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Physics Colloquium Announcement
Swenson College of Science and Engineering
Department of Physics
University of Minnesota Duluth

"Intermediate-Mass 
Star-Forming Regions: 
Connecting the Low-and 
High-Mass Regimes"

Michael Lundquist
University of Wyoming

Wednesday, February 25
LSCI 175
4:00pm


Abstract: Current research into Galactic star formation has focused on either massive star-forming regions or nearby low-mass regions. We present results from a multi-wavelength survey of Galactic intermediate-mass star-forming regions (IM SFRs). These regions were selected from mid-infrared colors that specify cool dust and large PAH contribution, suggesting that they produce stars up to but not exceeding 8 solar masses. Using mid-infrared WISE data we have classified 984 candidate IM SFRs as star-like objects, galaxies, filamentary structures, or blobs/shells.  Focusing on blobs/shells, the sites of active star-forming regions, we study the stellar and molecular content.  We compare these results to those of high-mass star formation in order to better understand their role in the star-formation paradigm.

Michael is attempting to recruit students into the PhD program at the University of Wyoming while he is here.  He has enough money to take 6 to 8 of our Physics (undergrad and M.S.) students to dinner.  If you are interested, please let Marc Seigar know (msseigar@d.umn.edu).

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Physics Colloquium Announcement
Swenson College of Science and Engineering
Department of Physics
University of Minnesota Duluth

"From Einstein-De Sitter
Debate to the 
Expanding Universe"

Michel Janssen
Professor in the Program in the History of Science,
Technology, and Medicine and the School of Physics and Astronomy
University of Minnesota Twin Cities

Thursday, March 5
Alworth Planetarium
1:00pm



Abstract: Relativistic cosmology was born in a debate in 1916-18 between Einstein and the Dutch astronomer Willem de Sitter about the question whether Einstein's general theory of relativity lives up to its name and eradicates all remnants of absolute space and absolute motion. Einstein was eventually forced to admit that it does not. The cosmological models and the cosmological constant introduced in the course of their debate, however, remained central to the discussion of cosmology throughout the 1920s. It was only after observations by Hubble and others convinced cosmologists in the early 1930s that the universe is expanding that these models gave way to the model at the basis of big-bang cosmology, which had already been found in the 1920s by Friedman, Lemaitre, and Robertson. There was no need for the cosmological constant in this model and in 1932 Einstein and De Sitter officially suggested the constant be dropped. In the late 1990s, however, it made a spectacular comeback with the discovery that the expansion of the universe is accelerating.

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