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23 papers · 2 filters
Probing the hard X-ray properties of high-redshift Radio-Quiet Quasars with ASCA
C. Vignali, A. Comastri, M. Cappi +3
This paper reports the X-ray spectral analysis of 5 high-redshift (z \ge 2) radio-quiet quasars observed by ASCA. A simple power law continuum plus cold Galactic absorption model w…
ASCA Discovery of an X-ray Pulsar in the Error Box of SGR1900+14
K. Hurley, P. Li, C. Kouveliotou +9
We present a 2 - 10 keV ASCA observation of the field around the soft gamma repeater SGR1900+14. One quiescent X-ray source was detected in this observation, and it was in the SGR…
TeV gamma-ray observations of southern BL Lacs with the CANGAROO 3.8m Imaging Telescope
M. D. Roberts, S. A. Dazeley, P. G. Edwards +32
Observational and theoretical results indicate that low-redshift BL Lacertae objects are the most likely extragalactic sources to be detectable at TeV energies. In this paper we pr…
A Study of High Energy Emission from the TeV blazar Mrk 501 during Multiwavelength Observations in 1996
J. Kataoka, J. R. Mattox, J. Quinn +8
We present the results of a multiwavelength campaign for Mrk 501 performed in March 1996 with ASCA, EGRET, Whipple, and optical telescopes. In the X-ray band, a spectral break was…
Detection of Iron Emission Line from the Galaxy Cluster Including the Distant Radio Galaxy 3C220.1
Naomi Ota, Kazuhisa Mitsuda, Makoto Hattori +1
We detected an emission line feature at 4 keV in the X-ray spectrum of a sky region including the distant radio galaxy 3C220.1(z=0.62) obtained with ASCA. The line energy is 6.1 -…
A Large-scale CO Imaging of the Galactic Center. II. Dynamical Properties of Molecular Clouds
T. Oka, T. Hasegawa, F. Sato +2
The data from the Nobeyama Radio Observatory 45 m telescope Galactic Center CO survey have been analyzed to generate a compilation of molecular clouds with intense CO emission in t…