Articles written in Journal of Astrophysics and Astronomy
Volume 21 Issue 1-2 June 2000 pp 1-17
A measurement of the cosmic microwave background temperature 1280 MHz
A. Raghunathan Ravi Subrahmanyan
The absolute temperature of the cosmic microwave background (CMB) has been measured at a frequency of 1280 MHz. The observation was made with a modified version of the L-band receiver used in the Giant Metre wavelength Radio Telescope (GMRT): the feed horn was replaced by a corrugated plate and the receiver was placed on the ground, directed at zenith, and shielded from ground radiation by an aluminium screen with corrugated edges. Novel techniques have been adopted for
•reducing and cancelling unwanted contributions to the system temperature of the receiver and
•calibrating the contributions from the feed assembly and receiver.
The thermodynamic temperature of the CMB is estimated to be 3.45 ± 0.78 K.
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.
Click here for Editorial Note on CAP Mode