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21 papers · 2 filters
A Puzzling Paucity of Double Peaked X-ray Pulsars
T. Bulik, D. Gondek-Rosi{ń}ska, A. Santangelo +3
Accretion powered pulsars exhibit a variety of lightcurves. In this paper we propose to classify the observed lightcurves as single or double pulsed.We analyze the lightcurves of 8…
A Chandra detection of diffuse hard X-ray emission associated with the lobes of the radio galaxy 3C 452
N. Isobe, M. Tashiro, K. Makishima +5
An 80 ksec Chandra ACIS observation of the radio galaxy 3C 452 is reported. A diffuse X-ray emission associated with the lobes has been detected with high statistical significance,…
The radiant of the Leonids meteor storm in 2001
Ken'ichi Torii, Mitsuhiro Kohama, Toshifumi Yanagisawa +1
We have measured the radiant of the Leonids meteor storm in November 2001 by using new observational and analysis techniques. The radiant was measured as the intersections of lines…
Long-term X-ray variability of quasars in the Lockman Hole field observed with ROSAT
Yu-ichiro Ezoe, Naoko Iyomoto, Kazuo Makishima +1
An improved method is utilized to estimate the X-ray power spectral densities (PSD) and the variation time scales of three quasars in the Lockman Hole field. Five archival ROSAT PS…
Upper limit on the mass of RX J1856.5--3754 as a possible quark star
Kazunori Kohri, Kei Iida, Katsuhiko Sato
Recent deep Chandra LETG+HRC-S observations suggest the possibility that RX J1856.5--3754 is a compact star whose radiation radius is 3.8--8.2 km. In this paper, we systematically…
Decomposition of the Superwind in M82
Youichi Ohyama, Yoshiaki Taniguchi, Masanori Iye +16
We present new optical images (, , and H) of the archetypical starburst/superwind galaxy M82 obtained with the 8.2 m Subaru Telescope to reveal new detailed structures of…