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17 papers · 2 filters
A minor body falling onto a neutron star as an explanation for the unusual gamma-ray burst GRB 101225A
S. Campana, G. Lodato, P. D'Avanzo +17
The tidal disruption of a solar mass star around a supermassive black hole has been extensively studied analytically and numerically. In these events the star develops into an elon…
Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space Telescope
Xiaofeng Wang, Lifan Wang, Alexei V. Filippenko +93
We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Sur…
Three Dimensional MHD Simulation of Circumbinary Accretion Disks: Disk Structures and Angular Momentum Transport
Ji-Ming Shi, Julian H. Krolik, Stephen H. Lubow +1
We present the first three-dimensional magnetohydrodynamic (MHD) simulations of a circumbinary disk surrounding an equal mass binary. The binary maintains a fixed circular orbit of…
The Structure of the M87 Jet: A Transition from Parabolic to Conical Streamlines
Keiichi Asada, Masanori Nakamura
The structure of the M87 jet, from milli-arcsec to arcsecond scales, is extensively investigated, utilizing the images taken with the EVN, MERLIN and VLBA. We discover that the jet…
Optical Polarization and Spectral Variability in the M87 Jet
Eric S. Perlman, Steven C. Adams, Mihai Cara +10
During the last decade, M87's jet has been the site of an extraordinary variability event, with one knot (HST-1) increasing by over a factor 100 in brightness. Variability was also…
Swift J2058.4+0516: Discovery of a Possible Second Relativistic Tidal Disruption Flare?
S. Bradley Cenko, Hans A. Krimm, Assaf Horesh +18
We report the discovery by the Swift hard X-ray monitor of the transient source Swift J2058.4+0516 (Sw J2058+05). Our multi-wavelength follow-up campaign uncovered a long-lived (du…