scholarly journals H i observations of galaxies in the southern filament of the Virgo Cluster with the Square Kilometre Array Pathfinder KAT-7 and the Westerbork Synthesis Radio Telescope

2016 ◽  
Vol 464 (1) ◽  
pp. 530-552 ◽  
Author(s):  
A. Sorgho ◽  
K. Hess ◽  
C. Carignan ◽  
T. A. Oosterloo
Keyword(s):  
Radio Telescope ◽  
Virgo Cluster ◽  
Square Kilometre Array

Development of a pilot of an Arecibo-type large spherical radio telescope for the square kilometre array

2001 ◽  
Vol 215 (11) ◽  
pp. 1321-1329 ◽  
Author(s):  
Y X Su ◽  
B Y Duan ◽  
R D Nan ◽  
B Peng
Keyword(s):  
Radio Telescope ◽  
Control Method ◽  
Parallel Manipulators ◽  
Approximate Model ◽  
Fine Tuning ◽  
Tracking Accuracy ◽  
Square Kilometre Array ◽  
Supporting System ◽  
Design Project ◽  
Large Spherical

An optomechatronics design project for the pilot of an Arecibo-type large spherical radio telescope for the square kilometre array (SKA) is proposed, concentrating on the feed-supporting system with large-span cables. The feed-supporting system consists of two parallel manipulators: the parallel cable manipulator, which provides a large workspace for the trajectory tracking and realizes the coarse tracking control, and the fine-tuning Stewart platform, which connects the parallel cable manipulator to the cabin structure and implements the high-accuracy requirement of tracking. In order to improve the real-time controllability, an approximate kinematics model of the parallel cable manipulator is developed using straight links to approximate the cables based on static equilibrium at low tracking velocity. A control strategy for the feed-supporting system is proposed using the independent control method, and the corresponding tracking accuracy of the coarse control and fine tuning is presented. The simulation results have supported the rationale of this approximate model of the parallel cable manipulator and the feasibility of this mechatronics design project for the SKA.

scholarly journals RapidXfer - data transfer framework for square kilometre array

2021 ◽  
Author(s):  
Priyaa Thavasimani
Keyword(s):  
Comparative Study ◽  
Data Management ◽  
Radio Telescope ◽  
Data Transfer ◽  
Grid Data ◽  
Square Kilometre Array ◽  
Advantages And Disadvantages ◽  
End To End

AbstractData Management of Astronomy Data is often a laborious task and it is even more challenging for the extraordinary amounts of data expected from the world’s largest radio telescope, Square Kilometre Array. There are overt issues in transferring the voluminous data and the traditional data transfer methods are fragile especially for the data transfer between two continents. To address this, a new data transfer framework is proposed and the data transfer is achieved using two steps: international and local transfers. The efficiency of different end-to-end data transfer tools used in is evaluated on different dataset sizes. Further, a comparative study of two IRIS grid data transfer methods is made to understand each methods’ advantages and disadvantages. This study can be used as a reference for the development of future SKA’s data transfer operations.

scholarly journals The Australian Square Kilometre Array Pathfinder: Performance of the Boolardy Engineering Test Array

2016 ◽  
Vol 33 ◽  
Author(s):  
D. McConnell ◽  
J. R. Allison ◽  
K. Bannister ◽  
M. E. Bell ◽  
H. E. Bignall ◽  
...  
Keyword(s):  
Image Quality ◽  
Radio Telescope ◽  
Phased Array ◽  
Aperture Synthesis ◽  
Imaging Procedures ◽  
Test Array ◽  
Square Kilometre Array ◽  
Performance Sensitivity ◽  
Beam Characteristics ◽  
Beam Aperture

AbstractWe describe the performance of the Boolardy Engineering Test Array, the prototype for the Australian Square Kilometre Array Pathfinder telescope. Boolardy Engineering Test Array is the first aperture synthesis radio telescope to use phased array feed technology, giving it the ability to electronically form up to nine dual-polarisation beams. We report the methods developed for forming and measuring the beams, and the adaptations that have been made to the traditional calibration and imaging procedures in order to allow BETA to function as a multi-beam aperture synthesis telescope. We describe the commissioning of the instrument and present details of Boolardy Engineering Test Array’s performance: sensitivity, beam characteristics, polarimetric properties, and image quality. We summarise the astronomical science that it has produced and draw lessons from operating Boolardy Engineering Test Array that will be relevant to the commissioning and operation of the final Australian Square Kilometre Array Path telescope.

scholarly journals An HI Search for M81 Group Dwarf Galaxies

1999 ◽  
Vol 186 ◽  
pp. 57-57
Author(s):  
W. Van Driel ◽  
R.C. Kraan-Korteweg ◽  
B. Binggeli ◽  
W.K. Huchtmeier
Keyword(s):  
Radio Telescope ◽  
Local Group ◽  
Dwarf Galaxies ◽  
Dwarf Galaxy ◽  
Virgo Cluster ◽  
Velocity Range ◽  
Group 4 ◽  
Cluster Distance

The M81 group has great advantages for dwarf galaxy studies: it has about three times the dwarf content of the Local Group but is at only about a quarter of the Virgo cluster distance. We searched for HI in 23 optically selected dwarf members and possible members of the M81 group with the Nançay decimetric radio telescope in the velocity range of −529 to 1826 km s−1 with considerably better sensitivity (2–4 mJy rms.) than previous surveys. Half the objects observed are irregular dwarfs, expected to be HI-rich and detectable at Nançay if at the distance of the M81 group (4 Mpc).

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