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http://hdl.handle.net/20.500.12386/26551
Titolo: | The Grism Lens-Amplified Survey from Space (GLASS). II. Gas-Phase Metallicity and Radial Gradients in an Interacting System At Z ≃ 2 | Autori: | Jones, T. Wang, X. Schmidt, K. B. Treu, T. Brammer, G. B. Bradač, M. Dressler, A. Henry, A. L. Malkan, M. A. PENTERICCI, Laura Trenti, M. |
Data pubblicazione: | 2015 | Rivista: | THE ASTRONOMICAL JOURNAL | Numero: | 149 | Fascicolo: | 3 | Da pagina:: | 107 | Abstract: | We present spatially resolved gas-phase metallicity for a system of three galaxies at z = 1.85 detected in the Grism Lens-Amplified Survey from Space (GLASS). The combination of Hubble Space Telescope (HST’s) diffraction limit and strong gravitational lensing by the cluster MACS J0717+3745 results in a spatial resolution of ≃200-300 pc, enabling good spatial sampling despite the intrinsically small galaxy sizes. The galaxies in this system are separated by ≃50-200 kpc in projection and are likely in an early stage of interaction, evidenced by relatively high specific star formation rates. Their gas-phase metallicities are consistent with larger samples at similar redshift, star formation rate (SFR), and stellar mass. We obtain a precise measurement of the metallicity gradient for one galaxy and find a shallow slope compared to isolated galaxies at high redshift, consistent with a flattening of the gradient due to gravitational interaction. An alternative explanation for the shallow metallicity gradient and elevated SFR is rapid recycling of metal-enriched gas, but we find no evidence for enhanced gas-phase metallicities which should result from this effect. Notably, the measured stellar masses log {{M}<SUB>*</SUB>}/{{M}<SUB></SUB>} = 7.2-9.1 probe to an order of magnitude below previous mass-metallicity studies at this redshift. The lowest mass galaxy has properties similar to those expected for Fornax at this redshift, indicating that GLASS is able to directly study the progenitors of local group dwarf galaxies on spatially resolved scales. Larger samples from the full GLASS survey will be ideal for studying the effects of feedback, and the time evolution of metallicity gradients. These initial results demonstrate the utility of HST spectroscopy combined with gravitational lensing for characterizing resolved physical properties of galaxies at high redshift. | Acknowledgments: | We thank R. Maiolino for providing the metallicity calibrations used in this work, and B. Gibson for providing metallicity gradient evolution tracks from simulations. We thank the anonymous referee for a constructive report which improved the clarity of this paper. T. Johnson and K. Sharon are acknowledged for providing the map of the phase angle. T.A.J. acknowledges support from the Southern California Center for Galaxy Evolution through a CGE Fellowship. We acknowledge support from NASA through grant HST -13459. T.T. acknowledges support by the Packard Foundation in the form of a Packard Research Fellowship and thanks the American Academy in Rome and the Observatory of Monteporzio Catone for their generous hospitality. This paper is based on observations made with the NASA/ESA Hubble Space Telescope , and utilizes gravitational lensing models produced by PIs Bradač, Ebeling, Merten Zitrin, Sharon, and Williams funded as part of the HST Frontier Fields program conducted by STScI. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. The lens models were obtained from the Mikulski Archive for Space Telescopes (MAST). | URI: | http://hdl.handle.net/20.500.12386/26551 | URL: | https://iopscience.iop.org/article/10.1088/0004-6256/149/3/107 | ISSN: | 0004-6256 | DOI: | 10.1088/0004-6256/149/3/107 | Bibcode ADS: | 2015AJ....149..107J | Fulltext: | open |
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