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Expanded Search for z ∼ 10 Galaxies from HUDF09, ERS, and CANDELS Data: Evidence for Accelerated Evolution at z > 8?

  • Authors: P. A. Oesch, R. J. Bouwens, G. D. Illingworth, I. Labbé, M. Trenti, V. Gonzalez, C. M. Carollo, M. Franx, P. G. van Dokkum, and D. Magee

Oesch et al. 2012 The Astrophysical Journal 745 110.

  • Provider: AAS Journals

Caption: Figure 10.

Images of all optical undetected sources with J 125H 160 > 1.2 mag, but with strong IRAC detections. This rules out the possibility that these sources are at z > 9. The images are 7.5 arcsec on a side and show from left to right (1) a stack of B 435, V 606, i 775, z 850, (2) J 125, (3) H 160, (4) Spitzer IRAC [3.6], and (5) IRAC [8.0]. All these sources are clearly detected in all IRAC bands, including [8.0]. Thus, their H 160 − [8.0] colors are greater than ~2, which are very different from the relatively flat color expected for a real z ~ 10 source. Note that IRAC flux of the source jD-2080646581 is heavily contaminated by neighboring sources. In the [3.6] band, we therefore show the cleaned image, after subtraction of the contaminating flux, which reveals its clear detection.

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