https://martinmeyer.squarespace.com/work daily 0.75 2018-04-17 https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad03692c4997b6c021f9cac/1523594898976/ Projects https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad5bd9788251b7278ad0113/1523502621161/ Projects https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad5be5e70a6ad9f6120cfec/1523953647659/ Projects https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad40ab6575d1f10b3f993db/1523592449569/ Projects https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad03b980e2e72f68a3a0cbd/1523594665463/ Projects https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad0824d8a922de8df79521d/1523614285823/ Projects MeerKAT Observations of Nearby Galactic Objects - Observing Southern Emitters (MHONGOOSE) is a 1650h survey of 30 nearby galaxies with the MeerKAT telescope in South Africa. This will extended the limits in both resolution and column density sensitivity for these galaxies, giving new insight into the processes fuelling galaxies and star formation. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad02dae8290852670849c9e/1523592622437/ Projects https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad5b01cd6cd3da1c3757519/1523953692272/ Projects https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad5c06503ce6484a1e24781/1523460221606/ Projects https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad082ca575d1fe016cba7f8/1523614410371/ Projects - LADUMA https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad5bcc5f950b777a947b52f/1523949919209/ Projects https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad5be962b6a288e32b35f3d/1523595693060/ Projects https://martinmeyer.squarespace.com/papers2 daily 0.75 2018-04-26 https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5acf03e10e2e7224ab215fe5/1523955607843/hifi.png Papers Gallery - Tracing HI Beyond the Local Universe Summarises the formulae for determining HI properties at cosmological distances and presents the HiFi online calculator. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5acf0482575d1f0b6ed5ddfa/1523955669683/tfstacking.png Papers Gallery - Extended Tully-Fisher Relations from HI Stacking Exploration of HI stacking and the Tully-Fisher relation. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad0474d352f539b6024aa9a/1523955736315/simulated-galaxies-ASKAP-surveys-WALLABY-and-DINGO-300x169.jpg Papers Gallery - Predictions for ASKAP neutral hydrogen surveys Presents expected source detection rates for the DINGO and WALLABY HI surveys on ASKAP. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad04a3570a6adbfd889c145/1524726695454/hicat.png Papers Gallery - The HIPASS catalogue – I. Data presentation Presentation of the southern HIPASS extragalactic source catalogue. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad04b212b6a28b7eaa5610a/1523600293894/connectbaryons.png Papers Gallery - Connecting the Baryons: Multiwavelength Data for SKA HI Surveys SKA science book chapter examining the potential for acquiring multiwavelength data to compliment HI surveys. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad04c13562fa7b8c906c5ba/1523600474126/clustering.png Papers Gallery - The Weak Clustering of Gas-Rich Galaxies An examination of the 2pt correlation function and galaxy clustering in the HIPASS catalogue. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad04d2a8a922de8df74efd0/1523600792486/tfhicat.png Papers Gallery - Tully-Fisher Relations from an HI-Selected Sample Exploration of the Tully-Fisher relations derived from the HIPASS catalogue. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad04e9f8a922de8df750dad/1523601202139/ngc1313.png Papers Gallery - Stellar Clusters in NGC 1313: Evidence of Infant Mortality A study of dissolving star clusters using resolved star maps of NGC1313 from the Hubble Space Telescope. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad053f470a6adbfd88a9065/1523602766895/ic2574.png Papers Gallery - Hunting for Young Dispersing Star Clusters in IC 2574 The resolved star technique applied to search for dissolving clusters in IC2575. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad054c3aa4a99abb2e17ac2/1523602734934/delhaizestacking.png Papers Gallery - Detection of HI in distant galaxies using spectral stacking Measurement of the cosmic HI density to z<0.1 using data from Parkes. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad056416d2a73d7d24183d8/1523603078055/himfzwaan.png Papers Gallery - The HIPASS catalogue: ΩHI and environmental effects on the HI mass function of galaxies Derivation of the HI mass function from HIPASS https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad0578788251b63163584f0/1523603420857/MLEtf.png Papers Gallery - Precise Tully-Fisher Relations without Galaxy Inclinations Investigation into the use of Maximum Likelihood Methods to derive the Tully-Fisher relation without galaxy inclinations. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad05b5f0e2e72f68a3cdcd4/1523604447901/quasars.png Papers Gallery - Quasars from a Complete Spectroscopic Survey Identification of Quasars identified in the magnitude limited Fornax Spectroscopic Survey, and completeness examination of traditional Quasar candidate selection techniques. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad06c6c758d4672dc357585/1523608903098/m51calzetti.png Papers Gallery - Star Formation in NGC 5194 (M51a): The Panchromatic View from GALEX to Spitzer A multiwavelength comparision of star formation rate indicators in M51, including IR data from SINGS https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad06ebb88251b6316375fa4/1523609328082/poppingSKA.png Papers Gallery - Observations of the Intergalactic Medium and the Cosmic Web in the SKA era SKA science book chapter examining the potential of the facility to study the low column density HI Universe https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5acf03c7352f53c9cad249ac/5ad06f78575d1fe016c9f443/1523609571153/zwaanvelfunc.png Papers Gallery - The velocity function of gas-rich galaxies Analysis of the rotational velocity distribution function from HIPASS. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ae17ba7562fa74bb6d94df7/1523955607843/ Papers Gallery - Tracing HI Beyond the Local Universe Summarises the formulae for determining HI properties at cosmological distances and presents the HiFi online calculator. https://martinmeyer.squarespace.com/projects-gallery daily 0.75 2018-04-16 https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5ad0073288251b63162bd21b/5ad008ee758d4672dc2a52a5/1523844671312/cosmic+web.png Students Projects Gallery - The Cosmic Web - Feeding Galaxies over Cosmic Time Potential Supervisors: Attila Popping, Lister Staveley-Smith, Martin Meyer; Research Area: Gas and feedback in galaxies The distribution of matter in the Universe is not homogenous, but rather forms a complex web of walls, filaments, groups and clusters. Galaxies act as trace particles for this complex structure filling the Universe, with the underlying structure being dominated by Dark Matter and highly ionised gas. While extremely important for understanding how galaxies were able to grow and continue to form stars over the history of the Universe, this highly ionised material is extremely difficult to observe. This project will explore new ways of detecting the hidden cosmic web at radio wavelengths, through continuum observations for synchrotron emission, to deep spectral line observations for the small amount of neutral hydrogen still expected to be exist between and around galaxies. With a view towards future observations with FAST, the five hundred metre aperture telescope nearing completion in China, along with deep future surveys with the MeerKAT Square Kilometre Array pathfinder in South Africa, this project aims to advance our observational limits for one of the most elusive components of the baryonic Universe. Image: Simulation of the cosmic web (credit Popping) https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5ad0073288251b63162bd21b/5ad008edaa4a99abb2d83e7b/1523583594357/askap.png Students Projects Gallery - Revealing the Hidden Universe Potential Supervisors: Martin Meyer, Richard Dodson, Attila Popping; Research Area: Gas and feedback in galaxies; Data intensive astronomy Our understanding of the Universe is dominated by studies at optical wavelengths, and the emission from stars. While such studies have led to huge advances in our understanding of galaxy evolution, they can only reveal part of the picture. A crucial extra ingredient to study is the material that stars are made of - gas. The Square Kilometre Array and its pathfinders will lead to huge advances in this field, enabling studies of the emission from neutral atomic hydrogen at much larger distances than ever before. This project will aim to make use of data from two of the leading deep astronomical surveys currently underway (the CHILES survey being carried out on the Very Large Array in New Mexico, USA, and early science data from the DINGO survey on the Australian Square Kilometre Array Pathfinder) to create some of the most distant images of the atomic hydrogen content of galaxies ever made. These surveys are highly data intensive, with the data products for DINGO ultimately expected to exceed 1PB in size. This project will explore new methods to deliver the best possible survey images and refine the pipelines required to analyse data on such a massive scale. Research work will be carried out on the Galaxy and Magnus supercomputers at Pawsey, along with cutting edge resources available through the Amazon Web Services. Collaboration with colleagues in the United Kingdom is also expected, with this work directly relevant to the successful delivery of science with the Square Kilometre Array. Image: ASKAP (credit CSIRO) https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5ad0073288251b63162bd21b/5ad008f4aa4a99abb2d83f51/1523584091113/dingo.png Students Projects Gallery - The Evolution of Gas-Rich Galaxies Potential Supervisors: Martin Meyer, Attila Popping, Simon Driver, Lister Staveley-Smith; Research Area: Gas and feedback in galaxies; Data intensive astronomy, Multi-wavelength and spectroscopic surveys The era of the Square Kilometre Array presents many exciting challenges. For large surveys of the sky (be it wide-area studies of the nearby Universe or deep studies looking back in time) one of these challenges is locating the emission from galaxies in the huge amounts of data the next generation of telescopes will deliver. New algorithms are significantly advancing our abilities to automatically detect and parametrize the signals from astronomical sources, yet a number of important avenues remain unexplored. This project will investigate new ways in which we can deliver the most complete and accurate galaxy catalogues possible, be that through the use of optical redshift data to provide robust priors on the locations of galaxies, or the development of new methodologies, such as machine learning algorithms, to refine the reliability of automatically generated sources catalogues. This work is vital to the successful completion of spectral line surveys over the coming decades, in which billions of dollars of radio astronomy research infrastructure is now being developed and for which many millions of galaxies are going to need to be automatically identified and characterised. This project will make use of ASKAP early science data, and that from existing facilities, to make new measurements of the environmental dependence of the HI mass function, gas-fraction scaling relationships, and the cosmic density of HI. Image: Simulated galaxy distributions from the DINGO and WALLABY surveys on ASKAP, the image cubes from which are expected to contain ~600,000 galaxies. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5ad0073288251b63162bd21b/5ad008f80e2e72f68a331dd2/1523584241421/m81.png Students Projects Gallery - Fuel, Fireworks and Feedback Potential Supervisors: Martin Meyer, Lister Staveley-Smith; Research Area: Gas and feedback in galaxies; Multi-wavelength and spectroscopic surveys The evolution of galaxies is driven by many - often extreme - physical processes. Stars explode, supermassive black holes drive vast jets out of galactic centres, galaxies collide and gravitationally harass each other, and vast winds drive material out of galaxies as they fall into the densest regions of space. One of the most dramatic impact these processes can have is to radically alter the gas content of galaxies. This basic fuel underlies the star formation in all galaxies, and by impacting it, the lives of galaxies can be radically transformed. This project will look at the importance and impacts of these environmental and feedback processes on the evolution and gas-content of galaxies through neutral hydrogen observations, in combination with multi wavelength data tracing star formation, AGN activity, and environment. This project will use early science data from ASKAP. Image: M81 group (courtesy of NRAO/AUI) https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5ad0073288251b63162bd21b/5ad008f5aa4a99abb2d83f57/1523844708395/gama.png Students Projects Gallery - The Assembly of Mass and the Periodic Table Potential Supervisors: Martin Meyer, Simon Driver, Aaron Robotham; Research Area: Gas and feedback in galaxies; Multi-wavelength and spectroscopic surveys After the big-bang and recombination, the baryonic `regular’ matter content of the Universe was dominated by the first element on the period table - atomic hydrogen. Over time, that material has been transformed into stars, galaxies, black holes, and the wealth of other different states of matter we see today. Indeed today, neutral atomic hydrogen comprises only relatively small part of the total mass budget of the Universe, yet still exists in significant quantities in galaxies, and continues to play a driving role in their evolution. This project will study the connections between neutral atomic hydrogen (measured in the radio with telescopes such as the Square Kilometre Array and its pathfinders), molecular material (measure through mm observations with the ALMA telescope in CHILE and the ATCA in Australia) and the other major baryonic constituents of galaxies (traced through the rich multi wavelength imaging and spectroscopy of the GAMA survey). How do the scaling relationships between these quantities evolve? And most importantly what are the underlying physical processes that drive the evolution of material from one state to another? Results will be compared to the latest semi-analytic and hydrodynamic simulation runs to assist in this interpretation. Image: Multi-wavelength images from GAMA (credit GAMA team) https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5ad0073288251b63162bd21b/5ad008fd6d2a73d7d2382d68/1523584376544/stacking.png Students Projects Gallery - Faint Astronomical Signals From Galaxies Potential Supervisors: Martin Meyer, Attila Popping, Lister Staveley-Smith, Barbara Catinella; Research Area: Gas and feedback in galaxies; Multi-wavelength and spectroscopic surveys The sheer expanse of the Universe and the dimming of sources with distance presents a significant problem for understanding galaxy evolution, with the emission from increasingly distant objects weakening to the point where they are no longer detectable. While the Square Kilometre Array pathfinder telescopes in Australia and South Africa will vastly increase our ability to directly detect distant emission from neutral atomic hydrogen, these telescopes will still have limits as to the mass and distance of galaxies they can directly study. New methods, involving the statistical combination of the signals from many different galaxies together, can provide a powerful new window through which to advance the observational exploration of the Universe, giving us crucial information on how the average properties of galaxies have changed with time. This project will utilise early science data from the Square Kilometre Array pathfinders (and in particular the DINGO survey on ASKAP), in combination with that from existing facilities, to refine our use of these statistical methods (HI stacking, intensity mapping) and push the boundaries at which we can understand the evolution of this material to the highest redshifts possible. Image: Stacking the emission from 10,000s of galaxies with DINGO and ASKAP. https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5ad0073288251b63162bd21b/5ad008fc575d1fe016bea0fe/1523584305409/rotation+curve.png Students Projects Gallery - Galaxies in Motion - Staring Deep into the Whirlpool Potential Supervisors: Martin Meyer, Danail Obreschkow, Luca Cortese; Research Area: Gas and feedback in galaxies; Multi-wavelength and spectroscopic surveys The material in galaxies is not at rest. In the disks of late-type ‘spiral’ galaxies it orbits galactic centres at ~100,000s of kilometres per hour, on top of local turbulent motions and the more radical processes driving material both in, and out of, galactic disks altogether. The 21cm line of neutral hydrogen is an excellent tracer of these motions, providing unique insight into the dynamical nature of galaxies, their angular momentum, the regulation of galactic structure, and the nature of their hidden dark matter haloes. This project will align neutral atomic hydrogen data from current and future HI surveys (including ASKAP early science data) with that from cutting edge multi-wavelength datasets (including 3-dimensional optical IFU datasets) to shed new light on galaxy dynamics and help understand how the rich diversity of galactic structures in the Universe came to be. How has the angular momentum distribution in galaxies changed with time? What is balance of ordered and random motion? What drives the redistribution of material within galaxies? How do the local dynamical properties of galaxies correlate with their environment? Image: Rotation of NGC2403 captured from HI observations (credit THINGS team) https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/5ad0073288251b63162bd21b/5ad008ff6d2a73d7d2382e10/1523844698896/star+clusters.png Students Projects Gallery - The Sharpest Images from Space - Revealing the Mysterious Lives of Massive Stars Potential Supervisors: Martin Meyer; Anne Pellerin; Research Area: Gas and feedback in galaxies; Multi-wavelength and spectroscopic surveys The unparalleled capabilities of the Hubble Space Telescope lets us capture images of nearby galaxies with such exquisite resolution that individual stars can be identified and classified by type. Using these images, we can gain a much deeper understanding of how massive stars are born, how they leave their stellar nurseries, and the way these stars drive energy into the gas and dust that surrounds them. This project will use optical images from Hubble, space-based infrared images from Spitzer, and radio wavelength images captured from the ground, to understand the way in which stars are born, how they disperse into the star field background, the connections to their gas content, and the way they heat the interstellar medium. It is expected the student will spend time in New York state in the US for collaboration purposes. Image: HST image of NGC131 (credit NASA, ESO, Pellerin) https://static1.squarespace.com/static/52f642bee4b0b19928bf1a67/t/5ad40664aa4a99046717e6a9/1523583594357/ Students Projects Gallery - Revealing the Hidden Universe Potential Supervisors: Martin Meyer, Richard Dodson, Attila Popping; Research Area: Gas and feedback in galaxies; Data intensive astronomy Our understanding of the Universe is dominated by studies at optical wavelengths, and the emission from stars. While such studies have led to huge advances in our understanding of galaxy evolution, they can only reveal part of the picture. A crucial extra ingredient to study is the material that stars are made of - gas. The Square Kilometre Array and its pathfinders will lead to huge advances in this field, enabling studies of the emission from neutral atomic hydrogen at much larger distances than ever before. This project will aim to make use of data from two of the leading deep astronomical surveys currently underway (the CHILES survey being carried out on the Very Large Array in New Mexico, USA, and early science data from the DINGO survey on the Australian Square Kilometre Array Pathfinder) to create some of the most distant images of the atomic hydrogen content of galaxies ever made. These surveys are highly data intensive, with the data products for DINGO ultimately expected to exceed 1PB in size. This project will explore new methods to deliver the best possible survey images and refine the pipelines required to analyse data on such a massive scale. Research work will be carried out on the Galaxy and Magnus supercomputers at Pawsey, along with cutting edge resources available through the Amazon Web Services. Collaboration with colleagues in the United Kingdom is also expected, with this work directly relevant to the successful delivery of science with the Square Kilometre Array. Image: ASKAP (credit CSIRO) https://martinmeyer.squarespace.com/about-1 daily 1.0 2018-04-16 https://martinmeyer.squarespace.com/contact daily 0.75 2018-04-13 https://martinmeyer.squarespace.com/papers2-1 daily 0.75 2018-04-13 https://martinmeyer.squarespace.com/papers daily 0.75 2018-04-13