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- W2058906574 abstract "We have used the Wisconsin H-Alpha Mapper to observe the spatially extended distribution of ionized hydrogen in M31 beyond the stellar disk. We obtained five sets of observations, centered near the photometric major axis of M31, that extend from the center of the galaxy to just off the edge of the southwestern H I disk. Beyond the bright stellar disk, but within the H I disk, weak Hα is detected with an intensity IHα = 0.05 R. Since M31 is inclined 77° with respect to the line of sight, this implies that the ambient intergalactic ionizing flux on each side of M31 is Φ0 ≤ 1.6 × 104 photons cm-2 s-1. Just beyond the outer boundary of the H I disk, we find no significant detection of Hα and place an upper limit IHα ≤ 0.019 R." @default.
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- W2058906574 date "2001-10-20" @default.
- W2058906574 modified "2023-09-23" @default.
- W2058906574 title "Observations of the Extended Distribution of Ionized Hydrogen in the Plane of M31" @default.
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- W2058906574 doi "https://doi.org/10.1086/324313" @default.
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