The support membrane is 10-200 nm of silicon nitride or boron nitride. A thin film is formed of 5-50 pairs of alternate Mo/Si layers with a period of 20-250 A. The beamsplitter resonantly transmits and reflects x-rays through thin film interference effects. The beamsplitter is formed of a wavelength selective multilayer thin film supported by a very thin x-ray transparent membrane. Barbee, Jr., Troy W.Īn x-ray beamsplitter which splits an x-ray beam into two coherent parts by reflecting and transmitting some fraction of an incident beam has applications for x-ray interferometry, x-ray holography, x-ray beam manipulation, and x-ray laser cavity output couplers. A manufacturing plan is outlined for a large IXO-scale program.Ĭeglio, Natale M. Current mandrel fabrication process is capable of meeting the allocated precision requirements for a 5 arcsec telescope. Precision forming mandrels are one element in X-ray mirror development at NASA.
To,p Zhang, Will O'Dell, Stephen Kester, Thomas Jones, William This diffuse X-ray emission is found in every MOXC MSFR, clearly demonstrating that massive star feedback (and the several-million-degree plasmas that it generates) is an integral component of MSFR physics.įorming Mandrels for X-Ray Mirror Substratesīlake, Peter N. In previous work, we have found that this unresolved X-ray emission is dominated by hot plasma from massive star wind shocks. Additionally, we show the morphology of the unresolved X-ray emission that remains after the cataloged X-ray point sources are excised from the ACIS data, in the context of Spitzer and WISE observations that trace the bubbles, ionization fronts, and photon-dominated regions that characterize MSFRs.
MOXC consists of 20,623 X-ray point sources from 12 MSFRs with distances ranging from 1.7 kpc to 50 kpc.
We present the Massive Star- forming Regions (MSFRs) Omnibus X-ray Catalog (MOXC), a compendium of X-ray point sources from Chandra/ACIS observations of a selection of MSFRs across the Galaxy, plus 30 Doradus in the Large Magellanic Cloud. The Massive Star- Forming Regions Omnibus X-Ray Catalog He is now a postdoctoral research scientist at the University of California, San Diego. from Columbia University in July 1999, based partially on results obtained under this investigation. The funding was used primarily for partial salary and travel support for John Tomsick, then a graduate student at Columbia University. Our identification of the source and measurement of the outburst recurrence time, lead to the identification of the source as a Be/ X-ray binary with a spin period of 94.8 s and an orbital period of 241 days. Follow-up observations of this source made with the Wide Field Camera on BeppoSAX showed that the source should be identified with the previously known x-ray pulsar GS 1843-02 which itself is identified with the x-ray source X1845-024 originally discovered with the SAS-3 satellite.
Our initial work lead to the discovery of a hard x-ray transient, GRO J1849-03. The goal of the work was to search for hard x-ray transients in star forming regions using the all-sky hard x-ray monitoring capability of BATSE. This grant funded work on the analysis of data obtained with the Burst and Transient Experiment (BATSE) on the Compton Gamma- Ray Observatory.
" X-Ray Transients in Star- Forming Regions" and "Hard X-Ray Emission from X-Ray Bursters"
SRD 66 X-Ray Form Factor, Attenuation and Scattering Tables (Web, free access)Â Â This database collects tables and graphs of the form factors, the photoabsorption cross section, and the total attenuation coefficient for any element (Z <= 92). National Institute of Standards and Technology Data Gateway X-Ray Form Factor, Attenuation and Scattering Tables