CANDELSz7: a large spectroscopic survey of CANDELS galaxies in the reionization epoch

Journal
Date Issued
2018
Author(s)
•
•
•
•
De Barros, S.
•
•
•
Bradac, M.
•
Conselice, C. J.
•
•
Dickinson, M.
•
Finkelstein, S. L.
•
•
Guaita, L.
•
Koekemoer, A. M.
•
Maiolino, R.
•
•
Tilvi, V.
DOI
Abstract
We present the results of CANDELSz7, a European Southern Observatory (ESO) Large Program aimed at spectroscopically confirming 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 h to reach a Lyα flux limit of approximately 1 - 3 × 10-18 erg s-1 cm-2 at 3σ. We could determine a spectroscopic redshift for about 40% of the galaxies, mainly through the detection of a single emission line that we interpret as Lyα emission, or for some of the brightest objects (H160 ≤ 25.5) from the presence of faint continuum and a sharp drop that we interpret as a Lyα 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 Lyα 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.
Volume
619
Start page
A147
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2018A&A...619A.147P
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

aa32465-17.pdf

Description
Pdf editoriale
Size

3.12 MB

Format

Adobe PDF

Checksum (MD5)

be7d859df2ae73790fd17a3ecfec24a0