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Ly alpha emission f...
Ly alpha emission from galaxies in the Epoch of eionization
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- Behrens, C. (författare)
- Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.
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- Pallottini, A. (författare)
- Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.;Museo Stor Fis, Ctr Fermi, Piazza Viminale 1, I-00184 Rome, Italy.;Ctr Studi & Ric Enrico Fermi, Piazza Viminale 1, I-00184 Rome, Italy.;Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England.;Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England.
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- Ferrara, A. (författare)
- Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.;Univ Tokyo, Kavli IPMU, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778583, Japan.
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- Gallerani, S. (författare)
- Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.
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- Vallini, Livia (författare)
- Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Leiden University, the Netherlands,Nordita SU
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Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy Scuola Normale Super Pisa, Piazza Cavalieri 7, I-56126 Pisa, Italy.;Museo Stor Fis, Ctr Fermi, Piazza Viminale 1, I-00184 Rome, Italy.;Ctr Studi & Ric Enrico Fermi, Piazza Viminale 1, I-00184 Rome, Italy.;Univ Cambridge, Cavendish Lab, 19 JJ Thomson Ave, Cambridge CB3 0HE, England.;Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England. (creator_code:org_t)
- 2019-04-05
- 2019
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 486:2, s. 2197-2209
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Ämnesord
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- The intrinsic strength of the Ly alpha line in young, star-forming systems makes it a special tool for studying high-redshift galaxies. However, interpreting observations remains challenging due to the complex radiative transfer involved. Here, we combine state-of-the-art hydrodynamical simulations of 'Althaea', a prototypical Lyman Break Galaxy (LBG; stellar mass M-star similar or equal to 10(10) M-circle dot) at z = 7.2, with detailed radiative transfer computations of dust/continuum, [C II] 158 mu m, and Ly alpha to clarify the relation between the galaxy properties and its Ly alpha emission. Althaea exhibits low (f(alpha) < 1 per cent) Ly alpha escape fractions and equivalent widths, EW less than or similar to 6 angstrom for the simulated lines of sight, with a large scatter. The correlation between escape fraction and inclination is weak, as a result of the rather chaotic structure of high-redshift galaxies. Low f(alpha) values persist even if we artificially remove neutral gas around star-forming regions to mimic the presence of H II regions. The high attenuation is primarily caused by dust clumps co-located with young stellar clusters. We can turn Althaea into a Lyman Alpha Emitter (LAE) only if we artificially remove dust from the clumps, yielding EWs up to 22 angstrom. Our study suggests that the LBG-LAE duty-cycle required by recent clustering measurements poses the challenging problem of a dynamically changing dust attenuation. Finally, we find an anticorrelation between the magnitude of Ly alpha-[C II] line velocity shift and Ly alpha luminosity.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- radiative transfer
- galaxies: high-redshift
- (cosmology:) dark ages
- reionization
- first stars
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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