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The rest-frame optical (900nm) galaxy luminosity function at z ~ 4-7: abundance matching points to limited evolution in the M_(STAR)/M_(HALO) ratio at z ⩾ 4

Stefanon, Mauro and Bouwens, Rychard J. and Labbé, Ivo and Muzzin, Adam and Marchesini, Danilo and Oesch, Pascal and Gonzalez, Valentino (2017) The rest-frame optical (900nm) galaxy luminosity function at z ~ 4-7: abundance matching points to limited evolution in the M_(STAR)/M_(HALO) ratio at z ⩾ 4. Astrophysical Journal, 843 (1). Art. No. 36. ISSN 1538-4357. http://resolver.caltech.edu/CaltechAUTHORS:20170628-142531971

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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 λ_(res) ~ 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 M_z’ is fainter than ≳-23 mag, M_z’ linearly correlates with M_(UV, 1600). At brighter M_z’, M_(UV, 1600) presents a turnover, suggesting that the stellar mass-to-light ratio M*/L_(UV, 1600) could be characterized by a very broad range of values at high stellar masses. Median-stacking analyses recover an M*/L_z’ roughly independent on M_z’ for M_z’ ≳ -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*/L_z’ 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 for M_h ≳ 10^(12) M⊙. 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/1538-4357/aa72d8DOIArticle
http://iopscience.iop.org/article/10.3847/1538-4357/aa72d8/metaPublisherArticle
http://arxiv.org/abs/1611.09354arXivDiscussion Paper
ORCID:
AuthorORCID
Stefanon, Mauro0000-0001-7768-5309
Bouwens, Rychard J.0000-0002-4989-2471
Labbé, Ivo0000-0002-2057-5376
Muzzin, Adam0000-0002-9330-9108
Marchesini, Danilo0000-0001-9002-3502
Oesch, Pascal0000-0001-5851-6649
Gonzalez, Valentino0000-0002-3120-0510
Additional Information:© 2017 The American Astronomical Society. Received 2016 November 24; revised 2017 March 26; accepted 2017 May 10; published 2017 June 28. We are appreciative to Adriano Fontana for a very helpful referee report that greatly improved this paper. M.S. would like to thank Adriano Fontana for constructive discussions. M.S. and R.B. are grateful to Karina Caputi, Yuichi Harikane, Michele Trenti, and Stuart Wyithe for helpful feedback on an advanced draft of this manuscript. This work is based on data products from observations made with ESO Telescopes at the La Silla Paranal Observatory, under ESO programme ID 179.A-2005, and on data products produced by TERAPIX and the Cambridge Astronomy Survey Unit on behalf of the UltraVISTA consortium. This work is based on observations taken by the CANDELS Multi-Cycle Treasury Program with the NASA/ESA HST, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. This work is based on observations taken by the 3D-HST Treasury Program (GO 12177 and 12328) with the NASA/ESA HST, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.
Group:SPLASH, COSMOS
Subject Keywords:galaxies: evolution – galaxies: formation – galaxies: high-redshift – galaxies: luminosity function, mass function
Record Number:CaltechAUTHORS:20170628-142531971
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170628-142531971
Official Citation:Mauro Stefanon et al 2017 ApJ 843 36
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78668
Collection:CaltechAUTHORS
Deposited By: Joy Painter
Deposited On:28 Jun 2017 21:31
Last Modified:03 Jan 2018 18:31

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