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Session 8 - Distance Indicators.
Display session, Monday, January 15
North Banquet Hall, Convention Center

[8.02] The Distance to CL0016+16 and the Hubble Constant

We use ROSAT and ASCA X-ray data and Sunyaev-Zel'dovich effect data from the Owens Valley Radio Observatory to estimate the distance to the rich, distant (z=0.5455) cluster of galaxies CL0016+16. We study the sensitivity of the derived value of the Hubble constant to various assumptions about the form of the cluster's three-dimensional density distribution. Specifically we consider spherically symmetric isothermal-\beta models, (2) purely elliptical isothermal-\beta models, and (3) a deprojection of elliptical isophotes fitted to the ROSAT PSPC data. Results are given for prolate vs. oblate geometries as well as arbitrary line-of-sight inclination angles.

Program listing for Monday