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  Investigating the physical properties of galaxies in the Epoch of Reionization with MIRI/JWST spectroscopy

Álvarez-Márquez, J., Colina, L., Marques-Chaves, R., Ceverino, D., Alonso-Herrero, A., Caputi, K., et al. (2019). Investigating the physical properties of galaxies in the Epoch of Reionization with MIRI/JWST spectroscopy. Astronomy and Astrophysics, 629.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-D1FA-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-D1FB-4
Genre: Journal Article

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Álvarez-Márquez, J.1, Author
Colina, L.1, Author
Marques-Chaves, R.1, Author
Ceverino, D.1, Author
Alonso-Herrero, A.1, Author
Caputi, K.1, Author
García-Marín, M.1, Author
Labiano, A.1, Author
Le Fèvre, O.1, Author
Norgaard-Nielsen, H. U.1, Author
Östlin, G.1, Author
Pérez-González, P. G.1, Author
Pye, J. P.1, Author
Tikkanen, T. V.1, Author
van der Werf, P. P.1, Author
Walter, F.1, Author
Wright, G. S.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: high-redshift galaxies: formation galaxies: evolution infrared: galaxies telescopes Astrophysics - Astrophysics of Galaxies
 Abstract: The James Webb Space Telescope (JWST) will provide deep imaging and spectroscopy for sources at redshifts above 6, covering the entire Epoch of Reionization (EoR, 6 < z < 10), and enabling the detailed exploration of the nature of the different sources during the first 1 Gyr of the history of the Universe. The Medium Resolution Spectrograph (MRS) of the mid-IR Instrument (MIRI) will be the only instrument on board JWST able to observe the brightest optical emission lines HŒ± and [OIII]0.5007 Œºm at redshifts above 7 and 9, respectively, providing key insights into the physical properties of sources during the early phases of the EoR. This paper presents a study of the HŒ± fluxes predicted by state-of-the-art FIRSTLIGHT cosmological simulations for galaxies at redshifts of 6.5-10.5, and its detectability with MIRI. Deep (40 ks) spectroscopic integrations with MRS will be able to detect (signal-to- noise ratio > 5) EoR sources at redshifts above 7 with intrinsic star formation rates (SFR) of more than 2 M‚òâ yr-1, and stellar masses above 4-9 107 M‚òâ. These limits cover the upper end of the SFR and stellar mass distribution at those redshifts, representing ~6% and ~1% of the predicted FIRSTLIGHT population at the 6.5-7.5 and 7.5-8.5 redshift ranges, respectively. In addition, the paper presents realistic MRS simulated observations of the expected rest-frame optical and near-infrared spectra for some spectroscopically confirmed EoR sources recently detected by ALMA as [OIII]88 Œºm emitters. The MRS simulated spectra cover a wide range of low metallicities from about 0.2-0.02 Z‚òâ, and different [OIII]88 Œºm/[OIII]0.5007 Œºm line ratios. The simulated 10 ks MRS spectra show S/N in the range of 5-90 for HŒ≤, [OIII]0.4959,0.5007 Œºm, HŒ± and HeI1.083 Œºm emission lines of the currently highest spectroscopically confirmed EoR (lensed) source MACS1149-JD1 at a redshift of 9.11, independent of metallicity. In addition, deep 40 ksec simulated spectra of the luminous merger candidate B14-65666 at 7.15 shows the MRS capabilities of detecting, or putting strong upper limits on, the weak [NII]0.6584 Œºm, [SII]0.6717,0.6731 Œºm, and [SIII]0.9069,0.9532 Œºm emission lines. These observations will provide the opportunity of deriving accurate metallicities in bright EoR sources using the full range of rest-frame optical emission lines up to 1 Œºm. In summary, MRS will enable the detailed study of key physical properties such as internal extinction, instantaneous star formation, hardness of the ionizing continuum, and metallicity in bright (intrinsic or lensed) EoR sources.

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 Dates: 2019
 Publication Status: Published in print
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 629 Sequence Number: - Start / End Page: - Identifier: -