Pulsar B0950+08 As A Probe Of Turbulence In The Local Bubble

Details Pulsar B0950+08 As A Probe Of Turbulence In The Local Bubble Pulsar B0950+08 As A Probe Of Turbulence In The Local Bubble

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541509s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #415.09; Bulletin of the American Astronomical Society, Vol. 42, p.262

Astronomy and Astrophysics

Astronomy

Scientific paper

The Local Bubble in the interstellar medium (ISM) is a cavity extending for about 150 parsecs in the rough direction of galactic longitude 225 degrees. This cavity is probably filled with a low density, high temperature gas with different characteristics than more extensively diagnosed phases of the ISM. We are particularly interested in the properties of plasma turbulence in this bubble, as revealed by pulsar scintillation. The spectrum and other aspects of this turbulence may differ from that in the denser ISM phases, and it could play an important role in processes such as Galactic cosmic ray transport. The pulsar B0950+08 is particularly well suited for probing the Local Bubble, since it is one of the closest pulsars (262 pc), and much of the line of sight lies within the Local Bubble (Nature 360, 137, 1992; Space Sci. Rev. 143, 277, 2009). To determine how much of the scintillation is due to turbulence within the Local Bubble, we propose to search for arcs in pulsar "secondary spectra" (ApJ 637, 346, 2006). The curvature of these arcs is proportional to the distance to the turbulence responsible for the scintillations. In view of the proximity of B0950+08, and the relative weakness of its scintillations, the observations should be made at a frequency below 100 MHz. We discuss the feasibility of such observations with current and proposed low frequency radio telescopes. This research was supported at the University of Iowa by grant AST-0907911 from the National Science Foundation. Basic research in radio astronomy at the NRL is supported by 6.1 Base funding.

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