Mathematics – Logic
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9450j&link_type=abstract
HST Proposal ID #9450
Mathematics
Logic
Hst Proposal Id #9450
Scientific paper
Much effort has been devoted to estimating Hubble's constant H_0 using observations of very nearby objects. Gravitational lensing time delays offer potentially the most accurate method for determining H_0 using observations on cosmological scales; it is a very clean method in that little complicated astrophysics is involved, and it is a single-step method compared to the traditional multi-step distance ladder. The major problem with most such determinations in the past has been systematic errors due to uncertainties in the lens mass model, leading to 20 Einstein-ring lens system, is the one system for which these systematic uncertainties can be reduced very substantially, and in particular is unique in that the modelling systematics can be reduced to the level of the uncertainties in the measurement of the time delay. The only requirement left is to be able accurately to locate the centre of the lensing galaxy. We propose an extremely deep ACS image in I-band of this system for this purpose; the prize is a robust 5 {lens mass model}. We have conducted simulations to estimate the necessary S:N ratio in an ACS observation in order to be able to achieve a successful deconvolution of the lens galaxy and lensed images with the required accuracy.
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