The Physical Conditions of a Lensed Star-forming Galaxy at z=1.7

Abstract

We report rest-frame optical Keck/NIRSPEC spectroscopy of the bright lensed galaxy RCSGA 032727-132609 at z=1.7037. From precise measurements of the nebular lines, we infer a number of physical properties: redshift, extinction, star formation rate, ionization parameter, electron density, electron temperature, oxygen abundance, and N/O, Ne/O, and Ar/O abundance ratios. The limit on [O III]~4363 A tightly constrains the oxygen abundance via the "direct" or electron temperature method, for the first time in an average-metallicity galaxy at z~2. We compare this result to several standard "bright-line" O abundance diagnostics, thereby testing these empirically-calibrated diagnostics in situ. Finally, we explore the positions of lensed and unlensed galaxies in standard diagnostic diagrams, and explore the diversity of ionization conditions and mass--metallicity ratios at z=2.

ApJ in press. 15 pages, 7 figures

References in corpus (13)

• The Mass-Metallicity Relation at z~2
• Optical Spectroscopy and Nebular Oxygen Abundances of the Spitzer/SINGS Galaxies
• A New Sample of Low-mass Black Holes in Active Galaxies
• New insights into the stellar content and physical conditions of star-forming galaxies at z = 2-3 from spectral modelling
• Rest-Frame Optical Spectra of Three Strongly Lensed Galaxies at z~2
• The Red-sequence Cluster Survey-2 (RCS-2): survey details and photometric catalog construction
• The Cosmic Horseshoe: Discovery of an Einstein Ring around a Giant Luminous Red Galaxy
• A very bright, highly magnified Lyman-break galaxy at z=3.07
• Mid-Infrared Spectroscopy of Lensed Galaxies at 1<z<3: The Nature of Sources Near the MIPS Confusion Limit
• The Origin of Line Emission in Massive z~2.3 Galaxies: Evidence for Cosmic Downsizing of AGN Host Galaxies
• Spitzer Observations of the z=2.73 Lensed Lyman Break Galaxy, MS1512-cB58
• First direct metallicity measurement of a lensed star-forming galaxy at z=1.7
• Turning Back the Clock: Inferring the History of the Eight O'clock Arc

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