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Distance Constraints for High Velocity Clouds from Optical Emission Lines | | Benjamin J. Weiner
; Stuart N. Vogel
; T.B. Williams
; | | Date: |
17 Aug 2000 | | Subject: | astro-ph | | Affiliation: | OCIW), Stuart N. Vogel (Maryland), T.B. Williams (Rutgers | | Abstract: | We report results from a survey of high velocity clouds and the Magellanic Stream for faint, diffuse optical recombination emission lines. We detect H-alpha emission with surface brightness from 41 to 1680 milli-Rayleighs (mR) from HVCs, and from <40 to 1360 mR in the MS. A simple model for the photoionizing radiation emergent from the Galaxy, normalized to the HVCs A and M with known distances, predicts distances from a few to 40 kpc, placing the faintest HVCs in the Galactic halo, too far away for a Galactic fountain. This model cannot explain the bright and spatially varying H-alpha in the Magellanic Stream, which requires another source of ionization. However, we do not find any HVCs super-faint in H-alpha; even with another ionization source, we conclude that the detected HVCs are not more than 2--4 times the distance of the MS (100-200 kpc). | | Source: | arXiv, astro-ph/0008263 | | Services: | Forum | Review | PDF | Favorites | |
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