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Microlensing Event MOA-2007-BLG-400: Exhuming the Buried Signature of a Cool, Jovian-Mass Planet
Subo Dong, I. A. Bond, A. Gould +55
We report the detection of the cool, Jovian-mass planet MOA-2007-BLG-400Lb. The planet was detected in a high-magnification microlensing event (with peak magnification A_max = 628)…
Observation of Very High Energy Gamma Rays from HESS J1804-216 with CANGAROO-III Telescopes
Y. Higashi, H. Kubo, T. Yoshida +4
We observed the unidentified TeV gamma-ray source HESS J1804-216 with the CANGAROO-III atmospheric Cerenkov telescopes from May to July in 2006. We detected very high energy gamma…
OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?
Subo Dong, Andrew Gould, Andrzej Udalski +81
We combine all available information to constrain the nature of OGLE-2005-BLG-071Lb, the second planet discovered by microlensing and the first in a high-magnification event. These…
Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
J. -P. Beaulieu, D. P. Bennett, P. Fouque +46
In the favoured core-accretion model of formation of planetary systems, solid planetesimals accumulate to build up planetary cores, which then accrete nebular gas if they are suffi…
GEOTAIL observation of the SGR1806-20 Giant Flare: The first 600 ms
Toshio Terasawa, Yasuyuki Tanaka, Yasuhiro Takei +14
On December 27, 2004, plasma particle detectors on the GEOTAIL spacecraft detected an extremely strong signal of hard X-ray photons from the giant flare of SGR1806-20, a magnetar c…
Detection of Gamma-rays around 1TeV from RX J0852.0-4622 by CANGAROO-II
H. Katagiri, R. Enomoto, L. T. Ksenofontov +1
We have detected gamma-ray emission at the 6sigma level at energies greater than 500GeV from the supernova remnant RX J0852.0-4622 (G266.2-1.2) using the CANGAROO-II Imaging Atmosp…
Detection of Sub-TeV Gamma-Rays from the Galactic Center Direction by CANGAROO-II
K. Tsuchiya, R. Enomoto, L. T. Ksenofontov +3
We have detected sub-TeV gamma-ray emission from the direction of the Galactic Center (GC) using the CANGAROO-II Imaging Atmospheric Cherenkov Telescope (IACT). We detected a stati…
Observation of gamma-rays greater than 10 TeV from Markarian 421
K. Okumura, A. Asahara, G. V. Bicknell +42
We have observed Markarian 421 in January and March 2001 with the CANGAROO-II imaging Cherenkov telescope during an extraordinarily high state at TeV energies. From 14 hours observ…
The Nature of V359 Centauri Revealed: New Long-Period SU UMa-Type Dwarf Nova
T. Kato, R. Stubbings, P. Nelson +12
We detected four outbursts of V359 Cen (possible nova discovered in 1939) between 1999 and 2002. Time-resolved CCD photometry during two outbursts (1999 and 2002) revealed that V35…
Microlensing optical depth towards the Galactic bulge from MOA observations during 2000 with Difference Image Analysis
T. Sumi, F. Abe, I. A. Bond +27
We analyze the data of the gravitational microlensing survey carried out by by the MOA group during 2000 towards the Galactic Bulge (GB). Our observations are designed to detect ef…
The acceleration of cosmic-ray protons in the supernova remnant RX J1713.7-3946
II Collaboration, R. Enomoto
Protons with energies up to 10^15 eV are the main component[1] of cosmic rays, but evidence for the specific locations where they could have been accelerated to these energies has…
Power Spectra of X-ray Binaries
T. P. Li, Y. Muraki
The interpretation of Fourier spectra in the time domain is critically examined. Power density spectra defined and calculated in the time domain are compared with Fourier spectra i…
Study of variable stars in the MOA data base: long-period red variables in the Large Magellanic Cloud
S. Noda, M. Takeuti, F. Abe +31
One hundred and forty six long-period red variable stars in the Large Magellanic Cloud (LMC) from the three year MOA project database were analysed. A careful periodic analysis was…
Improving the Prospects for Detecting Extrasolar Planets in Gravitational Microlensing in 2002
I. A. Bond, F. Abe, R. J. Dodd +19
Gravitational microlensing events of high magnification have been shown to be promising targets for detecting extrasolar planets. However, only a few events of high magnification h…
Design Study of CANGAROO-III, Stereoscopic Imaging Atmospheric Cherenkov Telescopes for sub-TeV Gamma-ray
R. Enomoto, S. Hara, CANGAROO collaboration
CANGAROO-III is an Imaging Atmospheric Cherenkov Telescope (IACT) array of four 10 m telescopes for very high energy (sub-TeV) gamma-ray astronomy. A design study of the CANGAROO-I…
Study by MOA of extra-solar planets in gravitational microlensing events of high magnification
I. A. Bond, N. J. Rattenbury, J. Skuljan +27
A search for extra-solar planets was carried out in three gravitational microlensing events of high magnification, MACHO 98-BLG-35, MACHO 99-LMC-2, and OGLE 00-BUL-12. Photometry w…
Real-Time Difference Imaging Analysis of MOA Galactic Bulge Observations During 2000
I. A. Bond, F. Abe, R. J. Dodd +27
We describe observations carried out by the MOA group of the Galactic Bulge during 2000 that were designed to detect efficiently gravitational microlensing of faint stars in which…
Status of the CANGAROO-III Project
Masaki Mori
The CANGAROO-III project, a system of four 10 m telecopes dedicated for gamma-ray astrophysics, has started in 1999 and is expected to complete in 2004 in Woomera, South Australia.…
Observations of the supernova remnant W28 at TeV energies
G. P. Rowell, T. Naito, S. A. Dazeley +24
The atmospheric Cerenkov imaging technique has been used to search for point-like and diffuse TeV gamma-ray emission from the southern supernova remnant, W28, and surrounding regio…
Discovery of the optical counterpart and early optical observations of GRB990712
Kailash C. Sahu
We present the discovery observations of the optical counterpart of the gamma-ray burster GRB990712 taken 4.16 hours after the outburst and discuss its light curve observed in the…
Very High-Energy Gamma-Ray Observations of PSR B1509-58 with the CANGAROO 3.8m Telescope
T. Sako, Y. Matsubara, Y. Muraki +31
The gamma-ray pulsar PSR B1509-58 and its surrounding nebulae have been observed with the CANGAROO 3.8m imaging atmospheric Cherenkov telescope. The observations were performed fro…
The Cangaroo-III Project
Masaki Mori, S. A. Dazeley, P. G. Edwards +28
The CANGAROO-III project,which consists of an array of four 10 m imaging Cherenkov telescopes,has just started being constructed in Woomera, South Australia,in a collaboration betw…
The SNR W28 at TeV Energies
G. P. Rowell, T. Naito, S. A. Dazeley +24
The southern supernova remnant (SNR)W28 was observed in 1994 and 1995 by the CANGAROO 3.8m telescope in a search formulti-TeV gamma ray emission, using the Cerenkov imaging techniq…
Initial Performance of CANGAROO-II 7m telescope
Hidetoshi Kubo, S. A. Dazeley, P. G. Edwards +28
CANGAROO group constructed an imaging air Cherenkov telescope (CANGAROO-II) in March 1999 atWoomera, South Australia to observe celestial gamma-rays in hundreds GeV region. It has…