Search results for Astrophysics

Search for intermittent X-ray pulsations from neutron stars in low-mass X-ray binaries
Yunus Emre Bahar, Manoneeta Chakraborty, Ersin Göğüş
Journal:

Publications of the Astronomical Society of Australia / Volume 38 / 2021

Published online by Cambridge University Press:

18 March 2021, e011
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We present the results of our extensive binary orbital motion corrected pulsation search for 13 low-mass X-ray binaries. These selected sources exhibit burst oscillations in X-rays with frequencies ranging from 45 to 1 122 Hz and have a binary orbital period varying from 2.1 to 18.9 h. We first determined episodes that contain weak pulsations around the burst oscillation frequency by searching all archival Rossi X-ray Timing Explorer data of these sources. Then, we applied Doppler corrections to these pulsation episodes to discard the smearing effect of the binary orbital motion and searched for recovered pulsations at the second stage. Here we report 75 pulsation episodes that contain weak but coherent pulsations around the burst oscillation frequency. Furthermore, we report eight new episodes that show relatively strong pulsations in the binary orbital motion corrected data.

Australian square kilometre array pathfinder: I. system description
Part of
- Australian SKA Pathfinder
A. W. Hotan, J. D. Bunton, A. P. Chippendale, M. Whiting, J. Tuthill, V. A. Moss, D. McConnell, S. W. Amy, M. T. Huynh, J. R. Allison, C. S. Anderson, K. W. Bannister, E. Bastholm, R. Beresford, D. C.-J. Bock, R. Bolton, J. M. Chapman, K. Chow, J. D. Collier, F. R. Cooray, T. J. Cornwell, P. J. Diamond, P. G. Edwards, I. J. Feain, T. M. O. Franzen, D. George, N. Gupta, G. A. Hampson, L. Harvey-Smith, D. B. Hayman, I. Heywood, C. Jacka, C. A. Jackson, S. Jackson, K. Jeganathan, S. Johnston, M. Kesteven, D. Kleiner, B. S. Koribalski, K. Lee-Waddell, E. Lenc, E. S. Lensson, S. Mackay, E. K. Mahony, N. M. McClure-Griffiths, R. McConigley, P. Mirtschin, A. K. Ng, R. P. Norris, S. E. Pearce, C. Phillips, M. A. Pilawa, W. Raja, J. E. Reynolds, P. Roberts, D. N. Roxby, E. M. Sadler, M. Shields, A. E. T. Schinckel, P. Serra, R. D. Shaw, T. Sweetnam, E. R. Troup, A. Tzioumis, M. A. Voronkov, T. Westmeier
Journal:

Publications of the Astronomical Society of Australia / Volume 38 / 2021

Published online by Cambridge University Press:

05 March 2021, e009
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In this paper, we describe the system design and capabilities of the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope at the conclusion of its construction project and commencement of science operations. ASKAP is one of the first radio telescopes to deploy phased array feed (PAF) technology on a large scale, giving it an instantaneous field of view that covers $31\,\textrm{deg}^{2}$ at $800\,\textrm{MHz}$. As a two-dimensional array of 36$\times$12 m antennas, with baselines ranging from 22 m to 6 km, ASKAP also has excellent snapshot imaging capability and 10 arcsec resolution. This, combined with 288 MHz of instantaneous bandwidth and a unique third axis of rotation on each antenna, gives ASKAP the capability to create high dynamic range images of large sky areas very quickly. It is an excellent telescope for surveys between 700 and $1800\,\textrm{MHz}$ and is expected to facilitate great advances in our understanding of galaxy formation, cosmology, and radio transients while opening new parameter space for discovery of the unknown.

7 - Molecular Regions
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 88-110
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10 - The ISM on the Galactic Scale
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 163-176
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4 - Dust
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 26-42
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11 - The ISM in Other Galaxies and Beyond
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 177-194
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Contents
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp v-viii
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Frontmatter
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp i-iv
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5 - Atomic Regions
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 43-61
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2 - Observations
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 7-14
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Preface
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp ix-x
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Appendix - Constants in SI and cgs Units
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 195-196
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3 - Essential Background Physics
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 15-25
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References
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

Published online:

28 January 2021

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18 February 2021, pp 203-206
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8 - Dynamics
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 111-134
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9 - Star Formation
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 135-162
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Glossary
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 197-202
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6 - Ionized Regions
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

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28 January 2021

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18 February 2021, pp 62-87
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1 - Introduction
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

Published online:

28 January 2021

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18 February 2021, pp 1-6
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Index
Jonathan P. Williams, University of Hawaii, Manoa
Book:

Introduction to the Interstellar Medium

Published online:

28 January 2021

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18 February 2021, pp 207-210
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27945 results in Astrophysics

Search for intermittent X-ray pulsations from neutron stars in low-mass X-ray binaries

Australian square kilometre array pathfinder: I. system description

7 - Molecular Regions

10 - The ISM on the Galactic Scale

4 - Dust

11 - The ISM in Other Galaxies and Beyond

Contents

Frontmatter

5 - Atomic Regions

2 - Observations

Preface

Appendix - Constants in SI and cgs Units

3 - Essential Background Physics

References

8 - Dynamics

9 - Star Formation

Glossary

6 - Ionized Regions

1 - Introduction

Index

Astrophysics

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27945 results in Astrophysics