Upper limits on O VI Emission From Voyager

Abstract

We have examined 426 {\it Voyager} fields distributed across the sky for \ion{O}{6} ($\lambda \lambda$ 1032/1038 Å) emission from the Galactic diffuse interstellar medium. No such emission was detected in any of our observed fields. Our most constraining limit was a 90% confidence upper limit of 2600 \phunit on the doublet emission in the direction (l, b) = (117\fdegree3, 50\fdegree6). Combining this with an absorption line measurement in nearly the same direction allows us to place an upper limit of 0.01 cm${}^{-3}$ on the electron density of the hot gas in this direction. We have placed 90% confidence upper limits of less than or equal to 10,000 \phunit on the \ion{O}{6} emission in 16 of our 426 observations.

8 pages, 2 figures accepted ApJ Letters minor editing

References in corpus (3)

• Observations of O VI Emission from the Diffuse Interstellar Medium
• FUSE Detection of Diffuse Galactic O VI Emission toward the Coma and Virgo Clusters
• Upper limits on O VI Emission From Voyager

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• Simulations of Supernova Remnants in Diffuse Media III. The Population of Buoyant Remnants Above the Milky Way's Disk
• Astrophysics with New Horizons: Making the Most of a Generational Opportunity
• Opportunities for Astrophysical Science from the Inner and Outer Solar System