Search Results for the-transient-radio-sky

The high time-resolution radio sky represents unexplored astronomical territory. This thesis presents a study of the transient radio sky, focussing on millisecond scales. As such, the work is concerned primarily with neutron stars.

Author: Evan Francis Keane

Publisher: Springer Science & Business Media

ISBN: 3642196276

Category: Science

Page: 190

View: 975

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The high time-resolution radio sky represents unexplored astronomical territory. This thesis presents a study of the transient radio sky, focussing on millisecond scales. As such, the work is concerned primarily with neutron stars. In particular this research concentrates on a recently identified group of neutron stars, known as RRATs, which exhibit radio bursts every few minutes to every few hours. After analysing neutron star birthrates, a re-analysis of the Parkes Multibeam Pulsar Survey is described which has resulted in the discovery of 19 new transient radio sources. Of these, 12 have been seen to repeat and a follow-up campaign of observations has been undertaken. These studies have greatly increased our knowledge of the rotational properties of RRATs and enable us to conclude that they are pulsars with extreme nulling and/or pulse-to-pulse modulation. Although the evolution of neutron stars post-supernova is not yet understood, it seems that RRATs fit into the emerging picture in which pulsar magnetospheres switch between stable configurations.
2011-07-16 By Evan Francis Keane

Median Stacking and a New 1.4 GHz Survey of the Sloan Digital Sky Survey
Southern Equatorial Stripe Jacqueline ... classes of sources continue to be
discovered , such as the mysterious rotating radio transients ( RRAT ; McLaughlin
et al .

Author: Jacqueline Alleen Hodge

Publisher:

ISBN: UCAL:X85156

Category:

Page: 430

View: 156

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While radio transients motivated Jansky's work, the celestial radio emission that
he discovered was itself steady. Indeed, a New York Times headline announcing
the discovery noted that its constancy was likely an indication that the emission ...

Author: Domingos Barbosa

Publisher: Springer Science & Business Media

ISBN: 9783642227943

Category: Science

Page: 118

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: The Square Kilometre Array (SKA) will provide more than one order of magnitude improvement in sensitivity compared with any existing radio telescope over a wavelength range of several hundred to one, from decametric to microwave wavelengths. It will revolutionize the study of the most abundant element in the Universe, hydrogen, from the epoch of reionisation to the present-day, probing the onset formation period of the very first stars, will closely scan proto-planets and, through the precision timing of pulsars, will detect the distortions of space-time due to gravitational radiation. The SKA is a sensing network spanning 3000 km from its centre and with a collecting area of more than 1 square kilometre, using technologies of the 21st century. The SKA will make the study of a wide range of phenomena initially studied at other wavelengths possible at radio wavelengths, as well as opening a new discovery window on new phenomena at radio wavelengths. Symposium 7 of the JENAM 2010 aimed at bringing these diverse opportunities to the attention of both theoretical and observational astronomers working at all wavelengths, including the potential for synergies with other facilities. The meeting highlighted the scientific potential of the SKA, discussed scientific priorities and their impact on the design of the SKA, explored the synergies between the SKA and other next-generation astronomical facilities in different wavelength domains such as the ALMA, ELTs, LSST, JWST, GRE, IXO, Gaia and Euclid, and high-energy facilities (Auger), explored the “cyber–infrastructure” that may become available for the distribution and distributed analysis of SKA data.
2012-01-13 By Domingos Barbosa

Consequently, most transient radio studies have been follow-up observations of
events first detected at higher energies. ... regions of radio transient phase-space
in Fig.3.1 intrinsic or simply due to our poor sampling of the transient radio sky?

Author: Werner Becker

Publisher: Springer Science & Business Media

ISBN: 9783540769651

Category: Science

Page: 697

View: 332

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Neutron stars are the most compact astronomical objects in the universe which are accessible by direct observation. Studying neutron stars means studying physics in regimes unattainable in any terrestrial laboratory. Understanding their observed complex phenomena requires a wide range of scientific disciplines, including the nuclear and condensed matter physics of very dense matter in neutron star interiors, plasma physics and quantum electrodynamics of magnetospheres, and the relativistic magneto-hydrodynamics of electron-positron pulsar winds interacting with some ambient medium. Not to mention the test bed neutron stars provide for general relativity theories, and their importance as potential sources of gravitational waves. It is this variety of disciplines which, among others, makes neutron star research so fascinating, not only for those who have been working in the field for many years but also for students and young scientists. The aim of this book is to serve as a reference work which not only reviews the progress made since the early days of pulsar astronomy, but especially focuses on questions such as: "What have we learned about the subject and how did we learn it?", "What are the most important open questions in this area?" and "What new tools, telescopes, observations, and calculations are needed to answer these questions?". All authors who have contributed to this book have devoted a significant part of their scientific careers to exploring the nature of neutron stars and understanding pulsars. Everyone has paid special attention to writing educational comprehensive review articles with the needs of beginners, students and young scientists as potential readers in mind. This book will be a valuable source of information for these groups.
2009-02-11 By Werner Becker

For the radio astronomer there is now the realization that the radio sky could be
filled with interesting , transient radio sources blinking on and off — and without a
fantastic stroke of luck or serendipity we would never know about most of them .

Author:

Publisher:

ISBN: UOM:39015019256323

Category: Astronomy

Page:

View: 377

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1974 By

... since freezing rain occurred only below certain altitudes , the exposure to the
condition would be a transient one . ... In many cases the radio antenna is in a
location where it does not accumulate ice or the performance of the radio is not ...

Author: System Development Corporation

Publisher:

ISBN: CORNELL:31924004635078

Category: Helicopter transportation

Page:

View: 471

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X - ray transients have also been detected ; some of these are associated with
transient radio sources . In the near future , an all - sky monitor will be launched
on the X - ray Transient Explorer . An all - sky radio monitor is needed to detect
any ...

Author: Massachusetts Institute of Technology. Research Laboratory of Electronics

Publisher:

ISBN: UVA:X002492918

Category: Electronics

Page:

View: 946

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The ATA will do for the radio sky what the Sloan Digital Sky Survey has recently
done for the optical sky . And it will do it so rapidly that it will also provide the first
systematic look at the transient radio universe . The ATA provides simultaneous ...

Author: International Astronomical Union

Publisher:

ISBN: UOM:39015068668006

Category: Astronomy

Page:

View: 978

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Vol. 1- contain papers, etc., from 13th- General Assembly.

The advantages of all - sky surveys have been illustrated by the spectacular
success of the Sloan Digital Sky Survey ( done with a modestly sized telescope ) .
The transient sky is virtually untouched by radio telescopes , and would greatly ...

Author: Donald C. Backer

Publisher: Astronomical Society of the pacific

ISBN: UVA:X030220175

Category: Science

Page: 314

View: 579

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This paper discusses the transient radio sky . Examples of transient radio signals
are known that range from 0.4 ns and longer in time scale with apparent
brightness temperatures from thermal to 1042 K. However , compared to the
highenergy ...

Author: Alan H. Bridle

Publisher: Astronomical Society of the pacific

ISBN: STANFORD:36105129057589

Category: Science

Page: 390

View: 741

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"In celebration of its 50th anniversary, the NRAO hosted a science symposium highlighting the most important questions that can be addressed by astronomers. The universe is a unique laboratory yielding historical data on the creation of the universe, the formation of the first stars and galaxies, the production of the elements, the assembly of molecules and the building blocks of life in interstellar space, how and where planets form, and possible changes in fundamental physical constants on cosmological time scales. This "laboratory" contains black holes, neutron stars, and gravitational radiation for studying extreme gravity and extremely dense matter. It is filled with the mysterious dark energy and dark matter that control the expansion and destiny of the universe, and whose nature is a critical unsolved problem for physics. This symposium brought together leading scientists to address the most important questions in these areas, the major contributions to astronomy enabled by NRAO instruments-past, present, and future - and to suggest future directions for research involving radio observations and techniques."--BOOK JACKET.
2008 By Alan H. Bridle

Hewish had joined Ryle ' s research group in Cambridge in 1946 , and his
interests in the transient effects of the earth ' s ionosphere on radio waves
ultimately placed him with the capability to detect the rapid variations from the
pulsars .

Author: Donald D. Clayton

Publisher: Crown

ISBN: UCAL:B4178705

Category: Cosmology

Page: 206

View: 272

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The ATA will do for the radio sky what the Sloan Digital Sky Survey has recently
done for the optical sky . And it will do it so rapidly that it will also provide the first
systematic look at the transient radio universe . The ATA provides simultaneous ...

Author: Karel van der Hucht

Publisher: Cambridge University Press

ISBN: 0521896835

Category: Science

Page: 727

View: 668

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Provides a broad overview of modern astrophysics for graduate students and researchers.
2008-01-21 By Karel van der Hucht

We report on the initial results of the first large scale survey for transient radio
sources along the Galactic plane . ... Radio astronomy has a long history of
attempts to probe the transient radio sky , culminating in many exciting
discoveries , most ...

Author: Società astronomica italiana

Publisher:

ISBN: UOM:39015058988570

Category: Astronomy

Page:

View: 260

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Author:

Publisher:

ISBN: STANFORD:36105016612710

Category: Aeronautics

Page:

View: 310

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1993 By

... the radio sky exemplified general physical and mathematical principles . The
central principle involved the mathematical relationship known as a “ Fourier
transform . " ' 15 Fourier had demonstrated that any complex , transient waveform
can ...

Author: David O. Edge

Publisher: John Wiley & Sons

ISBN: UCAL:B4264116

Category: Astronomy

Page: 482

View: 692

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1976 By David O. Edge

Proceedings of an NRAO Workshop Held at the National Radio Astronomy
Observatory, Green Bank, West Virginia, September 28, 29, 30, 1987 James
Justin Condon, Felix J. Lockman. TABLE 3 . RESULTS 1 HIGHLIGHTS ) 1 . First
catalog ...

Author: James Justin Condon

Publisher:

ISBN: UOM:39015056623948

Category: Astronomy

Page: 160

View: 438

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A 77-min rotation period radio pulsar is excluded because the rotational energy
loss rate from such a pulsar is insufficient to ... This scenario does not explain the
transient behaviour from the source or the lack of interburst emission, and ... The
2MASS All-sky Catalog of Point Sources (University of Massachusetts and
Infrared Processing and Analysis Center, IPAC/California Institute of Technology,
2003).

Author: Sir Norman Lockyer

Publisher:

ISBN: UIUC:30112075217221

Category: Electronic journals

Page:

View: 606

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2005-03 By Sir Norman Lockyer

Database Techniques within LOFAR's Transients Key Project Bart Scheers , on
behalf of the LOFAR Transients Key Project ... The instrument is sensitive in the
30-240 MHz frequency range , and one of its key features is the Radio Sky
Monitor ...

Author: David A. Bohlender

Publisher:

ISBN: CHI:092084406

Category: Astronomy

Page: 588

View: 558

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This investigation however led to the identification of the optical counterpart of an
X - ray and radio source , very likely a group of active galaxies ( 13 ) and to the
discovery of a variable red object , probably an eclipsing binary ( 16 ) . Guarnieri
 ...

Author: L. Scarsi

Publisher: North Holland

ISBN: UOM:39015043125122

Category: Science

Page: 743

View: 295

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The conference on Active X-Ray Sky was held approximately two years after the launch of the Rossi-Xte and RXTE satellites. The objective of these proceedings was to incorporate results not only from these two missions, but to review recent developments about the Active X-ray Sky as obtained from the four currectly active X-ray missions, as well as from the Copton Gamma-ray Observatory. Some of the very dramatic findings were: the discovery of X-ray and optical afterglow in Gamma Ray Bursts; the discovery of X-ray oscillations at kilohertz frequencies from binary systems and the discovery of correlated IR flares, radio flares and X-ray dip-flare cycles in microquasars. These results have yielded dramatic new insights into our physical universe. Other important results reported or reviewed here include the detection of extreme high-energy emission in the active binary stars Algol and UX Ari, resonant absorption scattering from the Perseus Cluster, and cyclotron lines from pulsars. These and many other recent and important results are published here, resulting in a state-of-art review by experts currently active in the field.
1998-09-03 By L. Scarsi

... the beams that track the sky have more than upper limit to the abundance ratio
of atomic deuterium to 10 dB additional ... The transient excision brightness
model , Radio Sci . , 39 , RS2023 , doi : 10.1029 / 2003RSO03016 . results ...

Author:

Publisher:

ISBN: UIUC:30112106705616

Category: Radio meteorology

Page:

View: 139

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