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On the evolution of...
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
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- Runnholm, Axel (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Hayes, Matthew J. (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Lin, Yu-Heng (author)
- Minnesota Institute for Astrophysics, School of Physics and Astronomy, University of Minnesota
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- Melinder, Jens, 1977- (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Scarlata, Claudia (author)
- Minnesota Institute for Astrophysics, School of Physics and Astronomy, University of Minnesota
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- Adamo, Angela, 1981- (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Bik, Arjan (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Blaizot, Jérémy (author)
- Univ Lyon, Univ Lyon1, Ens de Lyon, CNRS, Centre de Recherche Astrophysique de Lyon
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- Cannon, John (author)
- Department of Physics and Astronomy, Macalester College
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- Cantalupo, Sebastiano (author)
- Dipartimento di Fisica, Universitá di Milano Bicocca; Institute for Astronomy, ETH Zurich
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- Garel, Thibault (author)
- Department of Astronomy, University of Geneva
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- Gronke, Max (author)
- Max Planck Institut fur Astrophysik
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- Herenz, Edmund (author)
- European Southern Observatory
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- Floriane, Leclecq (author)
- Department of Astronomy, The University of Texas at Austin
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- Östlin, Göran (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Peroux, Celine (author)
- European Southern Observatory; Aix Marseille Université, CNRS
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- Rasekh, Armin (author)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
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- Rutkowski, Michael (author)
- Department of Physics and Astronomy, Minnesota State University
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- Verhamme, Anne (author)
- Department of Astronomy, University of Geneva
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- Wisotzki, Lutz (author)
- Leibniz-Institut für Astrophysik Potsdam (AIP)
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- English.
- Related links:
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https://urn.kb.se/re...
Abstract
Subject headings
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- Lyman ? (Ly?) is now routinely used as a tool for detecting high redshift galaxies and its resonant nature means it can trace neutral hydrogen around star-forming galaxies. Integral field spectrograph measurements of high-? Ly? emitters indicate that significant extended Ly? halo emission is ubiquitous around such objects. We present a sample of redshift 0.23 to 0.32 galaxies observed with the Hubble Space Telescope selected to match the star formation properties of high-? samples while optimizing the observations for detection of low surface brightness Ly? emission. All seven targets show Ly? emission, with total escape fractions between 0.7% and 37%, and extended Ly? emission. We find Ly? halo to UV scale length ratios around 10:1, and halo flux fractions between 60% and 85% —consistent with high redshift observations—when using comparable methods. However, our targets show additional extended stellar UV emission which we parametrize with a new three exponential component model for Ly? emission. Halo fractions become much smaller with this methodology and some become consistent with zero. Comparing UV and H? emission reveals that H? is also extended and can partially explain the origin of diffuse Ly?. We interpret this as evidence that the creation of Ly? halos cannot be attributed to one single process but rather a combination of in-situ recombination and spatial scattering or possibly collisional excitation. We discuss our results in the context of high-redshift galaxies, evolutionary studies of the circumgalactic medium in emission, and inferences concerning the emission of ionizing radiation.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- Astronomy
- astronomi
Publication and Content Type
- vet (subject category)
- ovr (subject category)
To the university's database
- By the author/editor
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Runnholm, Axel
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Hayes, Matthew J ...
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Lin, Yu-Heng
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Melinder, Jens, ...
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Scarlata, Claudi ...
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Adamo, Angela, 1 ...
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show more...
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Bik, Arjan
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Blaizot, Jérémy
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Cannon, John
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Cantalupo, Sebas ...
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Garel, Thibault
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Gronke, Max
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Herenz, Edmund
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Floriane, Leclec ...
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Östlin, Göran
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Peroux, Celine
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Rasekh, Armin
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Rutkowski, Micha ...
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Verhamme, Anne
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Wisotzki, Lutz
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- By the university
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Stockholm University