THE EVOLUTION of the GALAXY STELLAR MASS FUNCTION at z = 4-8: A STEEPENING LOW-MASS-END SLOPE with INCREASING REDSHIFT
Astrophysical Journal, ISSN: 1538-4357, Vol: 825, Issue: 1
2016
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Article Description
We present galaxy stellar mass functions (GSMFs) at z = 4-8 from a rest-frame ultraviolet (UV) selected sample of ∼4500 galaxies, found via photometric redshifts over an area of ∼280 arcmin in the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS)/Great Observatories Origins Deep Survey (GOODS) fields and the Hubble Ultra Deep Field. The deepest Spitzer/IRAC data to date and the relatively large volume allow us to place a better constraint at both the low- and high-mass ends of the GSMFs compared to previous space-based studies from pre-CANDELS observations. Supplemented by a stacking analysis, we find a linear correlation between the rest-frame UV absolute magnitude at 1500 Å () and logarithmic stellar mass () that holds for galaxies with . We use simulations to validate our method of measuring the slope of the -M relation, finding that the bias is minimized with a hybrid technique combining photometry of individual bright galaxies with stacked photometry for faint galaxies. The resultant measured slopes do not significantly evolve over z = 4-8, while the normalization of the trend exhibits a weak evolution toward lower masses at higher redshift. We combine the -M distribution with observed rest-frame UV luminosity functions at each redshift to derive the GSMFs, finding that the low-mass-end slope becomes steeper with increasing redshift from at z = 4 to at z = 8. The inferred stellar mass density, when integrated over -10 M , increases by a factor of between z = 7 and z = 4 and is in good agreement with the time integral of the cosmic star formation rate density.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84978194621&origin=inward; http://dx.doi.org/10.3847/0004-637x/825/1/5; http://stacks.iop.org/0004-637X/825/i=1/a=5?key=crossref.0c156c12058654c63f757ced11c2ae49; http://stacks.iop.org/0004-637X/825/i=1/a=5/pdf; https://iopscience.iop.org/article/10.3847/0004-637X/825/1/5; https://dx.doi.org/10.3847/0004-637x/825/1/5; https://validate.perfdrive.com/9730847aceed30627ebd520e46ee70b2/?ssa=d3ae2618-6613-470c-b691-d933ba3d16b4&ssb=43281290935&ssc=https%3A%2F%2Fiopscience.iop.org%2Farticle%2F10.3847%2F0004-637X%2F825%2F1%2F5&ssi=ae4e5237-cnvj-4744-aed9-354b61f4b7a6&ssk=botmanager_support@radware.com&ssm=097736449792953827784655776401865119&ssn=b33c334349d8de8c0fa97e65358a78d6e9740900c3c4-8990-4f21-a07ee4&sso=17d50f8c-bc564dd29deadb7e010b9a2e1f66b02c11d60ccf31433973&ssp=43533907601726561295172704978932743&ssq=57056668872789126285329239704737282765726&ssr=NTIuMy4yMTcuMjU0&sst=com.plumanalytics&ssu=&ssv=&ssw=&ssx=eyJfX3V6bWYiOiI3ZjYwMDBkNzYzNGE3Ni05ZTRkLTRjMmMtYjJhMC1mYzAzNGMyZjE1MjkxNzI2NTI5MjM5NDUzNTU5NDg4MjkwLTI0ZjNjZWU2ZDg0MDgzMDE3NzgyOTciLCJyZCI6ImlvcC5vcmciLCJ1em14IjoiN2Y5MDAwMGMxZDc2YmItMzk2MS00N2VjLTlkZGItNjdmYTVhZTY2ODdlOC0xNzI2NTI5MjM5NDUzNTU5NDg4MjkwLTYyNTQyNTQ5ZTg0ZjJhMWE3NzgyMTMifQ==
American Astronomical Society
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