Astronomy & Physics
Astronomy & Physics
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.
Tier I Canada Research Chair - Astronomy. The Saint Mary's University Department of Astronomy and Physics invites applications from researchers in any area of astronomy and astrophysics to be the University’s nominee for our Tier I Canada Research Chair (CRC) in Astronomy. Contact Prof. Rob Thacker for more information. Click here for more details.
PhD candidate Liz Arcilia-Osejo is interviewed on CTV's Live at 5 about her research on dead galaxies.
Prof. Gallo leads Astro-H
Prof. Gallo leads Canadian contribution to X-ray telescope.
In Memoriam of Dr William Lonc
Fr. Dr. William P. Lonc, S.J. died on November 27, 2014; he was 84 years old.
Best Undergraduate Science Paper
Logan Francis wins award for science project on physical random number generators.
New 0.6m Medjuck Telescope unveiled at Burke-Gaffney Observatory.
How to Publish a Paper in Nature
Dr. Leslie Sage (University of Maryland; Nature)
Undergraduate Research Symposium
Summer undergraduate research symposium
The faintest galaxies as probes of cosmology and galactic evolution
Dr. Michelle Collins (Yale University)
Evidence for New relations between Gamma Ray Bursts prompt and X-ray Afterglow Emission from (almost) 11 Years of Swift
Dr. Dirk Grupe (Morehead State University)
Dr. Kim Venn (University of Victoria)