Keck Adaptive Optics Imaging of 0.5
| Autor: | Steinbring, Eric, Metevier, A. J., Norton, Stuart A., Raschke, L. M., Koo, D. C., Faber, S. M., Willmer, C. N. A, Larkin, J. E., Glassman, T. M. |
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| Rok vydání: | 2004 |
| Předmět: | |
| DOI: | 10.48550/arxiv.astro-ph/0407242 |
| Popis: | We have employed natural guide star adaptive optics (AO) on the Keck II telescope to obtain near-infrared (H and K') images of three field galaxies, each of redshift greater than 0.5. These are among the highest-redshift non-active disk galaxies to be imaged with AO. Each of the galaxies was chosen because it had been observed previously with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 (WFPC2) by others. Our AO images in the near infrared (NIR) closely match both the depth and high spatial resolution of those optical data. Combining the archival V and I data with our new H and K' images potentially produces a long wavelength baseline at uniform resolution. The NIR data probe emission well longward of the 4000-Angstrom break at these redshifts, and provide stellar fluxes less contaminated by dust. We fit two-dimensional galaxy bulge-plus-disk models simultaneously in all bands, and compare stellar-population-synthesis modeling to the photometry of these separated components. This is an initial foray into combining HST and AO imaging to produce a high spatial-resolution multi-color dataset for a large sample of faint galaxies. Our pilot program shows that NIR AO images from large ground-based observatories, augmented by HST images in the optical, can in principle provide a powerful tool for the analysis of faint field galaxies. However, the AO data S/N will have to be increased, and AO PSFs need to be controlled more carefully than they were here. 22 pages, 16 Postscript figures. Accepted for publication in the ApJ Supplements |
| Databáze: | OpenAIRE |
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