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Detection of a Lensed z$approx$11 Galaxy in the Rest-Optical with Spitzer/IRAC and the Inferred SFR, Stellar Mass, and Physical Size | Daniel Lam
; Rychard J. Bouwens
; Dan Coe
; Adi Zitrin
; Christopher Barber
; Ivo Labbe
; Themiya Nanayakkara
; Megan Donahue
; Renske Smit
; Xinwen Shu
; Ranga-Ram Chary
; John Moustakas
; Mario Nonino
; Daniel D. Kelson
; Tom Broadhurst
; Larry Bradley
; Mauricio Carrasco
; Piero Rosati
; | Date: |
19 Mar 2019 | Abstract: | We take advantage of new 100-hour Spitzer/IRAC observations available for
MACS0647-JD, a strongly lensed $zapprox11$ galaxy candidate, to provide
improved constraints on its physical properties. Probing the physical
properties of galaxies at $z>8$ is challenging due to the inherent faintness of
such sources and the limited wavelength coverage available. Thanks to the high
$approx$2-6$ imes$ lensing magnification of the multiple images of
MACS0647-JD, we can use the sensitive Spitzer/IRAC data to probe the rest-frame
optical fluxes of MACS0647-JD and investigate its physical properties including
the age and the stellar mass. In deriving Spitzer/IRAC fluxes for MACS0647-JD,
great care is taken in coping with the impact of three bright ($approx$8-16
mag) stars in our field to ensure robust results. Assuming a constant star
formation rate, the age, stellar mass, and rest-frame UV slope we estimate for
MACS0647-JD based on a stack of the photometry are log$_{10}$(age/yr) =
8.6$^{+0.1}_{-2.1}$, log$_{10}$(M$_{*}$/M$_{odot}$) = 9.1$^{+0.2}_{-1.4}$, and
$eta = -$1.3$pm$0.6, respectively. We compare our results with expectations
from the EAGLE simulation and find that MACS0647-JD has properties consistent
with corresponding to the most massive and rapidly star-forming galaxies in the
simulation. We also find that its radius, 105$pm$28 pc, is a factor of
$approx$2 smaller than the mean size in a separate simulation project DRAGONS.
Interestingly enough, the observed size is similar to the small sizes seen in
very low-luminosity $zapprox$6-10 galaxies behind lensing clusters. | Source: | arXiv, 1903.8177 | Services: | Forum | Review | PDF | Favorites |
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