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29 March 2024
 
  » arxiv » 1510.7084

 Article overview


Young Galaxy Candidates in the Hubble Frontier Fields. II. MACS,J0416-2403
Leopoldo Infante ; Wei Zheng ; Nicolas Laporte ; Paulina Troncoso ; Alberto Molino ; Jose M. Diego ; Franz E. Bauer ; Adi Zitrin ; John Moustakas ; Xingxing Huang ; Xinwen Shu ; David Bina ; Gabriel B. Brammer ; Tom Broadhurst ; Holland C. Ford ; Stefano Garcia ; Sam Kim ;
Date 24 Oct 2015
AbstractWe searched for z > 7 Lyman-break galaxies (LBGs) 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 six lie at z > 9 and one lies at z > 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, R. This substantial increase in the number of known high-redshift galaxies allows a solid determination of the luminosity function at z > 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 log(M_*) ~ 8.40^{+0.55}_{-0.31}~Msun, SFRs of ~ 1.6^{+0.5}_{-0.4} Msun yr^-1, and SFR-weighted ages of < 310^{+70}_{-140} Myr. Finally, we are able to put strong constraints on the z = 7,8,9 and 10 luminosity functions. One of the objects in the cluster field is a z ~ 10 candidate, with a magnification of mu ~ 20 +- 13. This object is likely the faintest z ~ 10 object known to date, allowing a first look into the extreme faint-end (L ~ 0.04L*) of the z ~ 10 luminosity function.
Source arXiv, 1510.7084
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