The MOSDEF survey: an improved Voronoi binning technique on spatially resolved stellar populations at z ∼ 2
Author
Fetherolf, TaraReddy, Naveen A
Shapley, Alice E
Kriek, Mariska
Siana, Brian

Coil, Alison L
Mobasher, Bahram
Freeman, William R
Sanders, Ryan L
Price, Sedona H
Shivaei, Irene
Azadi, Mojegan
de Groot, Laura
Leung, Gene C K
Zick, Tom O
Affiliation
Univ Arizona, Steward ObservIssue Date
2020-09-11Keywords
methods: data analysisgalaxies: evolution
galaxies: fundamental parameters
galaxies: high-redshift
Metadata
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OXFORD UNIV PRESSCitation
Fetherolf, T., Reddy, N. A., Shapley, A. E., Kriek, M., Siana, B., Coil, A. L., ... & Zick, T. O. (2020). The MOSDEF survey: an improved Voronoi binning technique on spatially resolved stellar populations at z∼ 2. Monthly Notices of the Royal Astronomical Society, 498(4), 5009-5029.Rights
© 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
We use a sample of 350 star-forming galaxies at 1.25 < z < 2.66 from the Multi-Object Spectrograph For Infra-Red Exploration (MOSFIRE) Deep Evolution Field survey to demonstrate an improved Voronoi binning technique that we use to study the properties of resolved stellar populations in z similar to 2 galaxies. Stellar population and dust maps are constructed from the high-resolution CANDELS/3D-HST multiband imaging. Rather than constructing the layout of resolved elements (i.e. Voronoi bins) from the signal-to-noise (S/N) distribution of the H-160-band alone, we introduce a modified Voronoi binning method that additionally incorporates the S/N distribution of several resolved filters. The spectral energy distribution (SED)-derived resolved E(B - V)(stars), stellar population ages, star-formation rates (SFRs), and stellar masses that are inferred from the Voronoi bins constructed from multiple filters are generally consistent with the properties inferred from the integrated photometry within the uncertainties, with the exception of the inferred E(B - V)(stars) from our z similar to 1.5 sample due to their UV slopes being unconstrained by the resolved photometry. The results from our multifilter Voronoi binning technique are compared to those derived from a `traditional' single-filter Voronoi binning approach. We find that single-filter binning produces inferred E(B - V)(stars) that are systematically redder by 0.02 mag, on average, but could differ by up to 0.20 mag and could be attributed to poorly constrained resolved photometry covering the UV slope. Overall, we advocate that our methodology produces more reliable SED-derived parameters due to the best-fitting resolved SEDs being better constrained at all resolved wavelengths - particularly those covering the UV slope.ISSN
0035-8711EISSN
1365-2966Version
Final published versionSponsors
National Aeronautics and Space Administrationae974a485f413a2113503eed53cd6c53
10.1093/mnras/staa2775