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arXiv · astro-ph/0312511

ACS Observations of a Strongly Lensed Arc in a Field Elliptical

J. P. Blakeslee·K. C. Zekser·N. Benitez·M. Franx·R. L. White·H. C. Ford·R. J. Bouwens·L. Infante·N. J. Cross·G. Hertling·B. P. Holden·G. D. Illingworth·V. Motta·F. Menanteau·G. R. Meurer·M. Postman·P. Rosati·W. Zheng
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Abstract

We report the discovery of a strongly lensed arc system around a field elliptical galaxy in Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) images of a parallel field observed during NICMOS observations of the HST Ultra-Deep Field. The ACS parallel data comprise deep imaging in the F435W, F606W, F775W, and F850LP bandpasses. The main arc is at a radius of 1.6 arcsec from the galaxy center and subtends about 120 deg. Spectroscopic follow-up at Magellan Observatory yields a redshift z=0.6174 for the lensing galaxy, and we photometrically estimate z_phot = 2.4\pm0.3 for the arc. We also identify a likely counter-arc at a radius of 0.6 arcsec, which shows structure similar to that seen in the main arc. We model this system and find a good fit to an elliptical isothermal potential of velocity dispersion $σ\approx 300$ \kms, the value expected from the fundamental plane, and some external shear. Several other galaxies in the field have colors similar to the lensing galaxy and likely make up a small group.

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J. P. Blakeslee, K. C. Zekser, N. Benitez, M. Franx, R. L. White, H. C. Ford, R. J. Bouwens, L. Infante, N. J. Cross, G. Hertling, B. P. Holden, G. D. Illingworth, V. Motta, F. Menanteau, G. R. Meurer, M. Postman, P. Rosati, W. Zheng. 2003-12-19. ACS Observations of a Strongly Lensed Arc in a Field Elliptical. https://doi.org/10.1086/382505

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