The Vela X-1 and alpha Cam Bow Shocks as Probes of the Interstellar Medium

Details The Vela X-1 and alpha Cam Bow Shocks as Probes of the Interstellar Medium The Vela X-1 and alpha Cam Bow Shocks as Probes of the Interstellar Medium

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30174i&link_type=abstract

Spitzer Proposal ID #30174

Physics

Scientific paper

Bow shocks provide a way to probe their energetic environments and reveal properties of both the stellar wind and the ambient interstellar medium. We propose Spitzer IRS spectroscopy and IRAC and MIPS imaging to determine the dust characteristics and spatial variations and resolve filaments within the bow shocks of Vela X-1and alpha Cam. The presence of a bow shock indicates that the system has a high (supersonic) velocity with respect to the interstellar medium, in the process of which dust and gas is accumulated. The strong UV and X-ray radiation fields from the OB stars heat the dust and emission features are expected. The proposed observations, combined with multiwavelength data will permit us to determine hot and cold dust components, their spatial variations, and constrain the physical conditions in the shock interaction regions. The IR forbidden emission lines will determine the ionization structure of the shocked regions.

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