ACS coronagraphic flat fields

Details ACS coronagraphic flat fields ACS coronagraphic flat fields

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004acs..rept....2k&link_type=abstract

Instrument Science Report ACS 2004-016, 10 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Coronagraphic Flat Fields

Scientific paper

Due to vignetting by the Lyot stop and the presence of occulting spots, ACS coronagraphic flat fields are different than those used for calibrating normal ACS/HRC images. An additional complication is caused by the random, time-dependent motions of the occulting spots. Flat fielding of an ACS coronagraphic image requires division by a pixel-to-pixel flat followed by division of a separate flat that contains the vignetting patterns of the occulting spots, appropriately shifted to match their locations for a particular observation date. Coronagraphic flats can only be obtained on-orbit for a few filters, so some must be derived from prelaunch calibration data. Given the limited number of datasets available from which to construct flats and the fact that ACS coronagraphic programs are dominated by imaging of extended sources (circumstellar disks), the correction of throughput variations to <2% on spatial scales of a few pixels or more is the goal.

Affiliated with

Also associated with

No associations

Rating

ACS coronagraphic flat fields does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with ACS coronagraphic flat fields, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ACS coronagraphic flat fields will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1856774