Upper limits on O VI emission fromVoyager observations |
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Authors: | Jayant Murthy |
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Institution: | (1) Indian Institute of Astrophysics, Koramangala, 560 034 Bangalore, India |
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Abstract: | We have examined 426Voyager fields distributed across the sky for O VI (γγ 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 photons cm?2 sr?1 s?1 on the doublet emission in the direction (l, b) = (117.3, 50.6). 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 photons cm?2 sr?1 s?1 on the O VI emission in 16 of our 426 observations. |
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Keywords: | Galaxy halo ISM general |
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