Image Stability  ACS SMOV image stability test (prop 9017) went from a cold soak (anti-solar pointing) for 8 orbits to a hot attitude (including off-nominal roll) –Nominal jitter (typically about 3 mas RMS and 10 mas peak-to-peak) –Smooth drift at rates up to about 6 mas/hr in both the HRC and WFC (same direction). –Drift may be due to FGS's or to rigid body movement of the ACS wrt the OTA –Similar to image drift rates for other SIs.

Calibration – Flat Fields  L-flat for the F555W filter, the plot is a 4th order least-squares fit to the stellar photometry. –~10% gradient from upper left to lower right –(Mack, van der Marel, Bohlin, Blakeslee, Cox)

Flat field – Sanity Checks  Ratio of the F555W photometry in the CRJ to the DRZ image, corrected for distortion. –White is 1.10 and black is Pixel Map from Geometric distortion – ratio produces 1% residual

SensitivitySensitivity Inflight sensitivity vs prediction from components HRCWFC

WFC Distortion Calibration 4 th order 2D polynomial fit matches observed distortion well - RMS residual 1.1 mas (.02 px) - peak deviation ~.2 px

WFC CCD Amplifier Cross-talk Low-level “ghosts” of extended objects mirrored in alternate quadrants Slight “droop” (fractional e-) in bias level of all 3 alternate amps Ghosts do not appear to be proportional to target signal Hard (2 e - ) stretch of WFC UGC10214 image

WFC: Long wave halo Al metal layer reflects long- photons F814wF850LP

WFC: Long wave halo F775WF850LPFR1016N IR Encircled Energy Performance

Optical “Ghosts” Two ghost features have been identified with >0.1% of target energy: WFC CCD to window reflection produces pairs of elliptical ghosts with ~ 0.2% integrated energy F660N [NII] filter produces halos with ~2% of integrated energy due to reflection between its surfaces

Cats-Eye Nebula NGC 6543 (HRC) [OII] 3727 [OIII] 5007 H  Ramp filter

Coronagraph performance Target acquisition functions executed proposal second time with dithering to determine optimum location under each occulting spot

Coronagraph Dither Results

Coronagraph Performance

SBC – First Light Image Globular star cluster NGC6681. This cluster, with [Fe/H] = -1.5, is rich in Blue Horizontal Branch stars.The image combines first light data taken with three filters F125LP, F150LP, and F165LP.

Solar Blind Channel

CALACSCALACS First generation updates to CALACS & PyDrizzle are complete, software is frozen for distribution in next STSDAS Includes ST-ECF AXE software for grism/prism Mosaic generated from 18 images of 47 Tuc

HDF-N: i+ z & grism WFC - 2x i - 3x z orbits - “HDF overlay” Grism: 3 orbits

HDF-N ACS Grism examples Emission-line galaxy with continuum and knots - [OIII] 5007 and H  6563 Redshift z = F814 AB = 22.5 (WFC 2x i + 3x z orbits, 3 grism orbits)

HDF-N SN2002dc WFC 2x i + 3x z orbits, 3 grism orbits Galaxy & SN z=0.475 Identified from difference imaging with WFPC2 HDFN

HDF-N SN2002dc Galaxy and SN at z=0.48 SN mag. is 22.7 (i) Type I (probably Ia) Galaxy & SN z=0.475

SN2002ddSN2002dd Galaxy z=0.79 Identified from extracted spectra ! SnIa z=1.06

HDF-N SN2002dd Follow-up with DD proposal

Cool Image – A1689 Courtesy ACS Science Team

Image Stability