Results 1 to 10 of about 11,174 (284)
Identifying transient and variable sources in radio images [PDF]
Astronomy and Computing, 2019 With the arrival of a number of wide-field snapshot image-plane radio transient surveys, there will be a huge influx of images in the coming years making it impossible to manually analyse the datasets. Automated pipelines to process the information stored in the images are being developed, such as the LOFAR Transients Pipeline, outputting light curves ...
A Rowlinson +2 more
exaly +6 more sources
Radio variable and transient sources on minute time-scales in the ASKAP pilot surveys
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT We present results from a radio survey for variable and transient sources on 15-min time-scales, using the Australian SKA Pathfinder (ASKAP) pilot surveys. The pilot surveys consist of 505 h of observations conducted at around 1 GHz observing frequency, with a total sky coverage of 1476 deg2.
Yuanming Wang, Tara Murphy, E Lenc
exaly +4 more sources
A new method for short-duration transient detection in radio images: searching for transient sources in MeerKAT data of NGC 5068 [PDF]
Monthly Notices of the Royal Astronomical Society, 2023 ABSTRACT Transient surveys are a vital tool in exploring the dynamic Universe, with radio transients acting as beacons for explosive and highly energetic astrophysical phenomena. However, performing commensal transient surveys using radio imaging can require a significant amount of computing power, data storage, and time.
S Fijma, A Rowlinson, R A M J Wijers
exaly +11 more sources
Search and identification of transient and variable radio sources using MeerKAT observations: a case study on the MAXI J1820+070 field [PDF]
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT Many transient and variable sources detected at multiple wavelengths are also observed to vary at radio frequencies. However, these samples are typically biased towards sources that are initially detected in wide-field optical, X-ray, or gamma-ray surveys.
A Rowlinson, J Bright, S Fijma
exaly +5 more sources
Cooperative Search of Multiple Unknown Transient Radio Sources Using Multiple Paired Mobile Robots [PDF]
IEEE Transactions on Robotics, 2014 We develop a localization method to enable a team of mobile robots to search for multiple unknown transient radio sources. Because of signal source anonymity, short transmission durations, and dynamic transmission patterns, robots cannot treat the radio sources as continuous radio beacons.
Chang-Young Kim +2 more
exaly +5 more sources
Decentralized Searching of Multiple Unknown and Transient Radio Sources with Paired Robots
Engineering, 2015 ABSTRACTIn this paper, we develop a decentralized algorithm to coordinate a group of mobile robots to search for unknown and transient radio sources. In addition to limited mobility and ranges of communication and sensing, the robot team has to deal with challenges from signal source anonymity, short transmission duration, and variable transmission ...
Chang-Young Kim +2 more
exaly +4 more sources
VARIABLE AND TRANSIENT RADIO SOURCES IN THE FIRST SURVEY [PDF]
Astrophysical Journal, 2011 A comprehensive search for variable and transient radio sources has been conducted using ~55,000 snapshot images of the FIRST survey. We present an analysis leading to the discovery of 1,627 variable and transient objects down to mJy levels over a wide range of timescales (few minutes to years).
Richard L White, Robert H Becker
exaly +3 more sources
Simultaneous Localization of Multiple Unknown and Transient Radio Sources Using a Mobile Robot [PDF]
IEEE Transactions on Robotics, 2012 We report system and algorithm developments that utilize a single mobile robot to simultaneously localize multiple unknown transient radio sources. Because of signal source anonymity, short transmission durations, and dynamic transmission patterns, the robot cannot treat the radio sources as continuous radio beacons.
Dezhen Song +2 more
exaly +2 more sources
A radio survey of supersoft, persistent and transient X-ray sources in the Magellanic Clouds [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 We present a radio survey of X-ray sources in the Large and Small Magellanic clouds with the Australia Telescope Compact Array at 6.3 and 3.5 cm. Specifically, we have observed the fields of five LMC and two SMC supersoft X-ray sources, the X-ray binaries LMC X-1, X-2, X-3 & X-4, the X-ray transient Nova SMC 1992, and the soft gamma-ray repeater ...
A K Tzioumis, Fender R P, Tzioumis A K
exaly +3 more sources
Astronomy and Astrophysics, 2023 A large number of fast radio bursts (FRBs) detected with the CHIME telescope have enabled investigations of their energy distributions in different redshift intervals, incorporating the consideration of the selection effects of CHIME. As a result, we obtained a non-evolving energy function (EF) for the high-energy FRBs (HEFRBs) of energies E ≳ 2 × 1038
Zi-Liang Zhang +2 more
exaly +3 more sources