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36 papers · 1 filter
Discovery of a Be/X-ray Binary Consistent with the Position of GRO J2058+42
Colleen A. Wilson, Martin C. Weisskopf, Mark H. Finger +4
GRO J2058+42 is a 195 s transient X-ray pulsar discovered in 1995 with BATSE. In 1996, RXTE located GRO J2058+42 to a 90% confidence error circle with a 4' radius. On 20 February 2…
Dilaton Black Holes in de Sitter or Anti-de Sitter Universe
Chang Jun Gao, Shuang Nan Zhang
Poletti and Wiltshire have shown that, with the exception of a pure cosmological constant, the solution of a dilaton black hole in the background of de Sitter or anti-de Sitter uni…
A Single Intrinsic Luminosity Function for Both Type-I and Type-II Active Galactic Nuclei
Shuang Nan Zhang
The luminous electromagnetic emission from distant active galactic nuclei (AGNs) including quasars is believed to be powered by accretion onto super-massive black holes (SMBHs). In…
An Off-Axis Model for GRB 031203
Enrico Ramirez-Ruiz, Jonathan Granot, Chryssa Kouveliotou +3
The low luminosity radio emission of the unusually faint GRB 031203 has been argued to support the idea of a class of intrinsically sub-energetic gamma-ray bursts (GRBs), currently…
The broad-band spectrum of the persistent emission from SGR1806-20
S. Molkov, K. Hurley, R. Sunyaev +2
We present the results of an analysis of the quiescent X-ray emission from the Soft Gamma-Ray Repeater SGR1806-20, taken during an INTEGRAL ultra-deep survey of the Galactic Center…
Higher Dimensional Dilaton Black Holes with Cosmological Constant
Chang Jun Gao, Shuang Nan Zhang
The metric of a higher-dimensional dilaton black hole in the presence of a cosmological constant is constructed. It is found that the cosmological constant is coupled to the dilato…