CHAPTER 1: Introduction The Advanced Camera for Surveys (ACS), a third-generation instrument, was installed in the Hubble Space Telescope during Servicing Mission 3B (http://www.stsci.edu/hst/HST_overview/servicing_missions) on March 7, 2002. Its primary purpose is to increase HST imaging discovery efficiency by about a factor of 10, with a combination of detector area and quantum efficiency that surpasses previous instruments. ACS has three independent cameras that provide wide-field, high resolution, and ultraviolet imaging capabilities respectively, using a broad assortment of filters designed to address a large range of scientific goals. In addition, coronagraphic, polarimetric, and grism capabilities make this a versatile and powerful instrument. The ACS Instrument Handbook, which is maintained by the ACS-WFPC2 Team at STScI, describes the instrument properties, performance, operations, and calibration. It is the basic technical reference manual for the instrument, and should be used with other documents (listed in Table 1.1) for writing Phase I proposals, detailed Phase II programs, and for data analysis. (See Figure 1.1). The documents in Table 1.1 can be downloaded from the ACS STScI Web site, http://www.stsci.edu/hst/acs. Paper copies can be requested by sending a message to help@stsci.edu or by calling 410-338-1082. European users may also contact the Space Telescope European Coordinating Facility (ST ECF) at Garching, Germany (+49-89-320 06-291, stdesk@eso.org). 1 2 Chapter 1: Introduction Table 1.1: Useful documents Purpose Document or resource General observatory information HST Primer http://www.stsci.edu/hst/proposing/docs/proposing/documents/cp/primer.pdf Phase I proposals Proposing Overview http://www.stsci.edu/hst/proposing/docs/proposingOverview Call for Proposals http://www.stsci.edu/hst/hst/proposing/documents/cp/cp_cover.html Phase II programs Phase II Proposal Instructions http://www.stsci.edu/hst/programs/hst/proposing/docs/p2pi.html Astronomer's Proposal Tool (APT) for Phase II preparations http://apt.stsci.edu/ Data analysis ACS Data Handbook http://www.stsci.edu/hst/acs/documents/handbooks/DataHandbookv4/ACS_longdhbcover.html Dither Handbook http://www.stsci.edu/instruments/wfpc2/Wfpc2_driz/dither_handbook.html Space Telescope Analysis Newsletter http://www.stsci.edu/hst/acs/documents/isrs/hst/acs/documents/newsletters Instrument Science Reports http://www.stsci.edu/hst/acs/documents/isrs Calibration and Pipeline Information http://www.stsci.edu/hst/Post-observation Instrument specific ACS Web page http://www.stsci.edu/hst/acs ACS Forum http://forums.stsci.edu/phpbb/viewforum.php?f=14 3 Figure 1.1: Handbook roadmap for proposal preparation. Review special Cycle 17 issues for ACS. Chapter 2 Obtain overview of ACS capabilities and operation. Information on ACS detectors. Chapter 3 Select imaging & estimate exposure times. Chapter 4 Select coronagraphy, polarimetry, or grisms & estimate exposure times. Chapter 5, Chapter 9 Chapter 6 Detailed exposure time calculations? Chapter 9 Additional reference material. Chapter 10 Select data-taking mode. Chapter 7 Information on ACS calibrations. ACS Web site Determine overheads and calculate Phase I orbit time request. Chapter 8,Chapter 9 4 Chapter 1: Introduction