scholarly journals Rapid Fringe Detection Technique for Discovering Radio Transients in Nasu Drift-scan Data

2013 ◽  
Vol 125 (927) ◽  
pp. 557-564
Author(s):  
T. Tanaka ◽  
T. Nakamizo ◽  
T. Aoki ◽  
S. Kida ◽  
K. Asuma ◽  
...  
Keyword(s):  
Detection Technique ◽  
Drift Scan ◽  
Scan Data ◽  
Radio Transients

scholarly journals New Pulsars from Arecibo Drift-Scan Searches

2004 ◽  
Vol 218 ◽  
pp. 127-128 ◽  
Author(s):  
M. A. McLaughlin ◽  
D. R. Lorimer ◽  
D. J. Champion ◽  
K. Xilouris ◽  
Z. Arzoumanian ◽  
...  
Keyword(s):  
Data Processing ◽  
Pulse Profile ◽  
Millisecond Pulsars ◽  
Drift Scan ◽  
Scan Data

We report on new pulsars discovered in Arecibo drift-scan datA. Processing of 2200 deg2 of data has resulted in the detection of 41 known and 12 new pulsars. New pulsars include two millisecond pulsars, one solitary and one binary recycled pulsar, and one pulsar with very unusual pulse profile morphology and complex drifting subpulse behavior.

scholarly journals The hunt for new pulsars with the Green Bank Telescope

2012 ◽  
Vol 8 (S291) ◽  
pp. 41-46
Author(s):  
Ryan S. Lynch
Keyword(s):  
Globular Clusters ◽  
Binary Systems ◽  
Radio Pulsars ◽  
Large Area ◽  
Pulsar Timing ◽  
Drift Scan ◽  
Radio Transients ◽  
Pulsar Searches ◽  
Green Bank Telescope ◽  
Rotating Radio Transients

AbstractThe Green Bank Telescope (GBT) is the largest fully steerable radio telescope in the world and is one of our greatest tools for discovering and studying radio pulsars. Over the last decade, the GBT has successfully found over 100 new pulsars through large-area surveys. Here I discuss the two most recent—the GBT 350 MHz Drift-scan survey and the Green Bank North Celestial Cap survey. The primary science goal of both surveys is to find interesting individual pulsars, including young pulsars, rotating radio transients, exotic binary systems, and especially bright millisecond pulsars (MSPs) suitable for inclusion in Pulsar Timing Arrays, which are trying to directly detect gravitational waves. These two surveys have combined to discover 85 pulsars to date, among which are 14 MSPs and many unique and fascinating systems. I present highlights from these surveys and discuss future plans. I also discuss recent results from targeted GBT pulsar searches of globular clusters and Fermi sources.

scholarly journals Optimization of Survey Strategies for Detecting Slow Radio Transients

2014 ◽  
Vol 31 ◽  
Author(s):  
Jean-Pierre Macquart
Keyword(s):  
Event Detection ◽  
Detection Rate ◽  
Field Of View ◽  
Integration Time ◽  
Transient Event ◽  
Optimal Value ◽  
Drift Scan ◽  
Transient Events ◽  
Radio Transients ◽  
Special Circumstances

AbstractWe investigate the optimal tradeoff between sensitivity and field of view in surveys for slow radio transients using the event detection rate as the survey metric. This tradeoff bears implications for the design of surveys conducted with upcoming widefield radio interferometers, such as the ASKAP VAST survey and the MeerKAT TRAPUM survey. We investigate (i) a survey in which the events are distributed homogeneously throughout a volume centred on the Earth, (ii) a survey in which the events are homogeneously distributed, but are only detectable beyond a certain minimum distance, and (iii) a survey in which all the events occur at an identical distance, as is appropriate for a targetted survey of a particular field which subtends Npoint telescope pointings. For a survey of fixed duration, Tobs, we determine the optimal tradeoff between number of telescope pointings, N, and integration time per field. We consider a population in which the event luminosity distribution follows a power law with index − α, and tslew is the slewing time between fields or, for a drift scan, the time taken for the telescope drift by one beamwidth. Several orders of magnitude improvement in detection rate is possible by optimization of the survey parameters. The optimal value of N for case (i) is Nmax ~ Tobs/4tslew, while for case (iii) we find Nmax = (Lmax/L0)2[(3 − α)/2]2/(α − 1), where Lmax is the maximum luminosity of a transient event and L0 is the minimum luminosity event detectable in an integration of duration Tobs. (The instance Nmax > Npoint in (iii) implies re-observation of fields over the survey area, except when the duration of transient events exceeds that between re-observations of the same field, where Nmax = Npoint applies instead.) We consider the balance in survey optimization between telescope field of view, Ω, and sensitivity, characterised by the minimum detectable flux density, S0. For homogeneously distributed events (i), the detection rate scales as NΩS−3/20, while for targetted events (iii) it scales as NΩS1 − α0. However, if the targetted survey is optimised for N the event detection rate scales instead as ΩS−20. This analysis bears implications for the assessment of telescope designs: the quantity ΩS−20 is often used as the metric of telescope performance in the SKA transients literature, but only under special circumstances is it the metric that optimises the event detection rate.

scholarly journals Discoveries of Rotating Radio Transients in the 350 MHz Green Bank Telescope Drift-scan Survey

2012 ◽  
Vol 8 (S291) ◽  
pp. 107-110
Author(s):  
Chen Karako-Argaman ◽  
Keyword(s):  
Radio Emission ◽  
Post Processing ◽  
Drift Scan ◽  
Radio Transients ◽  
Processing Techniques ◽  
Pulsar Searches ◽  
Green Bank Telescope ◽  
Rotating Radio Transients

AbstractRotating Radio Transients (RRATs) are a class of pulsars characterized by sporadic bursts of radio emission, which make them difficult to detect in typical periodicity-based pulsar searches. Using newly developed post-processing techniques for automatically identifying single bright astrophysical pulses, such as those emitted from RRATs, we have discovered approximately 30 new RRAT candidates in data from the Green Bank Telescope 350 MHz drift-scan survey. A total of 6 of these have already been confirmed and the remainder look extremely promising. Here we describe these techniques and present the most recent results on these new RRAT candidates.

DISCOVERY OF TWO RADIO TRANSIENTS AT A HIGH GALACTIC LATITUDE IN A 1.4 GHz DRIFT-SCAN SURVEY

2009 ◽  
Vol 704 (1) ◽  
pp. 652-660 ◽  
Author(s):  
K. Niinuma ◽  
T. Daishido ◽  
N. Matsumura ◽  
K. Takefuji ◽  
M. Kuniyoshi ◽  
...  
Keyword(s):  
Galactic Latitude ◽  
High Galactic Latitude ◽  
Drift Scan ◽  
Radio Transients

scholarly journals A PRESTO-based parallel pulsar search pipeline used for FAST drift scan data

2020 ◽  
Vol 20 (6) ◽  
pp. 091
Author(s):  
Qiu-Yu Yu ◽  
Zhi-Chen Pan ◽  
Lei Qian ◽  
Shen Wang ◽  
You-Ling Yue ◽  
...  
Keyword(s):  
Drift Scan ◽  
Fast Drift ◽  
Scan Data

Clinical Application and Results of the Assessment of Coronary Blood Flow by the Regional Precordial Xenon Residue Detection Technique

1978 ◽  
Vol 17 (04) ◽  
pp. 161-171
Author(s):  
H.-J. Engel ◽  
H. Hundeshagen ◽  
P. R. Lichtlen
Keyword(s):  
Wall Motion ◽  
High Flow ◽  
Detection Technique ◽  
Fatty Tissue ◽  
Technical Aspects ◽  
Residue Detection ◽  
High Affinity ◽  
Artery Disease ◽  
The Right ◽  
Drug Interventions

Methodological and technical aspects as well as application and results of the precordial Xenon-residue-detection technique are critically reviewed. The results concern mainly normal flow in various regions of the heart esp. in the free wall of the right and left ventricle, poststenotic flow in patients with coronary artery disease in relation to the degree of proximal nar-rowings as well as wall motion of the corresponding LV segment, bypassgraft flow and flow after drug interventions esp. nitrates, betablockers, the calcium-antagonist Nifedipine and the coronary dilator Dipyridamole. In spite of its serious limitations (high affinity of Xenon for fatty tissue, geometrical problems in the assessment of flow and its relation to anatomy, gas exchange in situations of high flow etc.), the technique is found to be a usefull investigatory tool. Due to its technical display and the related high costs routine application is, however, prohibitive.

Template Detection Technique From Assorted Web Pages

2012 ◽  
Vol 2 (9) ◽  
pp. 148-150 ◽  
Author(s):  
Marriboyina Rajendra ◽  
◽  
S. Suresh Babu
Keyword(s):  
Detection Technique ◽  
Web Pages
Sign in / Sign up

Export Citation Format

Share Document