: A Generic Property of High-redshift Star-forming Galaxies
Using a sample of 92 UV continuum-selected, spectroscopically identified galaxies with langzrang = 2.65, all of which have been imaged in the Lyα line with extremely deep narrow-band imaging, we
Lyα EMITTING GALAXIES AS EARLY STAGES IN GALAXY FORMATION
We present optical spectroscopy of two samples of Galaxy Evolution Explorer grism selected Ly{alpha} emitters (LAEs): one at z = 0.195-0.44 and the other at z = 0.65-1.25. We have also observed a
EXTENDED Lyα EMISSION AROUND STAR-FORMING GALAXIES
Ly? photons that escape the interstellar medium of star-forming galaxies may be resonantly scattered by neutral hydrogen atoms in the circumgalactic and intergalactic media, thereby increasing the
Rest-Frame Ultraviolet Spectra of z ∼ 3 Lyman Break Galaxies*
We present the results of a systematic study of the rest-frame UV spectroscopic properties of Lyman break galaxies (LBGs). The database of almost 1000 LBG spectra proves useful for constructing high
The Lyman Alpha Reference Sample: Extended Lyman Alpha Halos Produced at Low Dust Content
We report on new imaging observations of the Lyman alpha emission line (Lyα), performed with the Hubble Space Telescope, that comprise the backbone of the Lyman alpha Reference Sample. We present
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 Magellan IMACS Spectroscopic Search for Lyα-emitting Galaxies at Redshift 5.7
We present results from a blind, spectroscopic survey for -->z ~ 5.7 Lyα-emitting galaxies (LAEs) using the Inamori Magellan Areal Camera and Spectrograph. A total of ~200 arcmin2 were observed in
What is the physical origin of strong Lya emission? II. Gas Kinematics and Distribution of Lya Emitters
We present a statistical study of velocities of Lya, interstellar (IS) absorption, and nebular lines and gas covering fraction for Lya emitters (LAEs) at z~2. We make a sample of 22 LAEs with a large
LINKING Lyα AND LOW-IONIZATION TRANSITIONS AT LOW OPTICAL DEPTH
We suggest that low optical depth in the Lyman continuum (LyC) may relate the Lyα emission, C II and Si II absorption, and C II* and Si II* emission seen in high-redshift galaxies. We base this
...
1
2
3
4
5
...