| タイトル | The Charge Transfer Efficiency and Calibration of WFPC2 |
| 本文（外部サイト） | http://hdl.handle.net/2060/20000063503 |
| 著者（英） | Dolphin, Andrew E. |
| 著者所属（英） | National Optical Astronomy Observatories |
| 発行日 | 2000-06-01 |
| 言語 | eng |
| 内容記述 | A new determination of WFPC2 photometric corrections is presented, using HSTphot reduction of the WFPC2 Omega Centauri and NGC 2419 observations from January 1994 through March 2000 and a comparison with ground-based photometry. No evidence is seen for any position-independent photometric offsets (the "long-short anomaly"); all systematic errors appear to be corrected with the CTE and zero point solution. The CTE loss time dependence is determined to be very significant in the Y direction, causing time-independent CTE solutions to be valid only for a small range of times. On average, the present solution produces corrections similar to Whitmore, Heyer, & Casertano, although with an improved functional form that produces less scatter in the residuals and determined with roughly a year of additional data. In addition to the CTE loss characterization, zero point corrections are also determined as functions of chip, gain, filter, and temperature. Of interest, there are chip-to-chip differences of order 0.01 - 0.02 magnitudes relative to the Holtzman et al. calibrations, and the present study provides empirical zero point determinations for the non-standard filters such as the frequently-used F450W, F606W, and F702W. |
| NASA分類 | Astronomy |
| レポートNO | NOAO-Preprint-882 |
| 権利 | No Copyright |
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