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astro-ph2007★ 35 cited
Determination of the Physical Conditions of the Knots in the Helix Nebula from Optical and Infrared Observations
C. R. O'Dell, W. J. Henney, G. J. Ferland
[Abridged] We use new HST and archived images to clarify the nature of the knots in the Helix Nebula. We employ published far infrared spectrophotometry and existing 2.12 micron im…
astro-ph1999
The PG X-ray QSO sample: Links between the UV-X-ray Continuum and Emission Lines
Beverley J. Wills, M. S. Brotherton, A. Laor +4
The UV to soft X-rays of luminous AGNs dominate their bolometric luminosity, driven by an accretion-powered dynamo at the center. These photons ionize the surrounding gas, thereby…