WHAM Observations of H-alpha from High-Velocity Clouds: Are They Galactic or Extragalactic?

Details WHAM Observations of H-alpha from High-Velocity Clouds: Are They Galactic or Extragalactic? WHAM Observations of H-alpha from High-Velocity Clouds: Are They Galactic or Extragalactic?

2002-06-12

arxiv.org/abs/astro-ph/0206198v1

ApJ, 572:L153-156, 2002 June 20

Astronomy and Astrophysics

Astrophysics

12 pages, 5 eps figures, accepted for publication in ApJ Letters

Scientific paper

10.1086/341667

It has been suggested that high velocity clouds may be distributed throughout the Local Group and are therefore not in general associated with the Milky Way galaxy. With the aim of testing this hypothesis, we have made observations in the H-alpha line of high velocity clouds selected as the most likely candidates for being at larger than average distances. We have found H-alpha emission from 4 out of 5 of the observed clouds, suggesting that the clouds under study are being illuminated by a Lyman continuum flux greater than that of the metagalactic ionizing radiation. Therefore, it appears likely that these clouds are in the Galactic halo and not distributed throughout the Local Group.

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