Institution
Australia Telescope National Facility
Facility•Sydney, New South Wales, Australia•
About: Australia Telescope National Facility is a facility organization based out in Sydney, New South Wales, Australia. It is known for research contribution in the topics: Galaxy & Pulsar. The organization has 699 authors who have published 2774 publications receiving 151507 citations. The organization is also known as: ATNF.
Topics: Galaxy, Pulsar, Millisecond pulsar, Star formation, Radio telescope
Papers published on a yearly basis
Papers
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University of California, Santa Cruz1, Institute for the Physics and Mathematics of the Universe2, Curtin University3, University of Washington4, Swinburne University of Technology5, Australia Telescope National Facility6, Macquarie University7, North Carolina State University8, Gwangju Institute of Science and Technology9, University of Sydney10, Pontifical Catholic University of Valparaíso11
TL;DR: In this article, the authors reported the detection of a fast radio burst (FRB 181112), localized with arcsecond precision, that passes through the halo of a foreground galaxy.
Abstract: Present-day galaxies are surrounded by cool and enriched halo gas extending for hundreds of kiloparsecs. This halo gas is thought to be the dominant reservoir of material available to fuel future star formation, but direct constraints on its mass and physical properties have been difficult to obtain. We report the detection of a fast radio burst (FRB 181112), localized with arcsecond precision, that passes through the halo of a foreground galaxy. Analysis of the burst shows that the halo gas has low net magnetization and turbulence. Our results imply predominantly diffuse gas in massive galactic halos, even those hosting active supermassive black holes, contrary to some previous results.
179 citations
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TL;DR: In this paper, the authors report on new 1.41 GHz Green Bank Telescope (GBT) and 352-MHz Westerbork Synthesis Radio Telescope observations of the Coma cluster and its environs.
Abstract: We report on new 1.41-GHz Green Bank Telescope (GBT) and 352-MHz Westerbork Synthesis Radio Telescope observations of the Coma cluster and its environs. At 1.41 GHz, we tentatively detect an extension to the Coma cluster radio relic source 1253+275 which makes its total extent ∼2 Mpc. This extended relic is linearly polarized as seen in our GBT data, the NRAO VLA Sky Survey, and archival images, strengthening a shock interpretation. The extended relic borders a previously undetected ‘wall’ of galaxies in the infall region of the Coma cluster. We suggest that the radio relic is an infall shock, as opposed to the outgoing merger shocks believed responsible for other radio relics. We also find a sharp edge, or ‘front’, on the western side of the 352-MHz radio halo. This front is coincident with a similar discontinuity in the X-ray surface brightness and temperature in its southern half, suggesting a primary shock-acceleration origin for the local synchrotron emitting electrons. The northern half of the synchrotron front is less well correlated with the X-ray properties, perhaps due to projection effects. We confirm the global pixel-to-pixel power-law correlation between the 352-MHz radio brightness and X-ray brightness with a slope that is inconsistent with predictions of either primary shock acceleration or secondary production of relativistic electrons in giant radio haloes, but is allowable in the framework of the turbulent re-acceleration of relic plasma. The failure of these first-order models and the need for a more comprehensive view of the intracluster medium energization are also highlighted by the very different shapes of the diffuse radio and X-ray emission. We note the puzzling correspondence between the shape of the brighter regions of the radio halo and the surface mass density derived from weak lensing.
179 citations
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TL;DR: In this article, the authors re-examine the disk-halo decompositions of the rotation curves of low surface brightness (LSB) galaxies with V_max > 80 km/s, taking full account of the effects of beam smearing.
Abstract: We re-examine the disk-halo decompositions of the rotation curves of low surface brightness (LSB) galaxies with V_max > 80 km/s, taking full account of the effects of beam smearing. We show that the rotation curves of these LSB galaxies are, contrary to previous claims, consistent with dark halos with steep central cusps in their density distribution. In fact, the spatial resolution of the data is not sufficient to put any meaningful constraints on the density profiles of their dark halos, or on cosmological parameters. This has important implications for numerous claims made in the literature regarding the halos of LSB galaxies, such as the self-similarity of their rotation curves, and their inconsistency with certain cosmological models or with cold dark matter altogether. Only in one case is the data of sufficient spatial resolution to obtain reliable constraints on the slope of the central density distribution of the dark matter halo. For this single case, we find a central density cusp with a slope 0.55 < alpha < 1.26 at the 99.73 percent confidence levels. This contrasts strongly with the results for two dwarf galaxies (V_max < 70 km/s) that we analyze, which yield alpha < 0.5 at the same level of confidence. This possibly suggests that halos with constant density cores are restricted to low-mass systems. We show that violent outflows of baryonic matter by supernovae feedback can reproduce this mass-dependence of halo cusp slopes.
179 citations
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National Radio Astronomy Observatory1, United States Naval Research Laboratory2, Columbia University3, University of Maryland, Baltimore County4, Goddard Space Flight Center5, National Research Council6, SLAC National Accelerator Laboratory7, University of Virginia8, University of Maryland, College Park9, Centre national de la recherche scientifique10, University of Manchester11, Max Planck Society12, University of California, Berkeley13, Australia Telescope National Facility14, George Mason University15, Santa Cruz Institute for Particle Physics16, University of Bordeaux17
TL;DR: The gamma-ray spectra of the pulsars are power law in nature with exponential cutoffs at a few Ge V, as has been found with most other pulsars as discussed by the authors.
Abstract: We searched for radio pulsars in 25 of the non-variable, unassociated sources in the Fermi LAT Bright Source List with the Green Bank Telescope at 820 MHz. We report the discovery of three radio and gamma-ray millisecond pulsar (MSPs) from a high Galactic latitude subset of these sources. All of the pulsars are in binary systems, which would have made them virtually impossible to detect in blind gamma-ray pulsation searches. They seem to be relatively normal, nearby (<= 2 kpc) MSPs. These observations, in combination with the Fermi detection of gamma-rays from other known radio MSPs, imply that most, if not all, radio MSPs are efficient gamma-ray producers. The gamma-ray spectra of the pulsars are power law in nature with exponential cutoffs at a few Ge V, as has been found with most other pulsars. The MSPs have all been detected as X-ray point sources. Their soft X-ray luminosities of approx 10(exp 30) - 10(exp 31) erg/s are typical of the rare radio MSPs seen in X-rays.
179 citations
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University of Melbourne1, Australia Telescope National Facility2, University of Cambridge3, Cardiff University4, University of Bonn5, European Southern Observatory6, Space Telescope Science Institute7, Swinburne University of Technology8, University of Western Sydney9, Mount Stromlo Observatory10, University of Queensland11, University of Central Lancashire12, University of Technology, Sydney13, University of New Mexico14, Arecibo Observatory15, University of Michigan16, University of Sydney17, University of Leicester18, University of Manchester19
TL;DR: The Northern HIPASS catalogue (NHICAT) as mentioned in this paper is the northern extension of the HIPASS catalog, HICAT, which adds the sky area between the declination (Dec) range of +2 degrees 300 km s(-1).
Abstract: The Northern HIPASS catalogue (NHICAT) is the northern extension of the HIPASS catalogue, HICAT. This extension adds the sky area between the declination (Dec.) range of +2 degrees 300 km s(-1). Sources with -300 < nu(hel) < 300 km s(-1) were excluded to avoid contamination by Galactic emission. In total, the entire HIPASS survey has found 5317 galaxies identified purely by their HI content. The full galaxy catalogue is publicly available at http://hipass.aus-vo.org.
179 citations
Authors
Showing all 701 results
Name | H-index | Papers | Citations |
---|---|---|---|
Fabian Walter | 146 | 999 | 83016 |
Lei Zhang | 130 | 2312 | 86950 |
Roger W. Romani | 108 | 453 | 43942 |
Ingrid H. Stairs | 100 | 497 | 35863 |
Bryan Gaensler | 99 | 844 | 39851 |
David Jones | 98 | 420 | 62627 |
Matthew Kerr | 98 | 365 | 36371 |
Fernando Camilo | 97 | 562 | 34657 |
Lister Staveley-Smith | 95 | 599 | 36924 |
Laura Bonavera | 94 | 218 | 59643 |
Richard N. Manchester | 91 | 509 | 36072 |
Christine D. Wilson | 90 | 528 | 39198 |
Andrew M. Hopkins | 90 | 497 | 31604 |
Xing-Jiang Zhu | 89 | 272 | 57629 |
Simon Johnston | 87 | 515 | 27693 |