Text Only Queen's U. Directory Contact: Queen's  |  Physics
 queensu.ca   physics.queensu.ca    


Home

............................................

  General Information

............................................
 
Contact Us

.....................................
 
Maps and Directions

.....................................
 
Colloquia and Talks

.....................................
 
Department News

.....................................
 
Employment

.....................................
 
Facilities

.....................................
 
IT Support

.....................................
 
About Queen's

.....................................
 
About Kingston

.....................................

Undergrad Studies

............................................

Graduate Studies

............................................

Research Groups

............................................

Faculty & Staff

............................................

Alumni & Friends

............................................

Visitors & Residents

............................................

Queen's Observatory

............................................

 
 Upcoming Talks        Past Talks        Calendar View

Departmental Colloquium


SCUBA-Diving in Nearby Molecular Clouds: New Constraints

Dr. Doug Johnstone


NRC/Herzberg Institute
University of Victoria (Adjunct)

Time
 
Thu. January 9, 2003     2:30 PM     STIRLING C

Abstract
 

I will present results from sub-millimetre surveys of the nearby molecular clouds. Combining large area JCMT continuum emission images at 450 and 850 microns, sensitive to ~ 0.1 Solar mass condensations, with molecular line data (CO isotopes, CS, formaldehyde, etc.) allows for a glimpse into the physical properties of molecular clouds on small scales. Both barely resolved condensations and large scale features are visible in the maps, revealing the variety of dynamical events which operate in star forming regions. I will discuss the important physics associated with these regions, as evidenced by the survey results: the formation of filamentary structures with threaded magnetic fields, sculpting of the medium by outflows, shocks in jets, and the temperature and dust emission properties of both large and compact structures. I will also present a model of the many compact clumps found in the dust continuum images in order to derive their physical properties - mass, temperature, and bounding pressure. The derived cumulative mass function for these clumps will be shown to be remarkably similar to the stellar IMF. I will close the talk with a discussion of how these observational clues may be used to solve the outstanding problem of how stars are formed.

Dr. Doug Johnstone is a candidate for the
Observational-Experimental Astronomer
position in the Department.

Refreshments will be available in the lounge after the talk.

List of upcoming talks and colloquia

Calendar for the current month



  Back to top
©2013 Department of Physics, Engineering Physics & Astronomy
Queen's University
Kingston, Ontario
K7L 3N6 Canada
Web Inquiries
webmaster@physics.queensu.ca
Departmental Inquiries
dept@physics.queensu.ca