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Measurements of the Size and Pressure of the Local Bubble Towards Eridanus

Published online by Cambridge University Press:  12 April 2016

D.N. Burrows  and
Z. Guo
D.N. Burrows
Affiliation:
Department of Astronomy & Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA
Z. Guo
Affiliation:
Goddard Space Flight Center, Code 631, Greenbelt, MD 20771, USA

Abstract

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We have measured the size and pressure of the Local Bubble in the direction of the constellation Eridanus using ROSAT PSPC observations of soft X-ray “shadows” cast by neutral clouds against the bright X-ray emission from the Orion-Eridanus superbubble. We discuss the technique and present our results for the size of the Local Bubble in the directions of our shadowing fields. Using these distances and the measured soft X-ray emission measures, we derive the Local Bubble’s thermal pressure. For four lines of sight in Eridanus, we obtain pressures of about 1.2 × 104 K cm−3, in good agreement with measurements in several other directions.

Type
Part V Magnetic Fields, Molecular Clouds, and Interstellar Bubbles
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 279 - 282
Copyright
Copyright © Springer-Verlag 1998

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