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26 April 2024 |
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Stellar Properties of z ~ 8 Galaxies in the Reionization Lensing Cluster Survey | | Victoria Strait
; Marusa Bradac
; Dan Coe
; Larry Bradley
; Brett Salmon
; Brian C. Lemaux
; Kuang-Han Huang
; Adi Zitrin
; Keren Sharon
; Ana Acebron
; Felipe Andrade-Santos
; Roberto J. Avila
; Brenda L. Frye
; Austin Hoag
; Guillaume Mahler
; Mario Nonino
; Sara Ogaz
; Masamune Oguri
; Masami Ouchi
; Rachel Paterno-Mahler
; Debora Pelliccia
; | | Date: |
22 May 2019 | | Abstract: | Measurements of stellar properties of galaxies when the universe was less
than one billion years old yield some of the only observational constraints of
the onset of star formation. We present here the inclusion of
extit{Spitzer}/IRAC imaging in the spectral energy distribution fitting of
the seven highest-redshift galaxy candidates selected from the emph{Hubble
Space Telescope} imaging of the Reionization Lensing Cluster Survey (RELICS).
We find that for 6/8 extit{HST}-selected $zgtrsim8$ sources, the $zgtrsim8$
solutions are still strongly preferred over $zsim$1-2 solutions after the
inclusion of extit{Spitzer} fluxes, and two prefer a $zsim 7$ solution,
which we defer to a later analysis. We find a wide range of intrinsic stellar
masses ($5 imes10^6 M_{odot}$ -- $4 imes10^9$ $M_{odot}$), star formation
rates (0.2-14 $M_{odot}
m yr^{-1}$), and ages (30-600 Myr) among our sample.
Of particular interest is Abell1763-1434, which shows evidence of an evolved
stellar population at $zsim8$, implying its first generation of star formation
occurred just $< 100$ Myr after the Big Bang. SPT0615-JD, a spatially resolved
$zsim10$ candidate, remains at its high redshift, supported by deep
extit{Spitzer}/IRAC data, and also shows some evidence for an evolved stellar
population. Even with the lensed, bright apparent magnitudes of these $z
gtrsim 8$ candidates (H = 26.1-27.8 AB mag), only the extit{James Webb Space
Telescope} will be able further confirm the presence of evolved stellar
populations early in the universe. | | Source: | arXiv, 1905.9295 | | Services: | Forum | Review | PDF | Favorites | |
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