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

 Click Here for Colloquia


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.

New BGO Telescope with Mann
October 29, 2014
New Telescope
New 0.6m Medjuck Telescope unveiled at Burke-Gaffney Observatory.
October 30, 2014
Professor Deupree Retires
The Department of Astronomy and Physics, and the Institute for Computational Astrophysics (ICA) wishes Bob Deupree a fond farewell.
March 27, 2015, SB 160 (Sobey Building)
A large complete ULIRG sample at z~2
Dr Jiasheng Huang

March 26, 2015, Dalhousie Physics
Quantum Physics in Your Light Bulb: A Colourful Story
Dr. Kris Poduska, Memorial University

January 30, 2015, L 177
Femtosecond Pulse Shaping for Tailored Control of Semiconductor Quantum Bits
Dr. Kimberley Hall, Dalhousie University