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

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

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.5204t&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #52.04; Bulletin of the American Astronomical Society, Vol. 34, p.1192

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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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