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Colloquia Series

For more information on colloquia at the Centre for Astrophysics and Supercomputing please contact Dr. Simon Stevenson and Dr. Stefan Osłowski ()

Swinburne Virtual Reality Theatre
AR Building, Room 104
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2020 Colloquia

Thursday May 7, 10:30
Katie Auchettl (University of Melbourne)
Colloquium: TBA
Thursday Apr 30, 10:30
Meg Millhouse (University of Melbourne)
Colloquium: TBA
Tuesday Apr 28, 10:30
Arianna Dolfi ()
Student Review: Mid-term review
Mid-term review
Thursday Apr 23, 10:30
Nicha Leethochawalit (University of Melbourne)
Colloquium: TBA
Tuesday Apr 21, 10:30
Ryan Turner ()
Student Review: Ryan Turner CoC talk
Thursday Apr 16, 10:00
Danielle Berg (Ohio State University)
Colloquium: TBA
Thursday Apr 9, 10:30
Kim Ellis (Swinburne University of Technology)
Colloquium: TBA
Tuesday Apr 7, 10:30
Christian Lehmann (CAS)
Student Review: Christian Lehmann's Confirmation of Candidature review
Time: Apr 7, 2020 10:30 AM Canberra, Melbourne, Sydney

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Thursday Mar 26, 10:30
Tim Roth (imachination projects)
Colloquium: Music of the Spheres and the colourful Birth of Astrophysics
How does the Ancient Music of the Spheres sounds under the conditions of Astrophysics of the 21th century? The Heaven’s Carousel presented from 20 March – 6 April in occasion of the World Science Festival and Curiocity Brisbane gives a contemporary answer. The kinetic artwork was developed by Tim Otto Roth in collaboration with Hubble Space Telescope. The 36 illuminated speakers rotating over the heads of the audience create a giant sound accelerator playing with the Doppler Effect and echoing the accelerated expansion of the universe as Adam Riess pointed out at the premiere 2014 in Rome.

Tim Otto Roth will speak not only as artist about his numerous astrophysical collaborations, but in his double role as art and science historian he will talk also about the strong tie between colour observation of the celestial spheres and the birth of astrophysics in the 19th century.
The highly sophisticated concept of colour in astrophysics inspired by colorimetric observations and the spectroscopic decomposition of starlight is complementary to the colour experiments of (Neo-)Impressionism emerging at about the same time. As immediate physical effect spectra challenge our concepts of image and visualization, so spectra in astronomy are at least as unsettling as the colourful explorations by the French painters.

Tim Otto Roth (*1974) is a German conceptual artist, composer and scholar. He is known and awarded for his large art & science projects in public space including scientists of top research institutions around the world, as ESO, CERN (Geneva) or IceCube in Antarctica. He considers his work as a plea for a physics of art. As art and science historian he published in 2015 the definite book »Cultural History of Shadow Pictures« (Fink).
Thursday Mar 19, 10:30
Geoff Bryan ()
Student Review: Geoff Bryan's DTR
Online via Zoom:

Panel member; zoom link booked for 2 hours.

At this stage, Geoff plans to use the AR Tearoom to deliver his talk
Thursday Mar 19, 14:00
Mohsen Shamohammadi (Swinburne)
Student Review: Mohsen CoC review
Mohsen will give his CoC review on Millisecond pulsar timing with Parkes and MeerKAT.

Zoom link: Hi there,

Matthew Bailes is inviting you to a scheduled Zoom meeting.

Time: Mar 19, 2020 02:00 PM Canberra, Melbourne, Sydney
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Tuesday Mar 17, 10:00
Student Review: Chandra draft thesis review

Time: Mar 17, 2020 10:00 AM Canberra, Melbourne, Sydney
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Thursday Mar 12, 10:30
Camila Correa (UvA)
Colloquium: Morphological transformations in the local Universe: an observational and theoretical perspective
In this talk I will summarise recent results of the dependence of the galaxy stellar-to-halo mass relation on galaxy morphology. I use data from the Sloan Digital Sky Survey DR7 with morphological classifications from Galaxy Zoo, and also compare with the EAGLE cosmological simulation, to draw a coherent physical picture of the different evolutionary paths of discs and ellipticals. I will also explore possible scenarios of galaxies undergoing morphological transformation and quenching. To finalise I will discuss the limitations of current simulations such as EAGLE, and introduce the ongoing simulation project of EAGLE-2.
Wednesday Mar 11, 10:30
Brodie Norfolk ()
Student Review: Brodie Norfolk's CoC
Tuesday Mar 10, 10:30
Bron Reichardt Chu ()
Student Review: Bron Reichardt Chu's CoC
Tuesday Mar 3, 10:30
Sara Webb ()
Student Review: Sara Webb MCR
Sara's mid-candidature review
Thursday Feb 27, 10:30
Daniel Ceverino (Universidad Autonoma de Madrid )
Colloquium: Simulations at the Dwarf Scale: From Violent Dwarfs at Cosmic Dawn and Cosmic Noon to Quiet Discs today
Dwarf galaxies with stellar masses of 10^9 Msun can be explored at high and low redshifts and they give a glimpse of the different conditions of galaxy formation at different epochs. Using a large sample of about 300 zoom-in cosmological hydrodynamical simulations of galaxy formation I will briefly describe the formation of dwarfs at this mass scale at 3 different epochs: cosmic dawn, cosmic noon, and today. I will describe the FirstLight simulations of first galaxies at redshifts 5-15. These first dwarfs have extremely high star formation efficiencies due to high gas fractions and high gas accretion rates. At cosmic noon, z = 2, galaxy formation is a violent process. The VELA simulations have generated a set of dispersion-dominated dwarfs that show an elongated morphology due to their prolate dark-matter halos. Between z =1-0, the AGORA simulation shows the formation of a low-mass disc due to slow gas accretion.
Tuesday Feb 25, 10:30
Gurvarinder (CAS)
Student Review: Gurvarinder CoC
Thursday Feb 20, 10:30
Prof Sukyoung Yi (Yonsei University Korea)
Colloquium: The origin and fate of the discs of spiral galaxies from numerical simulations
I will present new results on the formation and fate of discs of spiral galaxies from the New Horizon and Galactica simulations. The high-resolution simulations (>40pc) reveal the history of disc settling, build-up, and fading in great detail and provide hints to the origin of the thin and thick discs.
Tuesday Feb 18, 10:30
Grace Lawrence (Swinburne)
Student Review: Grace Lawrence CoC
Grace Lawrence CoC review talk on detecting dark matter, all welcome
Thursday Feb 13, 10:30
Helga Denes (Astron)
Colloquium: The first seven months of the Apertif Imaging Survey
Apertif is the new phased-array feed receiver system on the Westerbork Synthesis Radio Telescope (WSRT). The substantially increased field of view of the telescope makes Apertif a great survey instrument. In July 2019, Apertif started survey observations for a two-tiered imaging survey, with a shallow and medium-deep component and a time domain survey searching for new (millisecond) pulsars and fast radio bursts (FRBs). The main science goals of the Imaging Survey are: the role of environment and interaction on galaxy properties, finding the smallest galaxies, connecting cold gas to AGN, understanding the faint radio population, and studying magnetic fields in galaxies. After a proprietary period, all survey data products will be publicly available through the Apertif Long Term Archive (ALTA, I will describe the first seven months of the Imaging Survey, where the team is observing and automatically processing the data to produce radio continuum images, polarisation images, and HI (neutral hydrogen) line cubes. I will show examples of the survey data and highlight the first science results from the survey.
Tuesday Feb 11, 10:30
Juan Espejo (CAS)
Student Review: Juan Espejo Confirmation of Candidature review - The evolution of galaxy Angular Momentum across cosmic time

The role of angular momentum in the evolution of star forming galaxies


The age of the Universe at which star formation peaks is interesting, angular momentum (j) has been measured to be low and gas fractions (f_gas) are high (compared to local analogues). Both j and f_gas play an important role in the evolution of disk galaxies to the grand design spirals we observe today and so it is important to measure them accurately. Measuring j at high redshift is particularly difficult, one needs deep observations in both infrared photometry (stellar mass distribution) and integral field spectroscopy (emission line kinematics) in order to get an accurate description of the angular momentum content. Currently, most high-z IFS data are natural seeing (NS) limited, which prevents accurate morphological classification, introduces artefacts and hides small scale kinematic structures that affect the real shape of the rotation curves. On the other hand, adaptive optics (AO) assisted observations improve resolution but suffer from SN loss. One way to account for this is to combine data at the different resolutions: i) AO high resolution data for the inner parts where signal is enough to prevail over the SN loss introduced by the AO correction (and where the rotation curve rises rapidly) and ii) NS low resolution data for the outer parts since SN is high (and where the rotation curve has already flattened). We have analysed a sample of 10 galaxies with the combination method at z∼1.5 and z∼2 (the largest sample at high-z with combined j measurements to our knowledge) from Keck/OSIRIS + VLT/KMOS+SINFONI + HST and we have explored the capabilities of applying the combination method such as a decrease in uncertainty and a more realistic determination of shape and morphology for each galaxy.
Thursday Feb 6, 10:30
Andy Bunker (University of Oxford)
Colloquium: Exploring the high redshift Universe with the James Webb Space Telescope
The James Webb Space Telescope (JWST) will provide a great opportunity to explore
high redshift galaxies, and understand the role of galaxies in the reionization
of the Universe. I will present our observational plans for the Guaranteed Time
Observations of the NIRSpec Instrument Science Team, including those co-ordinated with the NIRCam
Team as part of the JADES survey. Determining the UV luminosity function to faint
magnitudes, coupled with more accurate determinations of the escape fraction (from
observations of the Balmer lines and UV continuum), will address the ionizing photon budget
from galaxies. The census of the fraction of high redshift star-forming galaxies with Lyman alpha in
emission will constrain the neutral fraction of the IGM at z>6, and the size of the ionized bubbles,
and the study of rest-UV absorption lines and nebular emission will shed light on the outflows
and the role of the circum-galactic medium. Working at between 1 and 5 microns, NIRSpec on JWST
has the capability to explore the star formation rates, metallicities and IGM surroundings of
galaxies within the epoch of reionization.