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http://hdl.handle.net/20.500.12386/29673
Title: | The Grism Lens-amplified Survey from Space (GLASS). X. Sub-kiloparsec Resolution Gas-phase Metallicity Maps at Cosmic Noon behind the Hubble Frontier Fields Cluster MACS1149.6+2223 | Authors: | Wang, Xin Jones, Tucker A. Treu, Tommaso Morishita, Takahiro Abramson, Louis E. Brammer, Gabriel B. Huang, Kuang-Han Malkan, Matthew A. Schmidt, Kasper B. FONTANA, Adriano GRILLO, CLAUDIO Henry, Alaina L. Karman, Wouter Kelly, Patrick L. Mason, Charlotte A. MERCURIO, AMATA Rosati, Piero Sharon, Keren Trenti, Michele Vulcani, Benedetta |
Issue Date: | 2017 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 837 | Issue: | 1 | First Page: | 89 | Abstract: | We combine deep Hubble Space Telescope grism spectroscopy with a new Bayesian method to derive maps of gas-phase metallicity for 10 star-forming galaxies at high redshift (1.2≲ z≲ 2.3). Exploiting lensing magnification by the foreground cluster MACS1149.6+2223, we reach sub-kiloparsec spatial resolution and push the limit of stellar mass associated with such high-z spatially resolved measurements below {10}<SUP>8</SUP> {M}<SUB>☉ </SUB> for the first time. Our maps exhibit diverse morphologies, indicative of various effects such as efficient radial mixing from tidal torques, rapid accretion of low-metallicity gas, and other physical processes that can affect the gas and metallicity distributions in individual galaxies. Based upon an exhaustive sample of all existing sub-kiloparesec resolution metallicity gradient measurements at high z, we find that predictions given by analytical chemical evolution models assuming a relatively extended star-formation profile in the early disk-formation phase can explain the majority of observed metallicity gradients, without involving galactic feedback or radial outflows. We observe a tentative correlation between stellar mass and metallicity gradients, consistent with the “downsizing” galaxy formation picture that more massive galaxies are more evolved into a later phase of disk growth, where they experience more coherent mass assembly at all radii and thus show shallower metallicity gradients. In addition to the spatially resolved analysis, we compile a sample of homogeneously cross-calibrated integrated metallicity measurements spanning three orders of magnitude in stellar mass at z ∼ 1.8. We use this sample to study the mass-metallicity relation (MZR) and find that the slope of the observed MZR can rule out the momentum-driven wind model at a 3σ confidence level. | URI: | http://hdl.handle.net/20.500.12386/29673 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/aa603c | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/aa603c | Bibcode ADS: | 2017ApJ...837...89W | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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Wang_GLASS2017.pdf | Pdf editoriale | 7.4 MB | Adobe PDF | View/Open |
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