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Conditions for dete...
Conditions for detecting lensed Population III galaxies in blind surveys with the James Webb Space Telescope, the Roman Space Telescope, and Euclid
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- Vikaeus, Anton (författare)
- Uppsala universitet,Observationell astrofysik
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- Zackrisson, Erik (författare)
- Uppsala universitet,Observationell astrofysik
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- Schaerer, Daniel (författare)
- Univ Geneva, Geneva Observ, Chemin Pegasi 51, CH-1290 Versoix, Switzerland.;IRAP, CNRS, 14 Ave E Belin, F-31400 Toulouse, France.
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visa fler...
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- Visbal, Eli (författare)
- Univ Toledo, Dept Phys & Astron, 2801 Bancroft, Toledo, OH 43606 USA.;Univ Toledo, Ritter Astrophys Res Ctr, 2801 Bancroft, Toledo, OH 43606 USA.
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- Fransson, Emma (författare)
- Uppsala universitet,Observationell astrofysik
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- Malhotra, Sangeeta (författare)
- NASA, Astrophys Sci Div, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA.
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- Rhoads, James (författare)
- NASA, Astrophys Sci Div, Goddard Space Flight Ctr, 8800 Greenbelt Rd, Greenbelt, MD 20771 USA.
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- Sahlén, Martin, Associate Professor (docent), 1979- (författare)
- Uppsala universitet,Kollegiet för avancerade studier (SCAS),Teoretisk astrofysik
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(creator_code:org_t)
- 2022-02-23
- 2022
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 512:2, s. 3030-3044
- Relaterad länk:
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https://doi.org/10.1...
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https://doi.org/10.4...
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https://uu.diva-port... (primary) (Raw object)
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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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Abstract
Ämnesord
Stäng
- Dark matter haloes that reach the H i-cooling mass without prior star formation or external metal pollution represent potential sites for the formation of small - extremely faint - Population III galaxies at high redshifts. Gravitational lensing may in rare cases boost their fluxes to detectable levels, but to find even a small number of such objects in randomly selected regions of the sky requires very large areas to be surveyed. Because of this, a small, wide-field telescope can in principle offer better detection prospects than a large telescope with a smaller field of view. Here, we derive the minimum comoving number density required to allow gravitational lensing to lift such objects at redshift z = 5-16 above the detection thresholds of blind surveys carried out with the James Webb space telescope (JWST), the Roman space telescope (RST) and Euclid. We find that the prospects for photometric detections of Pop III galaxies are promising, and that they are better for RST than for JWST and Euclid. However, the Pop III galaxies favoured by current simulations have number densities too low to allow spectroscopic detections based on the strength of the He ii1640 emission line in any of the considered surveys unless very high star formation efficiencies (epsilon greater than or similar to 0.1) are evoked. We argue that targeting individual cluster lenses instead of the wide-field surveys considered in this paper results in better spectroscopic detection prospects, while for photometric detection, the wide-field surveys perform considerably better.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- gravitational lensing: strong
- techniques: photometric
- techniques: spectroscopic
- stars: Population III
- Dark ages
- reionization
- first stars
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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