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15 papers · 2 filters
On the nature of the flares from three candidate tidal disruption events
Y. Lu, Z. Zheng, S. N. Zhang +1
The X-ray flares of NGC 5905, RX J1242.6-1119A, and RX J1624.9+7554 observed by Chandra in 2001 and 2002 have been suggested as the candidate tidal disruption events. The distinct…
Reconstruction of Hessence Dark Energy and the Latest Type Ia Supernovae Gold Dataset
Hao Wei, Ningning Tang, Shuang Nan Zhang
Recently, many efforts have been made to build dark energy models whose equation-of-state parameter can cross the so-called phantom divide . One of them is the so-called…
Cross-Correlation Detection of Point Sources in WMAP First Year Data
Jian Yin Nie, Shuang Nan Zhang
We apply a Cross-correlation (CC) method developed previously for detecting gamma-ray point sources to the WMAP first year data by using the Point-Spread Function of WMAP and obtai…
Gamma Ray Bursts: Complementarity to Other Cosmological Probes
Meng Su, Hong Li, Zuhui Fan +1
We combine recent long Gamma Ray Bursts (GRBs) sample including 52 objects out to z6.3 compiled from Swift Gamma Ray Bursts by Schaefer (2006) with Type Ia Supernova (SNIa), Cos…
Self-Similar Shocks in Polytropic Gas Flows around Star-Forming Regions
Yu-Qing Lou, Yang Gao
Self-similar shock solutions in spherically symmetric polytropic gas flows are constructed and analyzed in contexts of proto-star formation processes. Among other possible solution…
Comparison between Windowed FFT and Hilbert-Huang Transform for Analyzing Time Series with Poissonian Fluctuations: A Case Study
D. Han, S. N. Zhang
Hilbert-Huang Transform (HHT) is a novel data analysis technique for nonlinear and non-stationary data. We present a time-frequency analysis of both simulated light curves and an X…