The ACS point spread function remains fairly stable over its field of view, compared to the PSFs in WFPC2 or STIS. However, ACS/WFC PSF core width and ellipticity variations are large enough to be of concern to those undertaking very small aperture photometry or measuring small, bright-nucleus galaxy ellipticities.
Instrument Science Report ACS 2003-06
- Pub Date:
- June 2003
- Hubble Space Telescope;
- Space Telescope Science Institute;
- Advanced Camera for Surveys;