J
J. M. Hartman
Researcher at Jet Propulsion Laboratory
Publications - 17
Citations - 1660
J. M. Hartman is an academic researcher from Jet Propulsion Laboratory. The author has contributed to research in topics: Pulsar & Millisecond pulsar. The author has an hindex of 11, co-authored 17 publications receiving 1529 citations. Previous affiliations of J. M. Hartman include United States Naval Research Laboratory & Massachusetts Institute of Technology.
Papers
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Journal ArticleDOI
Thermonuclear (Type I) X-Ray Bursts Observed by the Rossi X-Ray Timing Explorer
Duncan K. Galloway,Duncan K. Galloway,Michael P. Muno,Michael P. Muno,J. M. Hartman,J. M. Hartman,Dimitrios Psaltis,Dimitrios Psaltis,Deepto Chakrabarty +8 more
TL;DR: In this article, a sample of 1187 thermonuclear (type I) X-ray bursts from observations of 48 accreting neutron stars was assembled, spanning more than 10 years.
Journal ArticleDOI
The Long-Term Evolution of the Spin, Pulse Shape, and Orbit of the Accretion-powered Millisecond Pulsar SAX J1808.4–3658
J. M. Hartman,Alessandro Patruno,Deepto Chakrabarty,David L. Kaplan,Craig B. Markwardt,Craig B. Markwardt,Edward H. Morgan,Paul S. Ray,Michiel van der Klis,Rudy Wijnands +9 more
TL;DR: In this paper, a 7-year timing study of the 2.5 ms X-ray pulsar SAX J1808.4-3658 was performed using data from the Rossi X-Ray Timing Explorer covering four transient outbursts (1998-2005).
Journal ArticleDOI
The LWA1 Radio Telescope
Steven W. Ellingson,G. B. Taylor,J. Craig,J. M. Hartman,Jayce Dowell,C. N. Wolfe,Tracy Clarke,Brian C. Hicks,Namir E. Kassim,Paul S. Ray,L. J. Rickard,Frank K. Schinzel,K. W. Weiler +12 more
TL;DR: The LWA1 as discussed by the authors is a radio telescope operating in the frequency range 10-88 MHz, located in central New Mexico, which consists of 258 pairs of dipole-type antennas whose outputs are individually digitized and formed into beams.
Journal ArticleDOI
First light for the first station of the long wavelength array
G. B. Taylor,Steven W. Ellingson,Namir E. Kassim,J. Craig,Jayce Dowell,C. N. Wolfe,J. M. Hartman,Gianni Bernardi,Tracy Clarke,A.S. Cohen,N. P. Dalal,William C. Erickson,Brian C. Hicks,Lincoln J. Greenhill,Bryan A. Jacoby,W. M. Lane,Joseph Lazio,Daniel A. Mitchell,Robert Navarro,Stephen M. Ord,Ylva Pihlström,Emil Polisensky,Paul S. Ray,L. J. Rickard,Frank K. Schinzel,Henrique R. Schmitt,E. Sigman,M. Soriano,K. P. Stewart,Kevin Stovall,S. E. Tremblay,D. Wang,K. W. Weiler,Stephen M. White,D. L. Wood +34 more
TL;DR: The Long Wavelength Array (LWA1) as discussed by the authors is the first large-scale radio telescope with a large number of dual-polarization dipoles, which are digitized and combined into beams.
Journal ArticleDOI
A decade of timing an accretion-powered millisecond pulsar: The continuing spin down and orbital evolution of SAX J1808.4-3658
J. M. Hartman,Alessandro Patruno,Deepto Chakrabarty,C. B. Markwardt,Edward H. Morgan,M. van der Klis,Rudy Wijnands +6 more
TL;DR: The Rossi X-ray Timing Explorer has observed five outbursts from the transient 2.5 ms accretion-powered pulsar SAX J1808.4-3658 during 1998-2008 as discussed by the authors.