Sökning: onr:"swepub:oai:DiVA.org:su-84800" >
Gravitationally len...
Gravitationally lensed galaxies at 2 < z < 3.5 : direct abundance measurements of Ly alpha emitters
-
Christensen, Lise (författare)
-
- Laursen, Peter (författare)
- Stockholms universitet,Institutionen för astronomi,Oskar Klein-centrum för kosmopartikelfysik (OKC)
-
Richard, Johan (författare)
-
visa fler...
-
Hjorth, Jens (författare)
-
Milvang-Jensen, Bo (författare)
-
Dessauges-Zavadsky, Miroslava (författare)
-
Limousin, Marceau (författare)
-
Grillo, Claudio (författare)
-
Ebeling, Harald (författare)
-
visa färre...
-
(creator_code:org_t)
- 2012-11-20
- 2012
- Engelska.
-
Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 427:3, s. 1973-1982
- Relaterad länk:
-
https://academic.oup...
-
visa fler...
-
https://urn.kb.se/re...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Strong gravitational lensing magnifies the flux from distant galaxies, allowing us to detect emission lines that would otherwise fall below the detection threshold for medium-resolution spectroscopy. Here we present the detection of temperature-sensitive oxygen emission lines from three galaxies at 2 ? z ? 3.5, which enables us to directly determine the oxygen abundances and thereby double the number of galaxies at z > 2 for which this has been possible. The three galaxies have similar to 10?per?cent solar oxygen abundances in agreement with strong emission-line diagnostics. Carbon and nitrogen ratios relative to oxygen are subsolar as expected for young metal-poor galaxies. Two of the galaxies are Lyman a (Lya) emitters with rest-frame equivalent widths of 20 and 40 angstrom, respectively, and their high magnification factors allow us for the first time to gain insight into the physical characteristics of high-redshift Lya emitters. Using constraints from the physical properties of the galaxies, we accurately reproduce their line profiles with radiative transfer models. The models show a relatively small outflow in agreement with the observed small velocity offsets between nebular emission and interstellar absorption lines.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- gravitational lensing: strong
- galaxies: abundances
- galaxies: evolution
- galaxies: high-redshift
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas