Dark Matter in Early-Type Galaxies

Joint Discussion IAU-GA, August 3-5, 2009


Our understanding of dark matter in early-type galaxies has improved significantly since the last IAU GA meeting on the topic back in 2003 (IAU 235). In the last four years there have been breakthroughs in observational and modeling techniques (e.g. lensing, dynamics and X-rays), as well as in theoretical studies, and large observational surveys.

Are the observational results now presenting a self-consistent picture? Are there major problems with the standard cold matter scenario? Are there any viable alternatives to dark matter?

With the next generation of facilities coming on line worldwide or in design stage (e.g. Atacama Large Millimeter Array, Extremely Large Telescopes, James Webb Space Telescope, Large Synoptic Survey Telescope, Square Kilometer Array, etc.), that allow us to probe galaxies at redshifts z=1 or beyond with similar precision as in the local Universe, the time is right in 2009 to assess the current status of the field and discuss future scientific goals.

Topics during the Joint Discussion:

(1) Stellar and Dark-matter Density Profiles

(2) CDM and Stellar Substructure

(3) Scaling Relations

(4) Formation Mechanisms

(5) Cosmic Evolution

(6) Observational/Modeling Techniques

(7) New/Ongoing Surveys

SOC: Luca Ciotti (Italy), Wyn Evans (UK), Ortwin Gerhard (Germany), Leon Koopmans (Chair, Netherlands), Dan Maoz (Israel), Priya Natarajan (USA), Takaya Ohashi (Japan), Silvia Pellegrini (Italy), Tommaso Treu (co-Chair, US)


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Last updated May 1st. 2009

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