D
D. J. Helfand
Researcher at Quest University
Publications - 22
Citations - 3301
D. J. Helfand is an academic researcher from Quest University. The author has contributed to research in topics: Galactic plane & Milky Way. The author has an hindex of 14, co-authored 22 publications receiving 2927 citations. Previous affiliations of D. J. Helfand include National Science Foundation.
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Journal ArticleDOI
THE NUCLEAR SPECTROSCOPIC TELESCOPE ARRAY (NuSTAR) HIGH-ENERGY X-RAY MISSION
Fiona A. Harrison,William W. Craig,William W. Craig,Finn Erland Christensen,Charles J. Hailey,William W. Zhang,Steven E. Boggs,Daniel Stern,W. Rick Cook,Karl Forster,Paolo Giommi,Brian W. Grefenstette,Yunjin Kim,Takao Kitaguchi,Jason E. Koglin,Kristin K. Madsen,Peter H. Mao,Hiromasa Miyasaka,Kaya Mori,M. Perri,Michael J. Pivovaroff,Simonetta Puccetti,Vikram Rana,Niels Jørgen Stenfeldt Westergaard,J. L. Willis,Andreas Zoglauer,Hongjun An,Matteo Bachetti,Matteo Bachetti,Nicolas M. Barrière,Eric C. Bellm,Varun Bhalerao,Varun Bhalerao,Nicolai Brejnholt,Felix Fuerst,Carl Christian Liebe,Craig B. Markwardt,Melania Nynka,Julia Vogel,Dominic J. Walton,Daniel R. Wik,David M. Alexander,L. R. Cominsky,Ann Hornschemeier,Allan Hornstrup,Victoria M. Kaspi,Greg Madejski,Giorgio Matt,S. Molendi,David M. Smith,John A. Tomsick,Marco Ajello,David R. Ballantyne,Mislav Baloković,Didier Barret,Didier Barret,Franz E. Bauer,Roger Blandford,W. Niel Brandt,Laura Brenneman,James Chiang,Deepto Chakrabarty,Jérôme Chenevez,Andrea Comastri,Francois Dufour,Martin Elvis,Andrew C. Fabian,Duncan Farrah,Chris L. Fryer,Eric V. Gotthelf,Jonathan E. Grindlay,D. J. Helfand,Roman Krivonos,David L. Meier,Jon M. Miller,Lorenzo Natalucci,Patrick Ogle,Eran O. Ofek,Andrew Ptak,Stephen P. Reynolds,Jane R. Rigby,Gianpiero Tagliaferri,Stephen E. Thorsett,Ezequiel Treister,C. Megan Urry +84 more
TL;DR: The Nuclear Spectroscopic Telescope Array (NuSTAR) as discussed by the authors is the first focusing high-energy X-ray telescope in orbit, which operates in the band from 3 to 79 keV.
Journal ArticleDOI
The Einstein /HEAO 2/ X-ray Observatory
Riccardo Giacconi,G. Branduardi,Ulrich G. Briel,A. Epstein,Daniel G. Fabricant,E. D. Feigelson,William R. Forman,Paul Gorenstein,J. E. Grindlay,H. Gursky,F. R. Harnden,J. P. Henry,C. Jones,E. M. Kellogg,D. Koch,S. S. Murray,Ethan J. Schreier,F. D. Seward,Harvey Tananbaum,K. Topka,L. van Speybroeck,Stephen S. Holt,Robert H. Becker,Elihu Boldt,Peter J. Serlemitsos,George W. Clark,Claude R. Canizares,Thomas H. Markert,Robert Novick,D. J. Helfand,Knox S. Long +30 more
TL;DR: The Einstein X-ray Observatory (HEAO 2) as mentioned in this paper is a fully imaging focusing Xray telescope with an angular resolution of a few arc sec, a field of view of up to one deg, and a sensitivity several hundred times greater than previously available in any Xray astronomy experiment.
Journal ArticleDOI
The Vela Pulsar and its Synchrotron Nebula
TL;DR: In this paper, high-resolution Chandra X-ray observations of PSR B0833-45, the 89 ms pulsar associated with the Vela supernova remnant, were used to search for changes in the pulsar and its environment following an extreme glitch in its rotation frequency.
Journal ArticleDOI
A catalog of small-diameter radio sources in the Galactic plane
TL;DR: In this article, un catalyseur de 1992 radiosource de plan galactique, observees en VLA, comprenant les positions, les densites de flux and les diametres, est presente
Journal ArticleDOI
Discovery of Radio Emission from Transient Anomalous X-ray Pulsar XTE J1810-197
TL;DR: In this paper, the first detection of radio emission from any anomalous X-ray pulsar (AXP) was reported, using data from the Very Large Array MAGPIS survey with angular resolution 6" reveals a point-source of flux density 4.5 +/- 0.5 mJy at 1.4 GHz at the precise location of the 5.54 s pulsar XTE J1810-197.