Articles written in Journal of Astrophysics and Astronomy
Volume 32 Issue 4 December 2011 pp 451-455
The Central Point Source in G76.9+1.0
V. R. Marthi J. N. Chengalur Y. Gupta G. C. Dewangan D. Bhattacharya
We describe the serendipitous discovery of a very steep-spectrum radio point source in low-frequency Giant Metrewave Radio Telescope (GMRT) images of the supernova remnant (SNR) G76.9+1.0. The steep spectrum, as well as the location of the point source near the centre of this SNR confirm that this indeed is the pulsar J2022+3842. Archival
Volume 39 Issue 4 August 2018 Article ID 0051 Review
Precision pulsar timing with the ORT and the GMRT and its applications in pulsar astrophysics
BHAL CHANDRA JOSHI PRAKASH ARUMUGASAMY MANJARI BAGCHI DEBADES BANDYOPADHYAY AVISHEK BASU NEELAM DHANDA BATRA SURYARAO BETHAPUDI ARPITA CHOUDHARY KISHALAY DE L. DEY A. GOPAKUMAR Y. GUPTA M. A. KRISHNAKUMAR YOGESH MAAN P. K. MANOHARAN ARUN NAIDU RANA NANDI DHRUV PATHAK MAYURESH SURNIS ABHIMANYU SUSOBHANAN
Radio pulsars show remarkable clock-like stability, which make them useful astronomy tools in experiments to test equation of state of neutron stars and detecting gravitational waves using pulsar timing techniques. A brief review of relevant astrophysical experiments is provided in this paper highlighting thecurrent state-of-the-art of these experiments. A program to monitor frequently glitching pulsars with Indian radio telescopes using high cadence observations is presented, with illustrations of glitches detected in this program, including the largest ever glitch in PSR B0531 $+$ 21. An Indian initiative to discover sub-$\mu$Hz gravitational waves, called Indian Pulsar Timing Array (InPTA), is also described briefly, where time-of-arrival uncertainties and post-fit residuals of the order of $\mu$s are already achievable, comparable to other international pulsar timing array experiments. While timing the glitches and their recoveries are likely to provide constraints on the structure of neutron stars, InPTA will provide upper limits on sub-$\mu$Hz gravitational waves apart from auxiliary pulsarscience. Future directions for these experiments are outlined.
Volume 44 All articles Published: 9 February 2023 Article ID 0011 TECHNICAL REVIEW
High-performance computing for SKA transient search: Use of FPGA-based accelerators
R. AAFREEN R. ABHISHEK B. AJITHKUMAR ARUNKUMAR M. VAIDYANATHAN INDRAJIT V. BARVE SAHANA BHATTRAMAKKI SHASHANK BHAT B. S. GIRISH ATUL GHALAME Y. GUPTA HARSHAL G. HAYATNAGARKAR P. A. KAMINI A. KARASTERGIOU L. LEVIN S. MADHAVI M. MEKHALA M. MICKALIGER5 V. MUGUNDHAN ARUN NAIDU J. OPPERMANN B. ARUL PANDIAN N. PATRA A. RAGHUNATHAN JAYANTA ROY SHIV SETHI B. SHAW K. SHERWIN O. SINNEN S. K. SINHA K. S. SRIVANI B. STAPPERS C. R. SUBRAHMANYA THIAGARAJ PRABU C. VINUTHA Y. G. WADADEKAR HAOMIAO WANG C. WILLIAMS
This paper presents high-performance computing efforts with FPGA for the accelerated pulsar/transient search for the square kilometre array (SKA). Case studies are presented from within SKA and pathfinder telescopes highlighting future opportunities. It reviews the scenario that has shifted from offline processing of the radio telescope data to digitizing several hundreds/thousands of antenna outputs over huge bandwidths, forming several hundreds of beams, and processing the data in the SKA real-time pulsar search pipelines. A briefaccount of the different architectures of the accelerators, primarily, the new generation field programmable gate array-based accelerators, showing their critical roles to achieve high-performance computing and in handlingthe enormous data volume problems of the SKA is presented here. It also presents power-performance efficiency of this emerging technology and presents potential future scenarios.
Volume 44, 2023
Continuous Article Publishing mode
Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.
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