Joint AAO/ATNF Colloquium.

Thursday, 22nd March - 3:30pm ATNF Lecture Theatre

Seeing Red: The 2 Micron All-Sky Survey and the Nearby Universe

John Huchra

Harvard - Smithsonian Center for Astrophysics

The 2 Micron All Sky Survey (2MASS) was initiated over a decade ago to produce an all sky photometric map in three colors in the near infrared. The primary goals of the survey are the study of large scale structure, both in the Milky Way itself and in the nearby universe. The survey scans are now complete and we have begun obtaining redshifts of the bright 2 micron selcted galaxies. The near IR is essentially the best place to select samples to survey the distribution of baryons in the universe. Combined with independent distance estimates to determine the peculiar velocity field of galaxies, which can also be obtained from the 2MASS survey, we shouldbe able to determine both the absolute amount of dark matter nearby and any difference in the distribution of dark matter and normal baryonic matter, if such exists. Preliminary results on the galaxy luminosity function, nearby structures and IR galaxy properties will be described, as well as our plans for completing the large scale redshift and distance surveys.