Astrophysics Seminars

Oct
29
2009

Institute for Advanced Study Informal Astrophysics Seminar

Ly-alpha Emission from Galaxy Formation
Claude-André Faucher-Giguère
11:30am|Bloomberg Hall Astrophysics Library
Astronomers have exquisite observations of both galaxies (by directly imaging their stars) and of the intergalactic medium (in absorption spectra of background sources). While we know that the galactic baryons must have been accreted from the IGM...
Oct
22
2009

Institute for Advanced Study Informal Astrophysics Seminar

Balancing Outflows and Gas Dilution: The Mass-Metallicity Relation at z=0
Molly Peeples
11:30am|Bloomberg Hall Astrophysics Library
The gas-phase oxygen abundances of star-forming galaxies are tightly correlated with the galaxies' stellar masses such that more massive galaxies are more oxygen-rich. Because oxygen is produced on relatively short timescales (~10 Myr), this so...
Oct
01
2009

Institute for Advanced Study Informal Astrophysics Seminar

Modeling the Flyby Anomalies with Dark Matter Scattering
Stephen Adler
11:30am|Bloomberg Hall Astrophysics Library
We continue our exploration of whether the flyby anomalies can be explained by scattering of spacecraft nucleons from dark matter gravitationally bound to the earth. We formulate and analyze a simple model in which inelastic and elastic scatterers...