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.
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.
Professor Deupree Retires
The Department of Astronomy and Physics, and the Institute for Computational Astrophysics (ICA) wishes Bob Deupree a fond farewell.
A large complete ULIRG sample at z~2
Dr Jiasheng Huang
Quantum Physics in Your Light Bulb: A Colourful Story
Dr. Kris Poduska, Memorial University
Studying the Epoch of Inflation with the Cosmic Microwave Background — Lithographic Fabrication of Cold, Superconducting Electronics
Dr. Scott Chapman, Dalhousie University
Femtosecond Pulse Shaping for Tailored Control of Semiconductor Quantum Bits
Dr. Kimberley Hall, Dalhousie University
A video-plankton and microstructure profiler for the exploration of in-situ connections between zooplankton and turbulence
Dr. Tetjana Ross, Dalhousie University