A GEOMETRICALLY SUPPORTED z ∼ 10 CANDIDATE MULTIPLY IMAGED BY THE HUBBLE FRONTIER FIELDS CLUSTER A2744

Journal Article · Sat Sep 20 04:00:00 EDT 2014 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/793/1/L12· OSTI ID:22365002

Zitrin, Adi ^[1]; Zheng, Wei; Huang, Xingxing; Ford, Holland ^[2]; Broadhurst, Tom ^[3]; Moustakas, John ^[4]; Lam, Daniel; Lim, Jeremy ^[5]; Shu, Xinwen ^[6]; Diego, Jose M. ^[7]; Bauer, Franz E.; Infante, Leopoldo ^[8]; Kelson, Daniel D. ^[9]; Molino, Alberto ^[10]

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1. Cahill Center for Astronomy and Astrophysics, California Institute of Technology, MS 249-17, Pasadena, CA 91125 (United States)
2. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 (United States)
3. Department of Theoretical Physics, University of Basque Country UPV/EHU, Bilbao (Spain)
4. Department of Physics and Astronomy, Siena College, Loudonville, NY 12211 (United States)
5. Department of Physics, The University of Hong Kong, Pokfulam Road (Hong Kong)
6. CEA Saclay, DSM/Irfu/Service d'Astrophysique, Orme des Merisiers, F-91191 Gif-sur-Yvette Cedex (France)
7. Instituto de Física de Cantabria, CSIC-Universidad de Cantabria, E-39005 Santander (Spain)
8. Pontificia Universidad Católica de Chile, Instituto de Astrofísica, Santiago 22 (Chile)
9. The Observatories of the Carnegie Institution for Science, Pasadena, CA 91101 (United States)
10. Instituto de Astrofísica de Andalucía - CSIC, Glorieta de la Astronomía, s/n. E-18008, Granada (Spain)

The deflection angles of lensed sources increase with their distance behind a given lens. We utilize this geometric effect to corroborate the z {sub phot} ≅ 9.8 photometric redshift estimate of a faint near-IR dropout, triply imaged by the massive galaxy cluster A2744 in deep Hubble Frontier Fields images. The multiple images of this source follow the same symmetry as other nearby sets of multiple images that bracket the critical curves and have well-defined redshifts (up to z {sub spec} ≅ 3.6), but with larger deflection angles, indicating that this source must lie at a higher redshift. Similarly, our different parametric and non-parametric lens models all require this object be at z ≳ 4, with at least 95% confidence, thoroughly excluding the possibility of lower-redshift interlopers. To study the properties of this source, we correct the two brighter images for their magnifications, leading to a star formation rate of ∼0.3 M {sub ☉} yr{sup –1}, a stellar mass of ∼4 × 10{sup 7} M {sub ☉}, and an age of ≲ 220 Myr (95% confidence). The intrinsic apparent magnitude is 29.9 AB (F160W), and the rest-frame UV (∼1500 Å) absolute magnitude is M {sub UV,} {sub AB} = –17.6. This corresponds to ∼0.1 L{sub z=8}{sup ∗} (∼0.2 L{sub z=10}{sup ∗}, adopting dM*/dz ∼ 0.45), making this candidate one of the least luminous galaxies discovered at z ∼ 10.

• OSTI ID: 22365002
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 793; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
DIAGRAMS
DISTANCE
GALAXIES
GALAXY CLUSTERS
GRAVITATIONAL LENSES
IMAGES
MASS
RED SHIFT
STAR EVOLUTION
STARS
SYMMETRY