Institution
Swinburne University of Technology
Education•Melbourne, Victoria, Australia•
About: Swinburne University of Technology is a education organization based out in Melbourne, Victoria, Australia. It is known for research contribution in the topics: Galaxy & Population. The organization has 7223 authors who have published 25530 publications receiving 667955 citations. The organization is also known as: Swinburne Technical College & Swinburne College of Technology.
Topics: Galaxy, Population, Redshift, Star formation, Context (language use)
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the authors detect compact, star-forming galaxies (cSFGs) whose number densities, masses, sizes, and star formation rates qualify them as likely progenitors of compact, quiescent, massive galaxies.
Abstract: We combine high-resolution HST/WFC3 images with multi-wavelength photometry to track the evolution of structure and activity of massive (log(M*) > 10) galaxies at redshifts z = 1.4 - 3 in two fields of the Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS). We detect compact, star-forming galaxies (cSFGs) whose number densities, masses, sizes, and star formation rates qualify them as likely progenitors of compact, quiescent, massive galaxies (cQGs) at z = 1.5 - 3. At z > 2 most cSFGs have specific star-formation rates (sSFR = 10^-9 yr^-1) half that of typical, massive SFGs at the same epoch, and host X-ray luminous AGN 30 times (~30%) more frequently. These properties suggest that cSFGs are formed by gas-rich processes (mergers or disk-instabilities) that induce a compact starburst and feed an AGN, which, in turn, quench the star formation on dynamical timescales (few 10^8 yr). The cSFGs are continuously being formed at z = 2 - 3 and fade to cQGs by z = 1.5. After this epoch, cSFGs are rare, thereby truncating the formation of new cQGs. Meanwhile, down to z = 1, existing cQGs continue to enlarge to match local QGs in size, while less-gas-rich mergers and other secular mechanisms shepherd (larger) SFGs as later arrivals to the red sequence. In summary, we propose two evolutionary scenarios of QG formation: an early (z > 2), fast-formation path of rapidly-quenched cSFGs that evolve into cQGs that later enlarge within the quiescent phase, and a slow, late-arrival (z < 2) path for SFGs to form QGs without passing through a compact state.
417 citations
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TL;DR: In this paper, a cosmologically-averaged timescale hTobs(z)i is used to estimate the galaxy merger rate for close galaxy pairs with a range of projected separations.
Abstract: Calculating the galaxy merger rate requires both a census of galaxies identified as merger candidates, and a cosmologically-averaged‘observability’ timescale hTobs(z)ifor identifying galaxy mergers. While many have counted galaxy mergers using a variety of techniques, hTobs(z)i for these techniques have been poorly constrained. We address this problem by calibrating three merger rate estimators with a suite of hydrodynamic merger simulations and three galaxy formation models. We estimate hTobs(z)i for (1) close galaxy pairs with a range of projected separations, (2) the morphology indicator G−M20, and (3) the morphology indicator asymmetry A. Then we apply these timescales to the observed merger fractions at z < 1.5 from the recent literature. When our physically-motivated timescales are adopted, the observed galaxy merger rates become largely consistent. The remaining differences between the galaxy merger rates are explained by the differences in the range of mass-ratio measured by different techniques and differing parent galaxy selection. The major merger rate per unit comoving volume for samples selected with constant number density evolves much more strongly with redshift (∝ (1 + z) +3.0±1.1 ) than samples selected with constant stellar mass or passively evolving luminosity (∝ (1 + z) +0.1±0.4 ). We calculate the minor merger rate (1:4 < Msat/Mprimary . 1:10) by subtracting the major merger rate from close pairs from the ‘total’ merger rate determined by G − M20. The implied minor merger rate is ∼ 3 times the major merger rate at z ∼ 0.7, and shows little evolution with redshift. Subject headings: galaxies:evolution – galaxies:high-redshift – galaxies:interacting – galaxies:structure
414 citations
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TL;DR: In this article, a total of 70 quasi-static tests were conducted on circular 6060 aluminium tubes in the T5, as-received condition and the average crush force, FAV, was non-dimensionalised and an empirical formula established as FAV/MP=72.3(D/t)0.32.
413 citations
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Bielefeld University1, Max Planck Society2, Australia Telescope National Facility3, California Institute of Technology4, National Radio Astronomy Observatory5, Chinese Academy of Sciences6, Goddard Space Flight Center7, Albert Einstein Institution8, ASTRON9, Curtin University10, Cornell University11, INAF12, Pennsylvania State University13, Notre Dame of Maryland University14, University of Orléans15, Centre national de la recherche scientifique16, Peking University17, Hillsdale College18, University of British Columbia19, University of Edinburgh20, West Virginia University21, Vancouver Coastal Health22, University of Amsterdam23, Columbia University24, Monash University25, University of Manchester26, Lafayette College27, Texas Tech University28, University of Virginia29, Paris Diderot University30, Swinburne University of Technology31, University of Birmingham32, University of Wisconsin–Milwaukee33, Oberlin College34, University of New Mexico35, Huazhong University of Science and Technology36, University of Western Australia37, Southwest University38
TL;DR: In this article, the first joint analysis of the data from the three regional pulsar timing arrays (IPTA) is presented, i.e. of the first IPTA data set, and the approach presently followed for its combination and suggest improvements for future PTA research.
Abstract: The highly stable spin of neutron stars can be exploited for a variety of (astro)physical investigations. In particular, arrays of pulsars with rotational periods of the order of milliseconds can be used to detect correlated signals such as those caused by gravitational waves. Three such 'pulsar timing arrays' (PTAs) have been set up around the world over the past decades and collectively form the 'International' PTA (IPTA). In this paper, we describe the first joint analysis of the data from the three regional PTAs, i.e. of the first IPTA data set. We describe the available PTA data, the approach presently followed for its combination and suggest improvements for future PTA research. Particular attention is paid to subtle details (such as underestimation of measurement uncertainty and long-period noise) that have often been ignored but which become important in this unprecedentedly large and inhomogeneous data set. We identify and describe in detail several factors that complicate IPTA research and provide recommendations for future pulsar timing efforts. The first IPTA data release presented here (and available on-line) is used to demonstrate the IPTA's potential of improving upon gravitational-wave limits
412 citations
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TL;DR: An overview of recent advances in fixed-time cooperative control of multiagent systems is presented and several challenging issues that need to be addressed in the near future are raised.
Abstract: Fixed-time cooperative control is currently a hot research topic in multiagent systems since it can provide a guaranteed settling time, which does not depend on initial conditions. Compared with asymptotic cooperative control algorithms, fixed-time cooperative control algorithms can achieve better closed-loop performance and disturbance rejection properties. Different from finite-time control, fixed-time cooperative control produces the faster rate of convergence and provides an explicit estimation of the settling time independent of initial conditions, which is desirable for multiagent systems. This paper aims at presenting an overview of recent advances in fixed-time cooperative control of multiagent systems. Some fundamental concepts about finite- and fixed-time stability and stabilization are first recalled with insight understanding. Then, recent results in finite- and fixed-time cooperative control are reviewed in detail and categorized according to different agent dynamics. Finally, this paper raises several challenging issues that need to be addressed in the near future.
409 citations
Authors
Showing all 7390 results
Name | H-index | Papers | Citations |
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Ramachandran S. Vasan | 172 | 1100 | 138108 |
Karl Glazebrook | 132 | 613 | 80150 |
Neville Owen | 127 | 700 | 74166 |
Michael A. Kamm | 124 | 637 | 53606 |
Zidong Wang | 122 | 914 | 50717 |
Christos Pantelis | 120 | 723 | 56374 |
Warrick J. Couch | 109 | 410 | 63088 |
Gao Qing Lu | 108 | 546 | 53914 |
Paul Mulvaney | 106 | 397 | 45952 |
Alexa S. Beiser | 106 | 366 | 47457 |
A. Roodman | 105 | 1087 | 50599 |
Chris Power | 104 | 477 | 45321 |
Murray D. Esler | 104 | 469 | 41929 |
David Coward | 103 | 400 | 67118 |
Hung T. Nguyen | 102 | 1011 | 47693 |