ACS Photometric Zero Point Verification

Details ACS Photometric Zero Point Verification ACS Photometric Zero Point Verification

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9889d&link_type=abstract

HST Proposal ID #9889

Computer Science

Hst Proposal Id #9889 Stellar Populations

Scientific paper

The uncertainties in the photometric zero points create a fundamental limit to the accuracy of photometry. The current state of the ACS calibration is surprisingly poor, with zero point uncertainties of 0.03 magnitudes in the Johnson filters. The reason for this is that ACS observations of excellent ground-based standard fields, such as the omega Cen field used for WFPC2 calibrations, have not been obtained. Instead, the ACS photometric calibrations are based primarily on semi-emprical synthetic zero points and observations of fields too crowded for accurate ground-based photometry. I propose to remedy this problem by obtaining ACS broadband images of the omega Cen standard field with both the WFC and HRC. This will permit the direct determination of the ACS transformations, and is expected to double the accuracy to which the ACS zero points are known. A second benefit is that it will facilitate the comparison of the WFPC2 and ACS photometric systems, which will be important as WFPC2 is phased out and ACS becomes HST's primary imager.

Affiliated with

Also associated with

No associations

Rating

ACS Photometric Zero Point Verification 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 Photometric Zero Point Verification, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ACS Photometric Zero Point Verification will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1133668