AAS 200th meeting, Albuquerque, NM, June 2002
Session 62. HST Instrumentation
Display, Wednesday, June 5, 2002, 10:00am-7:00pm, SW Exhibit Hall

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[62.06] Early Observations with the ACS Ramp Filters

Z. Tsvetanov (JHU), G. Hartig, R. Bohlin (STScI), H. D. Tran, A. Martel, M. Sirianni (JHU), M. Clampin (STScI)

The Advanced Camera for Surveys (ACS) on-board the Hubble Space Telescope (HST) is equipped with a set of ramp filters which provide imaging capability at 2% and 9% bandwidth in the range 3700-10700 Å. Each ramp filter consist of three segments where the middle segment can be used with both the Wide Field Channel (WFC) and High Resolution Channel (HRC), while the inner and outer segments can be used only with WFC. The monochromatic field of view is approximately 40'' by 80''.

We will present observations of the planetary nebula (PN) NGC6543 (the Cat's Eye) taken with the ACS ramp filetrs in several key emission lines - [O II] 3727, [O III] 5007, H-alpha+[N II], and [S II] 6725. These four emission lines fall onto three separate middle ramp segments - FR388N, FR505N, and FR656N - and will allow inter-comparison between the ACS ramp filters and fixed bandpass narrow-band filters F502N and F658N for both the WFC and HRC detectors. These observations were taken as part of the HST Servicing Mission Orbital Verification program and were designed to test ramp filters performance. We will demostrate our ability to obtain monochromatic (i.e., emission line) images at arbitrary wavelength and recover the surface brightness distribution.

This work was supported by a NASA contract and a NASA grant.

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

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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.