[17.01] The Photometric Performance and Calibration of ACS.

AAS 202nd Meeting, May 2003
Session 17 Deep Imaging Surveys
Oral, Monday, May 26, 2003, 2:00-3:30pm, 205/206

[17.01] The Photometric Performance and Calibration of ACS.

M. Sirianni (JHU), G. De Marchi (STScI/ESA), R. Gilliland (STScI), M.K. Jee (JHU), J. Mack (STScI), H.C. Ford (JHU), G.D. Illingworth (UCO/Lick Obs.), M. Clampin (GSFC), G. Hartig (STScI), N. Cross (JHU), ACS Science Team, STScI ACS Team

We present the results of the photometric calibration of the HST/ACS. We discuss the on-orbit sensitivity, encircled energy and accuracy of the photometry with ACS. We provide synthetic zero points for all the flight filters. HRC/WFC observations of the globular clusters 47 Tuc and NGC 2419 have been used to calculate the transformations for main filters between the two cameras. Synthetic photometry is used to determine the transformations for all the other flight filters. In addition we present the results of the transformations between ACS and WFPC2 photometric systems.

ACS was developed under NASA contract NAS 5-32865, and this research is supported by NASA grant NAG5-7697. We are grateful for an equipment grant from the Sun Microsystems, Inc.

The author(s) of this abstract have provided an email address for comments about the abstract: sirianni@pha.jhu.edu

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