AAS 201st Meeting, January, 2003
Session 52. Galaxy Evolution and Surveys: Observations and Interpretation
Poster, Tuesday, January 7, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[52.04] Rest Frame Optical Spectra of Lyman Break Galaxies: Other Lensing Arcs around MS1512-cB58

H. I. Teplitz (SIRFT Science Center), M. A. Malkan, I. S. McLean (UCLA)

We present near-infrared spectra of "A2", the primary counter arc to MS1512-cB58. We detect redshifted H-alpha, [NII], [OIII], and H-beta at z=2.728± 0.001. Further, A2 has the same H-alpha/[OIII] ratio as cB58, suggesting that it is indeed another image of a single background galaxy. Published lensing reconstruction reports that A2 is a mangification of the entire source while cB58 is an image of only a part. A2 shows much weaker continuum emission than cB58 (by a factor of ~2), possibly detecting an uneven distribution of old and yound stars across the galaxy.

We observe a second emission line source in the slit. This object is blueshifted from cB58 by ~150 km/sec and has a significantly lower H-alpha/[OIII] ratio, indicating that it likely an image of a different background galaxy.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.