Details

Autor(en) / Beteiligte

• Atek, Hakim
• Richard, Johan
• Jauzac, Mathilde
• Kneib, Jean-Paul
• Natarajan, Priyamvada
• Limousin, Marceau
• Schaerer, Daniel
• Jullo, Eric
• Ebeling, Harald
• Egami, Eiichi
• Clement, Benjamin

Titel

ARE ULTRA-FAINT GALAXIES AT z = 6–8 RESPONSIBLE FOR COSMIC REIONIZATION? COMBINED CONSTRAINTS FROM THE HUBBLE FRONTIER FIELDS CLUSTERS AND PARALLELS

Ist Teil von

• The Astrophysical journal, 2015-11, Vol.814 (1), p.1-14

Ort / Verlag

United Kingdom: American Astronomical Society

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We use deep Hubble Space Telescope imaging of the Frontier Fields to accurately measure the galaxy rest-frame ultraviolet luminosity function (UV LF) in the redshift range z ~ 6-8. We combine observations in three lensing clusters, A2744, MACS 0416, and MACS 0717, and their associated parallel-fields to select high-redshift dropout candidates. We use the latest lensing models to estimate the flux magnification and the effective survey volume in combination with completeness simulations performed in the source plane. We report the detection of 227 galaxy candidates at z = 6-7 and 25 candidates at z ~ 8. We compute the UV LF at z ~ 7 using the combined galaxy sample and perform Monte Carlo simulations to determine the best-fit Schechter parameters. Fields observations will certainly improve the constraints on the UV LF at the epoch of re-ionization, paving the way to more ambitious programs using cosmic telescopes with the next generation of large aperture telescopes such as the James Webb Space Telescope and the European Extremely Large Telescope.