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- Goddard Space Flight CenterUS501 papers
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8 papers · 2 filters
A Chandra Survey of the X-ray Properties of Broad Absorption Line Radio-Loud Quasars
B. P. Miller, W. N. Brandt, R. R. Gibson +2
This work presents the results of a Chandra study of 21 broad absorption line (BAL) radio-loud quasars (RLQs). We conducted a Chandra snapshot survey of 12 bright BAL RLQs selected…
Emergence of a Broad-Absorption-Line Outflow in the Narrow-line Seyfert 1 Galaxy WPVS 007
Karen M. Leighly, Fred Hamann, Darrin A. Casebeer +1
We report results from a 2003 FUSE observation, and reanalysis of a 1996 HST observation of the unusual X-ray transient Narrow-line Seyfert 1 galaxy WPVS 007. The HST FOS spectrum…
Ultraviolet Spectroscopy of Supernovae: The First Two Years of Swift Observations
F. Bufano, S. Immler, M. Turatto +13
We present the entire sample of ultraviolet (UV) spectra of supernovae (SNe) obtained with the Ultraviolet/Optical Telescope (UVOT) on board the Swift satellite during the first 2…
PHL 1092 as a transient extreme X-ray weak quasar
G. Miniutti, A. C. Fabian, W. N. Brandt +2
We report a dramatic variability event in the X-ray history of the Narrow-Line quasar PHL 1092 (z=0.396). Our latest 2008 XMM-Newton observation reveals a flux drop of ~200 with re…
Bounds on Black Hole Spins
Ruth A. Daly
Beam powers and black hole masses of 48 extended radio sources are combined to obtain lower bounds on the spins and magnetic field strengths of supermassive black holes. This is do…
Kinematic Evidence for Halo Substructure in Spiral Galaxies
Kimberly A. Herrmann, Robin Ciardullo, Steinn Sigurdsson
We present the results of a kinematic study of planetary nebulae in the extreme outskirts of two spiral galaxies, M83 (NGC 5236) and M94 (NGC 4736). We find that in the inner regio…