Bibcode
Laporte, N.; Infante, L.; Troncoso Iribarren, P.; Zheng, W.; Molino, A.; Bauer, F. E.; Bina, D.; Broadhurst, Tom; Chilingarian, I.; Garcia, S.; Kim, S.; Marques-Chaves, R.; Moustakas, J.; Pelló, R.; Pérez-Fournon, I.; Shu, X.; Streblyanska, A.; Zitrin, A.
Referencia bibliográfica
The Astrophysical Journal, Volume 820, Issue 2, article id. 98, 20 pp. (2016).
Fecha de publicación:
4
2016
Revista
Número de citas
58
Número de citas referidas
51
Descripción
In this paper we present the results of our search for and study of
z≳ 6 galaxy candidates behind the third Frontier Fields (FFs)
cluster, MACS J0717.5+3745, and its parallel field, combining data from
Hubble and Spitzer. We select 39 candidates using the Lyman break
technique, for which the clear non-detection in optical make the extreme
mid-z interlopers hypothesis unlikely. We also take benefit from z≳
6 samples selected using the previous FF data sets of Abell 2744 and
MACS 0416 to improve the constraints on the properties of very high
redshift objects. We compute the redshift and the physical properties
such emission lines properties, star formation rate, reddening, and
stellar mass for all FF objects from their spectral energy distribution
using templates including nebular emission lines. We study the
relationship between several physical properties and confirm the trend
already observed in previous surveys for evolution of star formation
rate with galaxy mass and between the size and the UV luminosity of our
candidates. The analysis of the evolution of the UV luminosity function
with redshift seems more compatible with an evolution of density.
Moreover, no robust z≥slant 8.5 object is selected behind the cluster
field and few z∼ 9 candidates have been selected in the two previous
data sets from this legacy survey, suggesting a strong evolution in the
number density of galaxies between z∼ 8 and 9. Thanks to the use of
the lensing cluster, we study the evolution of the star formation rate
density produced by galaxies with L > 0.03 {L}\star , and
confirm the strong decrease observed between z∼ 8 and 9.