CANDELSz7: A large spectroscopic survey of CANDELS galaxies in the reionization epoch
Authors
Pentericci, L
Vanzella, E
Castellano, M
Fontana, A
De Barros, S
Grazian, A
Marchi, F
Bradac, M
Conselice, CJ
Cristiani, S
Dickinson, M
Finkelstein, SL
Giallongo, E
Guaita, L
Koekemoer, AM
Maiolino, R
Santini, P
Tilvi, V
Publication Date
2018Journal Title
Astronomy and Astrophysics
ISSN
0004-6361
Publisher
EDP Sciences
Volume
619
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Pentericci, L., Vanzella, E., Castellano, M., Fontana, A., De Barros, S., Grazian, A., Marchi, F., et al. (2018). CANDELSz7: A large spectroscopic survey of CANDELS galaxies in the reionization epoch. Astronomy and Astrophysics, 619 https://doi.org/10.1051/0004-6361/201732465
Abstract
We present the results of CANDELSz7, an ESO large program aimed at confirming
spectroscopically a homogeneous sample of z~6 and z~7 star forming galaxies.
The candidates were selected in the GOODS-South, UDS and COSMOS fields using
the official CANDELS catalogs based on H160-band detections. Standard color
criteria, which were tailored depending on the ancillary multi-wavelength data
available for each field, were applied to select more than 160 candidate
galaxies at z~6 and z~7. Deep medium resolution FORS2 spectroscopic
observations were then conducted with integration times ranging from 12 to 20
hours, to reach a Lyalpha flux limit of approximately 1-3x 10-18 erg/s/cm^2 at
3sigma. For about 40% of the galaxies we could determine a spectroscopic
redshift, mainly through the detection of a single emission line that we
interpret as Lyalpha emission, or for some of the brightest objects (H160<
25.5) from the presence of faint continuum and sharp drop that we interpret as
a Lyman break. In this paper we present the redshifts and main properties of 65
newly confirmed high redshift galaxies. Adding previous proprietary and
archival data we assemble a sample of ~260 galaxies that we use to explore the
evolution of the Lyalpha fraction in Lyman break galaxies and the change in the
shape of the emission line between z~6 and z~7. We also discuss the accuracy of
the CANDELS photometric redshifts in this redshift range.
Keywords
galaxies: high-redshift, galaxies: distances and redshifts, dark ages, reionization, first stars
Sponsorship
STFC
ERC
Funder references
Science and Technology Facilities Council (ST/M001172/1)
European Research Council (695671)
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1051/0004-6361/201732465
This record's URL: https://www.repository.cam.ac.uk/handle/1810/286674
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http://www.rioxx.net/licenses/all-rights-reserved
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