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A broad-line quasar with unexplained extreme velocity offsets: post-shock outflow?
V. Rusakov, C. L. Steinhardt, M. Schramm +4
The quasar SDSS 0956+5128 exhibits three distinct velocity components with large offsets in emission: the systemic velocity of [O II], [O III] and [Ne III] narrow lines have redshi…
Classification of BATSE, Swift, and Fermi Gamma-Ray Bursts from Prompt Emission Alone
Charles L. Steinhardt, William J. Mann, Vadim Rusakov +1
Although it is generally assumed that there are two dominant classes of gamma-ray bursts (GRB) with different typical durations, it has been difficult to unambiguously classify GRB…
A more probable explanation for a continuum flash in the direction of a redshift 11 galaxy
Charles L. Steinhardt, Michael I. Andersen, Gabriel B. Brammer +5
Recent work reported the discovery of a gamma-ray burst (GRB) associated with the galaxy GN-z11 at . The extreme improbability of the transient source being a GRB in the…
An Unambiguous Separation of Gamma-Ray Bursts into Two Classes from Prompt Emission Alone
Christian K. Jespersen, Johann B. Severin, Charles L. Steinhardt +4
The duration of a gamma-ray burst (GRB) is a key indicator of its physics origin, with long bursts perhaps associated with the collapse of massive stars and short bursts with merge…
A statistical relation between the X-ray spectral index and Eddington ratio of active galactic nuclei in deep surveys
M. Brightman, J. D. Silverman, V. Mainieri +33
We present an investigation into how well the properties of the accretion flow onto a supermassive black hole may be coupled to those of the overlying hot corona. To do so, we spec…
SDSS 0956+5128: A Broad-line Quasar with Extreme Velocity Offsets
Charles L. Steinhardt, Malte Schramm, John D. Silverman +8
We report on the discovery of a Type 1 quasar, SDSS 0956+5128, with a surprising combination of extreme velocity offsets. SDSS 0956+5128 is a broad-lined quasar exhibiting emission…