Astronomy & Physics

Astronomy & Physics

 Canadian Astronaut To Visit SMU

While visiting the Department of Astronomy and Physics at Saint Mary's Univeristy, Canadian Astronaut, Jeremy Hansen, will give a public talk (all are welcome) on Oct 5th at 7pm, in the Scotia Bank Theatre, Sobey School of Buisness, 923 Robie Street. 

Jeremy Hansen

Jeremy Hansen (upside down, or is he?) and David Saint-Jacques falling toward the earth while inside a NASA C-9 aircraft that is also falling toward the earth. PHOTO CREDIT: Canadian Space Agency.


The masses of galaxies as determined from model fits to resolved images (used here as plotting points) compared to fits using unresolved (i.e., single pixel) images depends on the rate of star formation in the galaxy.

Ph.D. graduate student Bobby Sorba and Professor Sawicki improve mass estimates of galaxies.

Sorba and Dr. Sawicki's recent research paper (to be published in the Monthly Notices of the Royal Astronomical Society) shows that model fits to resolved images of galaxies produce similar mass estimates to model fits to unresloved images for galaxies but only for galaxies that have lower rates of internal star fromation. As the star formation rates increase, the masses derived from unresolved model fits are lower (presumably underestimated) compared to the model fits to the resolved images. Indeed, as they show in the figure above the trend is linear. Astronomers can can continue to estimate the masses of galaxies using unresolved images (necessary for faint galaxies such as high red shift galaxies) and then apply a simple correction to improve the mass estimate. 

A Postdoctoral Research Fellow position in experimental nuclear physics, at TRIUMF, Canada with Professor Rituparna Kanungo is available. For more information: IRIS_Postdoc_2015

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September 1, 2015
Improving mass estimates of galaxies
Ph.D. graduate student Sorba and his research supervisor Dr. Sawicki's publish research on galaxy masses in MNRAS.

Liz Arcilia-Osejo_TN
July 30, 2015
Dead Galaxies
PhD candidate Liz Arcilia-Osejo is interviewed on CTV's Live at 5 about her research on dead galaxies.

ASTRO-H X-ray telescope
June 15, 2015
Prof. Gallo leads Astro-H
Prof. Gallo leads Canadian contribution to X-ray telescope.

Father Lonc
November 27, 2014
In Memoriam of Dr William Lonc
Fr. Dr. William P. Lonc, S.J. died on November 27, 2014; he was 84 years old.

Logan Francis
December 1, 2014
Best Undergraduate Science Paper
Logan Francis wins award for science project on physical random number generators.

Jeremy Hansen
October 5, 2015, AT 305
Meet and Greet with Astronaut Hansen
Canadian Astronaut Jeremy Hansen

October 2, 2015, AT101
Adaptive Mesh Chemodynamical Simulations and Synthetic Observations
Mr. Ben Thompson (University of Central Lancashire, SMU)

October 9, 2015, AT101
Dr. Kim Venn (University of Victoria)

October 16, 2015, AT101
The mysterious origins of the heaviest elements
Dr. Rebecca Surman (University of Notre Dame)

October 17, 2015, TBA
MacLennan Lecture
Dr. Alex Fillippenko (University of California, Berkeley)