Infante, L;
Zheng, W;
Laporte, N;
Troncoso Iribarren, P;
Molino, A;
Diego, JM;
Bauer, FE;
... Kim, S; + view all
(2015)
Young Galaxy Candidates in the Hubble Frontier Fields. II. MACS J0416–2403.
The Astrophysical Journal
, 815
(1)
p. 18.
10.1088/0004-637X/815/1/18.
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Abstract
We searched for z gsim 7 Lyman-break galaxies in the optical-to-mid-infrared Hubble Frontier Field and associated parallel field observations of the strong-lensing cluster MACS J0416−2403. We discovered 22 candidates, of which 6 lie at z gsim 9 and 1 lies at z gsim 10. Based on the Hubble and Spitzer photometry, all have secure photometric redshifts and a negligible probability of being at lower redshifts according to their peak-probability ratios, ${\mathcal{R}}$. This substantial increase in the number of known high-redshift galaxies allows a solid determination of the luminosity function (LF) at z gsim 8. The number of high-z candidates in the parallel field is considerably higher than that in the Abell 2744 parallel field. Our candidates have median stellar masses of $\mathrm{log}({M}_{*})\sim {8.44}_{-0.31}^{+0.55}$ M⊙, star formation rates (SFRs) of $\sim {1.8}_{-0.4}^{+0.5}$ M⊙ yr−1, and SFR-weighted ages of $\lesssim {300}_{-140}^{+70}\;\mathrm{Myr}$. Finally, we are able to put strong constraints on the z = 7, 8, 9, and 10 LFs. One of the objects in the cluster field is a z sime 10 candidate, with a magnification of μ ~ 20 ± 13. This object is likely the faintest z ~ 10 object known to date, allowing a first look into the extreme faint end (L ~ 0.04 L*) of the z ~ 10 LF (It is named "Tayna" in the Aymara language).
| Type: | Article |
|---|---|
| Title: | Young Galaxy Candidates in the Hubble Frontier Fields. II. MACS J0416–2403 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/0004-637X/815/1/18 |
| Publisher version: | http://dx.doi.org/10.1088/0004-637X/815/1/18 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1480072 |
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