The rest-frame optical (900nm) galaxy luminosity function at z∼4–7: abundance matching points to limited evolution in the MSTAR/MHALO ratio at z ≥ 4
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Stefanon, Mauro
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The rest-frame optical (900nm) galaxy luminosity function at z∼4–7: abundance matching points to limited evolution in the MSTAR/MHALO ratio at z ≥ 4
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Abstract
We present the first determination of the galaxy luminosity function (LF) at z ∼4, 5, 6, and 7, in the rest-frame
optical at l ~ rest 900 nm (z′ band). The rest-frame optical light traces the content in low-mass evolved stars
(∼stellar mass—M*), minimizing potential measurement biases for M*. Moreover, it is less affected by nebular
line emission contamination and dust attenuation, is independent of stellar population models, and can be probed
up to z ∼8 through Spitzer/IRAC. Our analysis leverages the unique full-depth Spitzer/IRAC 3.6–8.0 μm data
over the CANDELS/GOODS-N, CANDELS/GOODS-S, and COSMOS/UltraVISTA fields. We find that, at
absolute magnitudes where Mz¢ is fainter than ≳-23 mag, Mz¢ linearly correlates with MUV,1600. At brighter Mz¢,
MUV,1600 presents a turnover, suggesting that the stellar mass-to-light ratioM* LUV,1600 could be characterized by a
very broad range of values at high stellar masses. Median-stacking analyses recover an M* Lz¢ roughly
independent on Mz¢ for Mz¢ ≳ -23 mag, but exponentially increasing at brighter magnitudes. We find that
the evolution of the LF marginally prefers a pure luminosity evolution over a pure density evolution, with the
characteristic luminosity decreasing by a factor of ~5x between z∼4 and z ∼7. Direct application of the
recovered M* Lz¢ generates stellar mass functions consistent with average measurements from the literature.
Measurements of the stellar-to-halo mass ratio at fixed cumulative number density show that it is roughly constant
with redshift forMh ≳ 1012 M⊙
12 . This is also supported by the fact that the evolution of the LF at 4 ≲ z ≲ 7 can be
accounted for by a rigid displacement in luminosity, corresponding to the evolution of the halo mass from
abundance matching.
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NASA, NAS5-26555
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Artículo de publicación ISI Artículo de publicación SCOPUS
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The Astronomical Journal, 843:36 (26pp), 2017 July 1
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