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Phd and Honours - Honours projects
Honours or Masters projects are smaller in scale than PhD projects, and aim to provide senior undergraduate students with a research project they can undertake at a level of ~50% of their time over the course of their enrolment. Honours or Masters students will be expected to write a thesis for their University describing this work, and are often also able to write up results for publication in a refereed scientific journal.
Some potential Honours/Masters projects are listed below. The nature of research is that some of these projects could be extended and grow into PhD projects. Similarly members of staff may have other projects waiting in the wings. Astronomy is a subject in which developments move rapidly - so the hot topics by the time such a project starts could have changed. All projects are worked out by discussion between you and your prospective supervisor, so treat this list as a source of ideas and a starting point. If you're interested in subject areas not covered below, you are encouraged to contact relevant AAO astronomers directly. Students who are interested in projects in astronomical instrumentation should contact the AAO's Head of Instrumentation, Andrew Sheinis, or the Head of Instrument Science, Jon Lawrence. Lee Spitler and Richard McDermid (AAO/Macquarie Lecturers) can also be contacted for information on Masters Projects through Macquarie University. PhD students who undertake brief (3 month) research projects in their first year, prior to starting their main thesis project can be co-supervised by AAO astronomers in such projects, and some of the projects below may be suitable for this.
Project: Revealing dust properties in distant environments
Supervisor: Tayyaba Zafar
The cosmic dust plays a crucial role in the formation of stellar populations. The extinction curve is a standard tool to study dust absorption and scattering at optical/ultra-violet wavelengths. Extinction curves reveal information about dust grain sizes, their compositions and properties. Typically at higher redshifts, the extinction curves from the Local Group (i.e., Milky Way, Large and Small Magellanic Clouds) are used as a reference to derive extinction in those environments. Quasars and Gamma-ray bursts are the brightest sources in the universe and can be seen up to the epoch of reionisation. There are plenty of data available (both spectroscopic and photometric) from various telescopes for these high-redshift objects from the ultra-violet to the near-infrared to generate their spectral energy distributions and hence derive individual extinction curves rather than using reference Local Group extinction laws. The analysis so far done using smaller samples of quasars indicates featureless and steeper extinction curves at higher redshifts (Zafar et al. 2015). This suggests different dust grain populations and/or effects of radiation fields in the vicinity. This project with a larger sample will help in understanding the transition of extinction curves at higher redshifts and inferring various dust populations.
Project: Unveiling the large scale kinematics of nearby galaxies in the Dragons survey
Supervisor: Caroline Foster
The projected shape of galaxies on the sky has been used to categorise and interpret the formation of galaxies since the dawn of extragalactic astronomy. Despite several decades of efforts, the classification of galaxies is still being debated, particularly with the advent of new technology able to observe the velocity dimension efficiently. This essentially allows for galaxies to be observed in 3D. For technical reasons, this kinematic classification is usually limited to the very inner parts of galaxies and could change further out. It is thus important to study the 3D outskirts of galaxies to obtain a reliable classification.
As part of the "Here be dragons" survey, we have obtained VLT/VIMOS spectra of 5 nearby galaxies out to large galactocentric radii. These data are mostly reduced and in hand. Given the success of this pilot project, we are applying for a larger survey (30 targets) on Gemini. With the current data, we hope to test the scale at which the kinematic classification holds and probe the kinematic transition beyond the usually probed effective radius. Indeed, these kinematically distinct halos (KDH, see Foster et al. 2013) have been observed in several early-type galaxies. A KDH is predicted for merger remnants, and given the fact that most galaxies are the product of multiple mergers, such a feature should be present in the majority of early-type galaxies. With this sample of varied morphological types (spirals to ellipticals), we hope to determine how widely spread KDHs are across the Hubble sequence.
This project offers the possibility of early involvement in the new Dragons survey, the use of data from world-class observatories and of a recently developed data reduction technique (Norris et al. 2008; Proctor et al. 2009) to push the galactocentric boundary. The selected student will acquire invaluable spectral and kinematical analysis skills that are easily portable to popular IFU studies. The Dragons survey is an international collaboration between scientists in Australia, Canada, Chile, USA and The Netherlands, offering a connection to further worldwide opportunities.
Project: 2D spectroscopic analysis of local dwarf star-forming galaxies
Supervisor: Angel Lopez-Sanchez and Heath Jones (Macquarie)
The new observational technique of 2D spectroscopy using Integrated Field Units (IFU) is providing amazing new results about the kinematics and the chemical composition of galaxies. In particular, Blue Compact Dwarf Galaxies (BCDGs) are excellent targets to perform such studies, because their modest sizes allow that all the galaxy can be observed in just some few pointings. During the last year we have collected some 2D spectroscopy data of a sample of BCDGs using the new WiFeS instrument available at the 2.3m ANU telescope at Siding Spring Observatory, and the preliminary results are quite promising. We are offering the opportunity of study one or two of the BCDGs for which we already have good-quality data. In particular, this project will give to the Honours student an introduction to 2D spectroscopy techniques (we expect to continue the observations using both WiFeS @ 2.3m ANU and SPIRAL @ 3.9m AAT) and to gain some expertise in the reduction and analysis of this kind of data. The aims of this project is to perform an analysis of the physical (mass, star-formation rate, extinction, electron temperature and density, excitation), chemical (ionic and total abundances of helium, oxygen, nitrogen, sulphur, neon, argon...) and kinematical properties of the ionized gas within these galaxies, which may be compared with the properties of the neutral gas from our own ATCA observations. Finally, the student will also learn to write up the results not only for his/her Honours Thesis but for a subsequent publication. As an example of this project, please consult the 2D spectroscopical analysis of the brightest star-forming region of the local BCDG IC10, López-Sánchez et al. (2011) and this research image.