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12 papers · 2 filters
Optical and X-ray monitoring of the NLS1 galaxy Ark 564
I. E. Papadakis, W. Brinkmann, H. Negoro +3
The Narrow-line Seyfert galaxy Ark 564 was monitored between June 04, 2000 and June 24, 2000 from Skinakas Observatory. The B,V,R and I band light curves show night to night variat…
The ASCA Catalog of Potential X-Ray Counterparts of GeV Sources
Mallory S. E. Roberts, Roger W. Romani, Nobuyuki Kawai
We present a catalog of 2-10 keV ASCA Gas Imaging Spectrometer images of fields containing bright sources of GeV emission. The images cover of the 95% confidence positio…
Pseudoparticle Multipole Method: A Simple Method to Implement High-Accuracy Treecode
Atsushi Kawai, Junichiro Makino
In this letter we describe the pseudoparticle multipole method (P2M2), a new method to express multipole expansion by a distribution of pseudoparticles. We can use this distributio…
Observation of X-ray lines from a Gamma-Ray Burst (GRB991216): Evidence of Moving Ejecta from the Progenitor
L. Piro, G. Garmire, M. Garcia +18
We report on the discovery of two emission features observed in the X-ray spectrum of the afterglow of the gamma-ray burst (GRB) of 16 Dec. 1999 by the Chandra X-Ray Observatory. T…
Discovery of a Luminous, Variable, Off-Center Source in the Nucleus of M82 with the Chandra HRC
H. Matsumoto, T. G. Tsuru, K. Koyama +8
We present results from observations of the most famous starburst galaxy M82 with the High-Resolution Camera onboard the Chandra X-Ray Observatory. We found nine sources in the cen…
ASCA Observations of the Jet Source XTE J1748-288
T. Kotani, N. Kawai, F. Nagase +6
XTE J1748-288 is a new X-ray transient with a one-sided radio jet. It was observed with ASCA on 1998/09/06 and 1998/09/26, 100 days after the onset of the radio-X-ray outburst. The…