Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7138s&link_type=abstract
HST Proposal ID #7138
Other
Hst Proposal Id #7138
Scientific paper
The proposal is to do imaging and spectroscopy of the relatively bright arcs in the cluster RXJ 1347.5-1145, which is thought to be the most luminous cluster in the X-ray {Schindler et al. 1995, A&A, 299, L12}. The cluster itself is at a redshift of 0.451 and there are two bright arcs symmetrically situated at about 35 arcsec from the brightest cluster member. Many more candidate arcs have been seen from ground based observations, but would need high-resolution imaging to confirm them. Our spectroscopic observations of the northern arc show only one emission feature at about 6730 A which dominates the spectrum, and a very faint continuum on either side of it. The emission line is most likely the [OII] 3726 + 3729 A doublet, in which case the redshift of this arc is 0.81. The southern arc shows no emission features in the optical wavelengths. UV spectra are necessary to unambiguously determine the redshift of the arcs. The proposal is to do the following: {i} Imaging the field in the long-pass and clear filters {with CCD}, which will reveal the structure of the bright arcs, and confirm the nature of many other candidate arcs present in the field. {one orbit} {ii} Spectroscopy of the northern arc using G230L and G750L with the 52x2arcsec slit. This will unambiguously confirm the redshift of the arc. Thus we will get the distance to both the lensing galaxy as well as the arcs. This information will be combined with the imaging data {structure and separation of the arcs} to derive the mass of this most massive gravitational lens. Combined with the optical data, the mass-to-light ratio, and hence the dark matter content will be derived. The ground based observations suggest that the G750L spectrum will have clear signal at 6730 {with S/N > 20}. If this line is indeed the [OII] line, then the [OIII] lines should be clearly seen at 8926 and 9012 A, which are impossible to observe from the ground because of the strong atmospheric lines. Thus the observations will unambiguously confirm the redshift of the arc. The G230L should show the Lyman alpha line as well as the UV-continuum of the arc.
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