scholarly journals The UTMOST survey for magnetars, intermittent pulsars, RRATs, and FRBs – I. System description and overview

2020 ◽  
Vol 492 (4) ◽  
pp. 4752-4767 ◽  
Author(s):  
V Venkatraman Krishnan ◽  
C Flynn ◽  
W Farah ◽  
A Jameson ◽  
M Bailes ◽  
...  
Keyword(s):  
Galactic Plane ◽  
Single Pulse ◽  
Wide Field ◽  
Flux Limit ◽  
Wide Field Of View ◽  
Survey Results ◽  
Average Flux ◽  
Early Survey ◽  
Radio Transients

ABSTRACT We describe the ongoing ‘survey for magnetars, intermittent pulsars, rotating radio transients, and fast radio bursts’ (SMIRF), performed using the newly refurbished UTMOST telescope. SMIRF repeatedly sweeps the southern Galactic plane performing real-time periodicity and single pulse searches, and is the first survey of its kind carried out with an interferometer. SMIRF is facilitated by a robotic scheduler which is capable of fully autonomous commensal operations. We report on the SMIRF observational parameters, the data analysis methods, the survey’s sensitivity to pulsars, techniques to mitigate radio frequency interference, and present some early survey results. UTMOST’s wide field of view permits a full sweep of the Galactic plane to be performed every fortnight, two orders of magnitude faster than previous surveys. In six months of operations from 2018 January to June, we have performed ∼10 sweeps of the Galactic plane with SMIRF. Notable blind redetections include the magnetar PSR J1622−4950, the RRAT PSR J0941−3942 and the eclipsing pulsar PSR J1748−2446A. We also report the discovery of a new pulsar, PSR J1659−54. Our follow-up of this pulsar at an average flux limit of ≤20 mJy, categorizes this as an intermittent pulsar with a high nulling fraction of <0.002.

scholarly journals The ALFA Zone of Avoidance Survey: Results from the Precursor Observations

2007 ◽  
Vol 3 (S244) ◽  
pp. 383-384
Author(s):  
C. M. Springob ◽  
P. A. Henning ◽  
B. Catinella ◽  
F. Day ◽  
R. Minchin ◽  
...  
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Galactic Plane ◽  
Significant Fraction ◽  
Galactic Latitude ◽  
Substantial Fraction ◽  
Survey Results ◽  
L Band ◽  
Zone Of Avoidance

AbstractThe Arecibo L-band Feed Array Zone of Avoidance Survey (ALFA ZOA) will map 1350-1800 deg2 at low Galactic latitude, providing HI spectra for galaxies in regions of the sky where our knowledge of local large scale structure remains incomplete, owing to obscuration from dust and high stellar confusion near the Galactic plane. Because of these effects, a substantial fraction of the galaxies detected in the survey will have no optical or infrared counterparts. However, near infrared follow up observations of ALFA ZOA sources found in regions of lowest obscuration could reveal whether some of these sources could be objects in which little or no star formation has taken place (“dark galaxies”). We present here the results of ALFA ZOA precursor observations on two patches of sky totaling 140 deg2 (near l = 40°, and l = 192°). We have measured HI parameters for detections from these observations, and cross-correlated with the NASA/IPAC Extragalactic Database (NED). A significant fraction of the objects have never been detected at any wavelength. For those galaxies that have been previously detected, a significant fraction have no previously known redshift, and no previous HI detection.

scholarly journals FRATs: Searching for Fast Radio Transients in Real Time with LOFAR

2011 ◽  
Vol 7 (S285) ◽  
pp. 411-413 ◽  
Author(s):  
S. ter Veen ◽  
P. Schellart ◽  
H. Falcke
Keyword(s):  
Real Time ◽  
Time Resolution ◽  
Field Of View ◽  
High Time Resolution ◽  
Wide Field ◽  
Crab Pulsar ◽  
Giant Pulse ◽  
Wide Field Of View ◽  
Trigger Algorithm ◽  
Radio Transients

AbstractThe aim of the FRATs project is to detect single dispersed pulses from Fast Radio Transients with LOFAR in real time. The pulses can originate from pulsars, RRATS and other classes of known or unknown objects. To detect the pulses a trigger algorithm is run on an incoherent beam from the different LOFAR stations. The beam has a wide field of view and can be formed parallel to other observations. A precise localisation is achieved by storing and processing off-line the data from each dipole, giving all-sky coverage with a spatial resolution of the order of arc-seconds. The source is identified by making high-time-resolution images. The method has been tested by detecting and identifying a giant pulse from the Crab pulsar.

scholarly journals NEOPAT: Near-Earth Object PATrol program

2001 ◽  
Vol 183 ◽  
pp. 240-244
Author(s):  
Hong-Kyu Moon ◽  
Moo-Young Chun ◽  
Yong-Ik Byun ◽  
Wonyong Han ◽  
Seung-Lee Kim ◽  
...  
Keyword(s):  
High Efficiency ◽  
Wide Field ◽  
Main Belt ◽  
Earth Object ◽  
Data Pipeline ◽  
Wide Field Of View ◽  
Survey System ◽  
Robotic Telescopes ◽  
Astronomical Research

AbstractIn 2000, Korea Astronomy Observatory launched the Near-Earth Object Patrol (NEOPAT) program. NEOPAT has conducted follow-up observations of NEOCP (NEO Confirmation Page) objects and discovered 52 new main-belt asteroids during the observation runs. We initiated collaboration with the Yonsei Survey Telescopes for Astronomical Research (YSTAR) team for NEO search. Wide-field of view, fast read-out time, and fully autonomous data pipeline will enable us to detect and track NEOs with a high efficiency. Scheduled to begin active operations in mid-2001, our survey system is going to be the first network of robotic telescopes for NEO search with automatic access to both hemispheres.

scholarly journals Okayama Astrophysical Observatory Wide-Field Camera

2019 ◽  
Vol 71 (6) ◽  
Author(s):  
Kenshi Yanagisawa ◽  
Yasuhiro Shimizu ◽  
Kiichi Okita ◽  
Daisuke Kuroda ◽  
Hironori Tsutsui ◽  
...  
Keyword(s):  
Focal Plane ◽  
Near Infrared ◽  
Galactic Plane ◽  
Focal Plane Array ◽  
Variable Stars ◽  
Field Of View ◽  
Wide Field

Abstract We report on the development of a wide-field near-infrared (0.9–2.5$\, \mu$m) camera built as a renewal of the existing classical Cassegrain 0.91 m telescope at Okayama Astrophysical Observatory. The optics system was replaced with fast hybrid optics (f/2.5) composed of forward Cassegrain optics and quasi-Schmidt optics, which results in an effective image circle of 52 mm diameter on the focal plane. The new camera, called the Okayama Astrophysical Observatory Wide-Field Camera (OAOWFC), has imaging capabilities in the $Y$, $J$, $H$, and $K_{\rm s}$ bands over a field of view of $0.^{\!\!\!\circ }47 \times 0.^{\!\!\!\circ }47$ with a HAWAII-1 HgCdTe PACE focal plane array. The primary purpose of OAOWFC is to search for variability in the Galactic plane in the $K_{\rm s}$ band and to promptly follow up transients. We have demonstrated a photometric repeatability of 2% in the densest field in the northern Galactic plane and successfully discovered previously unreported variable stars. The observations of OAOWFC are fully autonomous, and we started scientific operations in 2015 April.

scholarly journals The First EUV Survey: White Dwarfs and Cool Stars

1992 ◽  
Vol 9 ◽  
pp. 241-245
Author(s):  
C. Jordan ◽  
K.A. Pounds
Keyword(s):  
White Dwarfs ◽  
Galactic Plane ◽  
Cataclysmic Variables ◽  
Wide Field ◽  
Late Type ◽  
Systematic Analysis ◽  
Cool Stars ◽  
To Come ◽  
Galactic Longitude

AbstractPreliminary results from the survey carried out with the Wide Field Camera (WFC) on ROS AT are presented. 732 sources were detected, of which 230 were observable in both the S1 and S2 filters. The distribution of sources with galactic longitude, near the galactic plane, shows the greatest number in the quadrant where H I absorption is least. The identifiable sources include a high proportion of hot white dwarfs and ‘normal’ late-type stars. The optical follow-up programme has identified over 40 new white dwarfs and over 60 late-type stars including RS CVn systems and cataclysmic variables. Emission from some A stars detected appears to come from white dwarf companions. Individual sources of particular interest are discussed. The systematic analysis of a sample of late-type stars has begun.

scholarly journals Tiling strategies for optical follow-up of gravitational-wave triggers by telescopes with a wide field of view

2016 ◽  
Vol 592 ◽  
pp. A82 ◽  
Author(s):  
Shaon Ghosh ◽  
Steven Bloemen ◽  
Gijs Nelemans ◽  
Paul J. Groot ◽  
Larry R. Price
Keyword(s):  
Gravitational Wave ◽  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View

scholarly journals Using machine learning for transient classification in searches for gravitational-wave counterparts

2020 ◽  
Vol 497 (2) ◽  
pp. 1320-1331 ◽  
Author(s):  
Cosmin Stachie ◽  
Michael W Coughlin ◽  
Nelson Christensen ◽  
Daniel Muthukrishna
Keyword(s):  
Gravitational Wave ◽  
Classification Performance ◽  
Light Curves ◽  
Wide Field ◽  
Photometric Observations ◽  
Wide Field Of View ◽  
Astronomical Object ◽  
The Many ◽  
Rule Out

ABSTRACT The large sky localization regions offered by the gravitational-wave interferometers require efficient follow-up of the many counterpart candidates identified by the wide field-of-view telescopes. Given the restricted telescope time, the creation of prioritized lists of the many identified candidates becomes mandatory. Towards this end, we use astrorapid, a multiband photometric light-curve classifier, to differentiate between kilonovae, supernovae, and other possible transients. We demonstrate our method on the photometric observations of real events. In addition, the classification performance is tested on simulated light curves, both ideally and realistically sampled. We show that after only a few days of observations of an astronomical object, it is possible to rule out candidates as supernovae and other known transients.

STM studies of crystal growth

1991 ◽  
Vol 49 ◽  
pp. 374-375
Author(s):  
M. G. Lagally
Keyword(s):  
Crystal Growth ◽  
Molecular Beam ◽  
Chemical Vapor ◽  
Sputter Deposition ◽  
Field Of View ◽  
Scanning Tunneling ◽  
Wide Field ◽  
Tunneling Microscopy ◽  
Wide Field Of View ◽  
The One

It has been recognized since the earliest days of crystal growth that kinetic processes of all Kinds control the nature of the growth. As the technology of crystal growth has become ever more refined, with the advent of such atomistic processes as molecular beam epitaxy, chemical vapor deposition, sputter deposition, and plasma enhanced techniques for the creation of “crystals” as little as one or a few atomic layers thick, multilayer structures, and novel materials combinations, the need to understand the mechanisms controlling the growth process is becoming more critical. Unfortunately, available techniques have not lent themselves well to obtaining a truly microscopic picture of such processes. Because of its atomic resolution on the one hand, and the achievable wide field of view on the other (of the order of micrometers) scanning tunneling microscopy (STM) gives us this opportunity. In this talk, we briefly review the types of growth kinetics measurements that can be made using STM. The use of STM for studies of kinetics is one of the more recent applications of what is itself still a very young field.

Design and verification of high-precision multi-star simulator with a wide field of view

2020 ◽  
Vol 13 (6) ◽  
pp. 1-9
Author(s):  
XU Hong-gang ◽  
◽  
HAN Bing ◽  
LI Man-li ◽  
MA Hong-tao ◽  
...  
Keyword(s):  
High Precision ◽  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View
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