The Physical Conditions Of A Lensed Star-forming Galaxy At z=1.7

Details The Physical Conditions Of A Lensed Star-forming Galaxy At z=1.7 The Physical Conditions Of A Lensed Star-forming Galaxy At z=1.7

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21711404r&link_type=abstract

American Astronomical Society, AAS Meeting #217, #114.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We report rest-frame optical Keck/NIRSPEC spectroscopy of the brightest lensed galaxy yet dis- covered, 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 Te 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, to explore the diversity of ionization conditions and mass-metallicity ratios at z=2.

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