Astronomy Colloquia

Towards measuring the Dark Matter cross-section (not just limiting it)

Speaker: 
Will Dawson, UC Davis
Event Date and Time: 
Mon, 2012-10-22 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate
DLSCL J0916.2+2951 (Musket Ball Cluster) is a galaxy cluster merger where the dark matter and galaxies have 
become dissociated from the collisional gas. Because the time since first pass-through is longer than for 
any other such merger, this system is the one most sensitive to a nonzero dark matter self-interaction 
cross-section, which would be observed as the dark matter trailing the collisionless galaxies.

POSTPONED - Gravitational lensing of the CMB: Science and synergies

Speaker: 
Sudeep Das, Berkeley Center for Cosmological Physics
Event Date and Time: 
Mon, 2012-10-15 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate

Sudeep is unable to make it to Vancouver for his colloquium.  We are working on an alternate date in the second term of the 2012/13 Astronomy Colloquium series.

CANFAR + Skytree: Mining massive datasets as an essential part of the future of astronomy

Speaker: 
Nick Ball, Herzberg Institute of Astrophysics
Event Date and Time: 
Mon, 2012-09-24 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate
The future study of large datasets, consisting of hundreds of millions to billions 
of objects, will be dominated by large computing resources, and by analysis tools 
of the necessary scalability and sophistication to extract useful information.
Astronomy data are no exception to this trend, and will require significant effort
to fulfil their potential as a provider of the next generation of science results.
To-date, computing systems have allowed either sophisticated analysis of small data 
sets, e.g., most astronomy software, or simple analysis of large datasets, e.g.,
database

Using artificial intelligence to find pulsars

Speaker: 
Aaron Berndsen, UBC Physics & Astronomy
Event Date and Time: 
Mon, 2012-09-17 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate
I'll start with a quick review of the many areas of physics which pulsars help us 
explore. Then I'll describe the typical current (and expected future) observing 
modes for pulsars (transitioning from single dishes to interferometers (EVLA, ASKAP, 
MeerKat, SKA, Lofar).  Finally, I'll report on a project to use artificial 
intelligence to help find pulsars, with an introduction to the principles of machine 
learning, and a presentation of some of our recent results.

A UBC saga - the first Doppler search for extra-solar planets

Speaker: 
Gordon Walker
Event Date and Time: 
Mon, 2012-09-10 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate
Hundreds of extra-solar planetary systems are known now, most confirmed or detected
by the Doppler reflex motion of the primary star. The development of digital
detectors and more powerful spectrographs in the 1970s improved the precision of
radial velocity measurements by orders of magnitude making it possible to detect
such tiny reflexes. In 1978 Bruce Campbell and I successfully introduced hydrogen
fluoride into the telescope beam of the DAO 1.2-m telescope to act as a wavelength
fiducial.

Hitting the JACPOT: Probing Accretion Disk - Radio Jet Coupling Over Entire Outbursts of X-ray Binaries

Speaker: 
Gregory Sivakoff (University of Alberta)
Event Date and Time: 
Mon, 2011-10-24 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate

Accretion disks and jets are ubiquitous astrophysical phenomena. Given the potential feedback between supermassive black holes and galaxy evolution, understanding the physics of accretion discs and relativistic radio jets around Active Galactic Nuclei (AGN) has gained increased motivation; however, the outbursts of AGN likely last millions of years.

Extrasolar parents

Speaker: 
Kaspar von Braun (NASA Exoplanet Science Institute and Caltech)
Event Date and Time: 
Mon, 2011-10-17 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate

We currently know of more than 500 extrasolar planets orbiting a variety of different host stars. These stars almost always represent the only visible component in the system, they are the dominant energy source for the orbiting planets, and they influence every aspect of planetary physics and evolution. Most astrophysical parameters of extrasolar planets are actually functions of equivalent stellar parameters, whose values are not always accurately known. The importance of "understanding the parent stars" cannot be overstated in the quest of exoplanet exploration.

Highlights from the southern High Time Resolution Universe pulsar survey

Speaker: 
Linda Levin (Swinburne University, Australia)
Event Date and Time: 
Fri, 2011-10-07 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews and Ingrid Stairs
Intended Audience: 
Graduate

Using the Parkes radio telescope, we have been searching for pulsars and fast transients within the High Time Resolution Universe survey since November 2008. With a higher time and frequency resolution than the earlier Parkes surveys, we are able to probe deeper into the Galactic plane for short duration signals. Still underway, the survey has so far revealed over a hundred previously unknown sources. I will give an update on the survey status and present some of the more interesting objects discovered, including a radio magnetar and the "diamond planet" pulsar.

GAMA: from little blue fuzzies to massive red monsters and beyond

Speaker: 
Sarah Brough (Anglo-Australian Observatory)
Event Date and Time: 
Mon, 2011-10-03 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews and David Woods
Intended Audience: 
Graduate

The Galaxy And Mass Assembly (GAMA) survey is currently a 144-square-degree multi-wavelength survey including optical spectra being collected at the Anglo-Australian Telescope (AAT). I will present some of my work to date with the GAMA survey, characterising the lowest star-forming systems in the sample - the little blue fuzzies. I will then outline how GAMA is ideally placed to answer questions remaining about the evolution of Brightest Cluster Galaxies (BCGs) - massive red monsters.

The Potential to Form Planets in the Orion Nebula

Speaker: 
Rita Mann (Herzberg Institute of Astrophysics)
Event Date and Time: 
Mon, 2011-09-26 16:00 - 17:15
Location: 
Hennings 318
Local Contact: 
Jaymie Matthews
Intended Audience: 
Graduate

The formation of planetary systems is intimately connected to the properties of the circumstellar disks in which they are born. Disk studies to date have focused on regions like Taurus and Ophiuchus for their proximity, however, stars rarely form in such isolated environments. Most stars form in massive star forming regions and there is even clear evidence that our Sun formed near an OB association like that found in Orion. Using the Submillimeter Array (SMA), we surveyed 67 protoplanetary disks ("proplyds") at 850 microns in the Orion Nebula to determine their masses.

Syndicate content
Website development by Checkmark Media. Designed by Armada.

a place of mind, The University of British Columbia

Faculty of Science
Department of Physics and Astronomy
6224 Agricultural Road
Vancouver, BC V6T 1Z1
Tel 604.822.3853
Fax 604.822.5324

Emergency Procedures | Accessibility | Contact UBC | © Copyright The University of British Columbia