H-alpha from High Velocity Clouds
| dc.creator | Tufte, S. L. | |
| dc.creator | Reynolds, R. J. | |
| dc.creator | Haffner, L. M. | |
| dc.date | 1998-11-17 | |
| dc.date.accessioned | 2026-07-07T02:29:09Z | |
| dc.date.available | 2026-07-07T02:29:09Z | |
| dc.description | Optical emission lines provide an important new window on the HVCs. Recent studies of the H-alpha line reveal that ionized gas is pervasively associated with the neutral hydrogen in HVCs. The Wisconsin H-Alpha Mapper (WHAM) instrument has so far detected H-alpha from high-velocity clouds in the M, A, and C complexes. We find a close spatial correspondence between the neutral and ionized portions of the HVCs with some evidence that the ionized gas envelopes the neutral part of the clouds. The velocities of the H-alpha and 21-cm detections are well correlated, but the intensities are not. If the clouds are photoionized, the H-alpha intensity is a direct measure of the Lyman continuum flux in the Galactic halo. Forthcoming observations of the H-alpha line in combination with other emission lines will give new insights into the high-velocity cloud phenomena and will also probe the physical conditions of their environment. | |
| dc.description | 12 pages, 10 figures. To be published in the Proceedings of the Stromlo Workshop on High Velocity Clouds, eds. B. K. Gibson and M. E. Putnam (ASP Conf. Series) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9811270 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9811270 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/13358 | |
| dc.subject | Astrophysics | |
| dc.title | H-alpha from High Velocity Clouds | |
| dc.type | text |