AAO Colloquia

The AAO organises frequent colloquia at our North Ryde headquarters. These are usually held Thursday morning at 11:00 am, though other dates are occasionally scheduled. We welcome talks from visiting astronomers - if you are passing through Sydney and would like to tell us about your work, please fill out the AAO Visitor Form. The ATNF (Australia Telescope National Facility) also organises colloquia at their Epping offices. A schedule for these talks can be found on the ATNF Colloquia webpage. The AAO and ATNF occasionally organise Joint Colloquia when the speaker is likely to be of interest to both radio and optical communities. These talks will be found in both the list below, and the ATNF schedule. A list of past speakers can also be found below.

Next Scheduled AAO Colloquium

Sabine Bellstedt and David (Brint) Gardner, speaking on "Student Talks on Distant Galaxy Clusters (see below)", to be held in the AAO Meeting Room (Room 7, 1st Floor, Building 2) at 03:15PM on Tuesday 25th November, 2014.
Abstract:
Sabine Bellstedt:

Title: "Measuring the growth of Brightest Cluster Galaxies over the past 8 billion years"

Using a sample of 62 new clusters recently imaged in the near infra-red with the ESO NTT and WIYN telescopes, supplemented with 31 clusters gained through a search of the ESO archives, I measure how the mass of the most massive galaxies in the universe, the so-called Brightest Cluster Galaxies (BCG), increases with time. Using published X-ray luminosity values for the analysed clusters, the associated masses of 40 of these clusters was determined. Adding these data to the 132 BCGs published by Lidman et al (2012), the BCG-Cluster mass relation was calculated. I then used this sample to calculate the growth of BCGs in the redshift range 0.4-0.2 (corresponding to a look-back time of 4.3-2.4 billion years ago) to be 0.98 +- 0.21, supporting the notion that in recent times there has been a significant reduction in the rate that BCGs accrete stellar material.

Brint Gardner:

Title: "Searching for distant galaxy clusters in the XMM-XXL southern field using deep z-band images from DECam"

Abstract: Star formation in the dense environments of galaxy clusters appears to have shut down around 10 billion year ago. How this happened is not well understood because only a handful of galaxy clusters have been found at this time in the universe.
I will present two methods for detecting distant galaxy clusters using the galactic red sequence. I applied these two methods to wide field observations from both the newly installed Dark Energy Camera on the 4 metre Blanco telescope and the Spitzer-South Pole Telescope Deep Field survey. I will present my findings from a 25 square degree region in the XMM-XXL southern field out to a redshift of z = 2.

 

Upcoming Scheduled Colloquia

DateTimeLocationSpeakerTitle
Tuesday 25th November, 201403:15PMAAO Meeting Room (Room 7, 1st Floor, Building 2)Sabine Bellstedt and David (Brint) Gardner (University of Wollongong and Macquarie University)Student Talks on Distant Galaxy Clusters (see below)
Thursday 15th January, 201511:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)Chiaki Kobayashi (ANU / U Herfordshire)Cosmological simulations with AGN feedback
Friday 16th January, 201511:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)Andrew Bunker (ANU / University of Oxford)High Redshift Galaxies and the Epoch of Reionization

Past Colloquia

DateTimeLocationSpeakerTitle
Friday 21st November, 201402:00PMAAO Meeting Room (Room 7, 1st Floor, Building 2)Ricardo Carrera (IAC)The Open Cluster Chemical Abundances from Spanish Observatories survey (OCCASO)
Tuesday 18th November, 201411:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)Michael Childress (ANU)Progenitors of Type Ia Supernovae
Friday 14th November, 201411:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)Luca Cortese (Swinburne)Galaxy transformation and quenching in the local Universe
Thursday 13th November, 201411:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)Jillian Bellovary (Vanderbilt)Scrutinizing the Relationship Between Galaxies and Supermassive Black Holes
Thursday 6th November, 201411:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)D. John Hillier (University of Pittsburgh )Probing the Secrets of Ia Supernovae through their Spectra and Light Curves
Thursday 30th October, 201411:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)Brad Tucker (Australian National Observatory)Results from ESSENCE and the Kepler Extra-Galactic Survey (KEGS)
Tuesday 21st October, 201411:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)Peter Gillingham and Jeffrey Cooke (AAO and Swinburne)An Australian-led wide-field camera proposal for the Keck Observatory
Friday 17th October, 201411:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)David Sanders (IFA Hawaii)The Cosmic Evolution of Luminous and Ultraluminous Infrared Galaxies: New Results from the GOALS and Herschel-COSMOS Surveys
Thursday 9th October, 201411:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)Esteban Silva-Villa (AAO Visitor)Star clusters, field stars and spiral galaxies
Thursday 2nd October, 201411:00AMAAO Meeting Room (Room 7, 1st Floor, Building 2)Emily Wisnioski (MPE)The KMOS^3D Survey: design, first results, and the evolution of galaxy kinematics
Show all past colloquia