Slide #1.

Astrophysics Research Projects summer 2009 David Cohen See astro.swarthmore.edu/~cohen/students.html for more information.
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Slide #2.

Two projects 1. Analysis of unusually strong X-ray emission from a pair of young, very massive stars. 2. Modeling and analysis of high energy density plasma physics experiments that attempt to reproduce an X-ray nebula in the laboratory.
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Slide #4.

Unusually strong X-rays from Massive stars: Colliding winds or magnetically channeled winds?
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Slide #5.

M 17: The Omega Nebula
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Slide #6.

The Chandra X-ray Observatory (artist’s conception)
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Slide #7.

Simulated Chandra spectrum (above); Chandra imaging (left) shows that the star Kleinmann’s Anonymous Star - is a binary system. See students page on my website for the observing proposal, which describes this project.
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Slide #8.

Colliding Wind X-ray Emission? artist’s conception numerical simulation (density plotted) 2 stars
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Slide #9.

Magnetically Channeled Wind Shocks?
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Slide #10.

The X-ray spectrum will tell us: 1. Line ratios for location of the X-ray emitting plasma 2. Line widths for the plasma kinematics
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Slide #11.

Laboratory Astrophysics: Photoionized plasma around black holes and neutron stars
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Slide #12.

Creating an X-ray photoionized nebula in the laboratory Binary systems with accreting compact objects are very strong X-ray sources
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Slide #13.

Imploding wire array at the Z-machine at Sandia Nat’l Lab is a powerful X-ray source
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Slide #14.

Building a model of the experiment (above) calculating the intensity on the gas cell (left).
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Slide #15.

Model the spectrum of the neon in the gas cell to test predictions of the charge-state distribution See the students page on my website for more details
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