Upper limits on O VI Emission From Voyager

Details Upper limits on O VI Emission From Voyager Upper limits on O VI Emission From Voyager

2001-05-14

arxiv.org/abs/astro-ph/0105214v2

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures accepted ApJ Letters minor editing

Scientific paper

10.1086/323041

We have examined 426 {\it Voyager} fields distributed across the sky for \ion{O}{6} ($\lambda \lambda$ 1032/1038 \AA) 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.

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