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67 papers · 2 filters
Intensive HST, RXTE and ASCA Monitoring of NGC 3516: Evidence Against Thermal Reprocessing
Rick Edelson, Anuradha Koratkar, Kirpal Nandra +10
During 1998 April 13-16, NGC 3516 was monitored almost continuously with HST for 10.3 hr in the UV and 2.8 d in the optical, and simultaneous RXTE and ASCA monitoring covered the s…
No nearby counterparts to the moving objects in the Hubble Deep Field
Chris Flynn, J. Sommer-Larsen, B. Fuchs +3
Ibata et al (1999) have recently discovered faint, moving objects in the Hubble Deep Field. The quantity, magnitudes and proper motions of these objects are consistent with old whi…
On effects of resolution in dissipationless cosmological simulations
Alexander Knebe, Andrey V. Kravtsov, Stefan Gottloeber +1
We present a study of numerical effects in dissipationless cosmological simulations. The numerical effects are evaluated and studied by comparing results of a series of 64^3-partic…
A High Signal-to-Noise UV Spectrum of NGC 7469: New Support for Reprocessing of Continuum Radiation
Gerard A. Kriss, Bradley M. Peterson, D. Michael Crenshaw +1
From 1996 June 10 to 1996 July 29 the International AGN Watch monitored the Seyfert 1 galaxy NGC 7469 using IUE, RXTE, and a network of ground-based observatories. On 1996 June 18,…
Binary Black Hole Mergers from Planet-like Migrations
Andrew Gould, Hans-Walter Rix
If supermassive black holes (BHs) are generically present in galaxy centers, and if galaxies are built up through hierarchical merging, BH binaries are at least temporary features…
The Supernova Relic Neutrino Background
M. Kaplinghat, G. Steigman, T. P. Walker
An upper bound to the supernova relic neutrino background from all past Type II supernovae is obtained using observations of the Universal metal enrichment history. We show that an…