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29 March 2024 |
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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 | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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