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Aris Karastergiou

Professor of Astrophysics and Fellow at St Edmund Hall

Research theme

  • Astronomy and astrophysics

Sub department

  • Astrophysics

Research groups

  • MeerKAT
  • Pulsars, transients and relativistic astrophysics
  • The Square Kilometre Array (SKA)
  • Gamma-ray astronomy
Aris.Karastergiou@physics.ox.ac.uk
Telephone: 01865 (2)73642
Denys Wilkinson Building, room 603C
  • About
  • Publications

ALFABURST: A realtime fast radio burst monitor for the Arecibo telescope

The Fourteenth Marcel Grossmann Meeting World Scientific Publishing Co (2017) 2872-2876

Authors:

Jayanth Chennamangalam, Aris Karastergiou, David MacMahon, Wesley G Armour, Jeff Cobb, Duncan Lorimer, Kaustubh Rajwade, Andrew Siemion, Dan Werthimer, Christopher Williams

Abstract:

Fast radio bursts (FRBs) constitute an emerging class of fast radio transient whose origin continues to be a mystery. Realizing the importance of increasing coverage of the search parameter space, we have designed, built, and deployed a realtime monitor for FRBs at the 305-m Arecibo radio telescope. Named `ALFABURST', it is a commensal instrument that is triggered whenever the 1.4 GHz seven-beam Arecibo L-Band Feed Array (ALFA) receiver commences operation. The ongoing commensal survey we are conducting using ALFABURST has an instantaneous field of view of 0.02 sq. deg. within the FWHM of the beams, with the realtime software configurable to use up to 300 MHz of bandwidth. We search for FRBs with dispersion measure up to 2560 cm^-3 pc and pulse widthsranging from 0.128 ms to 16.384 ms. Commissioning observations performed over the past few months have demonstrated the capability of the instrument in detecting single pulses from known pulsars. In this paper, I describe the instrument and the associated survey.
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Pulsar braking and the P–$\dot{P}$ diagram

Monthly Notices of the Royal Astronomical Society 467:3 (2017) 3493-3499

Authors:

S Johnston, A Karastergiou
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SETIBURST: A robotic, commensal, realtime multi-science backend for the Arecibo Telescope

Astrophysical Journal Supplement Series Institute of Physics 228:2 (2017) 21-21

Authors:

J Chennamangalam, D MacMahon, J Cobb, Aris Karastergiou, APV Siemion, K Rajwade, Wesley Armour, V Gajjar, MA McLaughlin, D Werthimer, Christopher Williams

Abstract:

Radio astronomy has traditionally depended on observatories allocating time to observers for exclusive use of their telescopes. The disadvantage of this scheme is that the data thus collected is rarely used for other astronomy applications, and in many cases, is unsuitable. For example, properly calibrated pulsar search data can, with some reduction, be used for spectral line surveys. A backend that supports plugging in multiple applications to a telescope to perform commensal data analysis will vastly increase the science throughput of the facility. In this paper, we present "SETIBURST," a robotic, commensal, realtime multi-science backend for the 305 m Arecibo Telescope. The system uses the 1.4 GHz, seven-beam Arecibo L-band Feed Array (ALFA) receiver whenever it is operated. SETIBURST currently supports two applications: SERENDIP VI, a SETI spectrometer that is conducting a search for signs of technological life, and ALFABURST, a fast transient search system that is conducting a survey of fast radio bursts (FRBs). Based on the FRB event rate and the expected usage of ALFA, we expect 0-5 FRB detections over the coming year. SETIBURST also provides the option of plugging in more applications. We outline the motivation for our instrumentation scheme and the scientific motivation of the two surveys, along with their descriptions and related discussions.
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Depot Dependent Effects of Dexamethasone on Gene Expression in Human Omental and Abdominal Subcutaneous Adipose Tissues from Obese Women

PLOS ONE Public Library of Science (PLoS) 11:12 (2016) e0167337

Authors:

R Taylor Pickering, Mi-Jeong Lee, Kalypso Karastergiou, Adam Gower, Susan K Fried
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A framework for assessing the performance of pulsar search pipelines

Monthly Notices of the Royal Astronomical Society Oxford University Press 467:2 (2016) 1661-1677

Authors:

Elmarie van Heerden, Aris Karastergiou, Stephen J Roberts

Abstract:

In this paper, we present a framework for assessing the effect of non-stationary Gaussian noise and radio frequency interference (RFI) on the signal to noise ratio, the number of false positives detected per true positive and the sensitivity of standard pulsar search pipelines. The results highlight the necessity to develop algorithms that are able to identify and remove non-stationary variations from the data before RFI excision and searching is performed in order to limit false positive detections. The results also show that the spectrum whitening algorithms currently employed, severely affect the efficiency of pulsar search pipelines by reducing their sensitivity to long period pulsars.
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