H. Marshall

Publications413
h-index42
Citations6,972
Highly Influential Citations750
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Astronomical data analysis from remote sites
The development of telescience methodologies for teledesign, teleoperation, and teleanalysis, and the possible verification of these concepts using the Extreme UV Explorer (EUVE) are discussed. The…
The Chandra High Energy Transmission Grating: Design, Fabrication, Ground Calibration and Five Years in Flight
United States. National Aeronautics and Space Administration. George C. Marshall Space Flight Center (Contract NAS8-38249)
Initial Results From The Chandra High Energy Transmission Grating Spectrometer
The High Energy Transmission Grating Spectrometer (HETGS) on the Chandra Xray Observatory provides spectral resolving powers of 200-1000 over the range 0.4-8.0 keV (1.5-30 A ) with e ective area of…
Raytracing with MARX: x-ray observatory design, calibration, and support
MARX is a portable ray-trace program that was originally developed to simulate event data from the trans- mission grating spectrometers on-board the Chandra X-ray Observatory (CXO). MARX has since…
Simultaneous EUVE/ASCA/RXTE Observations of NGC 5548
We present simultaneous observations by EUVE, ASCA, and RXTE of the type?1 Seyfert galaxy NGC?5548. These data indicate that variations in the EUV emission (at ~0.2 keV) appear to lead similar…
X-Ray spectral variability and rapid variability of the soft X-ray spectrum Seyfert 1 galaxies Arakelian 564 and Ton S180
TLDR
There was a trend for soft- and hard-band light curves of both objects to diverge on the longest timescales probed, with the hardness ratio showing a secular change throughout the observations, consistent with the fluctuation power density spectra that showed relatively greater power on long timescale in the softest bands.
The High-Resolution X-Ray Spectrum of SS 433 Using the Chandra HETGS
We present observations of SS 433 using the Chandra High Energy Transmission Grating Spectrometer. Many emission lines of highly ionized elements are detected with relativistic blue and red Doppler…
Complete and Simultaneous Spectral Observations of the Black-Hole X-ray Nova XTE J1118+480
The X-ray nova XTE J1118+480 suffers minimal extinction (b = 62 degrees) and therefore represents an outstanding opportunity for multiwavelength studies. Hynes et al. (2000) conducted the first such…
Chandra Observations of the Young Pulsar PSR B0540–69
The young pulsar PSR B0540-69 was one of the first targets observed with the Chandra X-Ray Observatory. The high angular resolution of Chandra allows us to resolve the compact nebula surrounding the…
Changes in the X-Ray Emission from the Magnetar Candidate 1E 2259+586 during Its 2002 Outburst
An outburst of more than 80 individual bursts, similar to those seen from Soft Gamma Repeaters (SGRs), was detected from the anomalous X-ray pulsar (AXP) 1E 2259+586 in 2002 June. Coincident with…
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