Pian, Elena, Campana, Sergio, Chincarini, Guido, Corcoran, Michael F., Hamaguchi, Kenji, Gull, Theodore, ...
We observed the massive binary stellar system of Eta Carinae in the 0.3-10 keV energy range with the X-ray Telescope onboard the Swift satellite during the period 15 December 2008 - 11 March 2009,...
Super-hard X-Ray Emission from eta Carinae Observed with Suzaku (2009)
Sekiguchi, Akiko, Tsujimoto, Masahiro, Kitamoto, Shunji, Ishida, Manabu, Hamaguchi, Kenji, Mori, Hideyuki, ...
We present the Suzaku results of eta Carinae in the 5--50 keV range conducted twice around the apastron in 2005 August for 50 ks and in 2006 February for 20 ks. The X-ray Imaging Spectrometer (XIS)...
A Smoking Gun in the Carina Nebula (2009)
Hamaguchi, Kenji, Corcoran, Michael F., Ezoe, Yuichiro, Townsley, Leisa, Broos, Patrick, Gruendl, Robert, ...
The Carina Nebula is one of the youngest, most active sites of massive star formation in our Galaxy. In this nebula, we have discovered a bright X-ray source that has persisted for ~30 years. The...
Centimeter Polarimetry of the R Coronae Australis Region (2008)
Choi, Minho, Tatematsu, Ken'ichi, Hamaguchi, Kenji, Lee, Jeong-Eun
Circularly polarized 3.5 cm continuum emission was detected toward three radio sources in the R CrA region using the Very Large Array. The Class I protostar IRS 5b persistently showed polarized radio...
The Suzaku Observations of SS Cygni in Quiescence and Outburst (2008)
Ishida, Manabu, Okada, Shunsaku, Hayashi, Takayuki, Nakamura, Ryoko, Terada, Yukikatsu, Mukai, Koji, ...
We present results from the Suzaku observations of the dwarf nova SS Cyg in quiescence and outburst in 2005 November. Owing to high sensitivity of the HXD PIN detector and high spectral resolution of...
Ezoe, Yuichiro, Hamaguchi, Kenji, Gruendl, Robert A., Chu, You-Hua, Petre, Robert, Corcoran, Michael F.
The eastern tip region of the Carina Nebula was observed with the Suzaku XIS for 77 ks to conduct a high-precision spectral study of extended X-ray emission. XMM-Newton EPIC data of this region were...
Centimeter Imaging of the R Coronae Australis Region (2008)
Choi, Minho, Hamaguchi, Kenji, Lee, Jeong-Eun, Tatematsu, Ken'ichi
The R CrA region was observed in the 3.5 and 6.2 cm continuum with high angular resolutions (0.6--1.7 arcseconds) using the Very Large Array. Archival data sets were also analyzed for comparison,...
Resolving a Class I Protostar Binary System with Chandra (2008)
Hamaguchi, Kenji, Choi, Minho, Corcoran, Michael F., Choi, Chul-Sung, Tatematsu, Ken'ichi, Petre, Rob
Using a sub-pixel event repositioning technique, we spatially resolved X-ray emission from the infrared double system IRS 5 in the R Corona Australis molecular cloud with ~0.8" separation. As far as...
Suzaku Spectroscopy of the Extended X-Ray Emission in M17 (2007)
Hyodo, Yoshiaki, Tsujimoto, Masahiro, Hamaguchi, Kenji, Koyama, Katsuji, Kitamoto, Shunji, Maeda, Yoshitomo, ...
We present the results of a Suzaku spectroscopic study of the soft extended X-ray emission in the HII region M17. The spectrum of the extended emission was obtained with a high signal-to-noise ratio...
Diffuse X-ray Emission from the Carina Nebula Observed with Suzaku (2007)
A number of giant HII regions are associated with soft diffuse X-ray emission. Among these, the Carina nebula possesses the brightest soft diffuse emission. The required plasma temperature and...
X-ray Spectral Variation of Eta Carinae through the 2003 X-ray Minimum (2007)
Hamaguchi, Kenji, Corcoran, Michael F., Gull, Theodore, Ishibashi, Kazunori, Pittard, Julian M., Hillier, D. John, ...
We report the results of an X-ray observing campaign on the massive, evolved star Eta Carinae, concentrating on the 2003 X-ray minimum as seen by the XMM-Newton observatory. These are the first...
The X-ray observatory Suzaku (2007)
Mitsuda, Kazuhisa, Bautz, Mark, Inoue, Hajime, Kelley, Richard L., Koyama, Katsuji, Kunieda, Hideyo, ...
Eta Car and Its Surroundings: the X-ray Diagnosis (2007)
Kenji Hamaguchi, M. F. Corcoran
X-ray emission from the supermassive star Eta Carinae ( Carinae) originates from hot shocked gas produced by current stellar mass loss as well as ejecta from prior eruptive events. Absorption of this...
Suzaku Observation of Diffuse X-ray Emission from the Carina Nebula (2006)
Hamaguchi, Kenji, Petre, Robert, Matsumoto, Hironori, Tsujimoto, Masahiro, Holt, Stephan S., Ezoe, Yuichiro, ...
We studied extended X-ray emission from the Carina Nebula taken with the Suzaku CCD camera XIS on 2005 Aug. 29. The X-ray morphology, plasma temperature and absorption to the plasma are consistent...
Suzaku Observations of the Local and Distant Hot ISM (2006)
Smith, Randall K., Bautz, Mark W., Edgar, Richard J., Hamaguchi, Kenji, Hughes, John P., Ishida, Manabu, ...
Suzaku observed the molecular cloud MBM12 and a blank field less than 3 degrees away to separate the local and distant components of the diffuse soft X-ray background. Towards MBM12, a local (D< 275...
V1647 Ori: The X-ray evolution of a Pre-main Sequence Accretion Burst (2006)
Kastner, Joel, Richmond, Michael, Grosso, Nicolas, Weintraub, David, Simon, Theodore, Henden, Arne, ...
Also archived in: arXiv:astro-ph/0607653 v1 Jul 28 2006
Grosso, Nicolas, Kastner, Joel, Ozawa, Hideki, Richmond, Michael, Simon, Theodore, Weintraub, David, ...
Also archived in: arXiv: astro-ph/0504111 v1 5 Apr 2005
Grosso, Nicolas, Kastner, Joel, Ozawa, Hideki, Richmond, Michael, Simon, Theodore, Weintraub, David, ...
Also archived in: arXiv: astro-ph/0504111 v1 5 Apr 2005
Discovery of Extremely Embedded X-ray Sources in the R Coronae Australis Star Forming Core (2005)
Hamaguchi, Kenji, Corcoran, Michael F., Petre, Rob, White, Nicholas E., Stelzer, Beate, Nedachi, Ko, ...
With the XMM-Newton and Chandra observatories, we detected two extremely embedded X-ray sources in the R Corona Australis (R CrA) star forming core, near IRS 7. These sources, designated as XB and...
An X-ray outburst from the rapidly accreting young star that illuminates McNeil's Nebula (2004)
Kastner, Joel, Richmond, Michael, Gross, Nicolas, Weintraub, David, Simon, Theodore, Frank, Adam, ...
Also archived in: arXiv: astro-ph/0408332
An X-ray outburst from the rapidly accreting young star that illuminates McNeil's Nebula (2004)
Kastner, Joel, Richmond, Michael, Grosso, Nicolas, Weintraub, David, Simon, Theodore, Frank, Adam, ...
Also archived in: arXiv: astro-ph/0408332
X-ray Study of the Intermediate-Mass Young Stars Herbig Ae/Be Stars (2004)
Hamaguchi, Kenji, Yamauchi, Shigeo, Koyama, Katsuji
We present the ASCA results of intermediate-mass pre-main-sequence stars (PMSs), or Herbig Ae/Be stars (HAeBes). Among the 35 ASCA pointed-sources, we detect 11 plausible X-ray counterparts. X-ray...
Chandra Observations of a Young Embedded Magnetic B Star in the rho Ophiuchus Cloud (2003)
Hamaguchi, Kenji, Corcoran, Michael F., Imanishi, Kensuke
This paper reports on an analysis of two Chandra X-ray observations of the young magnetic B star rho Ophiuchus S1. X-ray emission from the star was detected in both observations. The average flux was...
X-ray study of the intermediate mass young stars Herbig Ae/Be stars / (2002)
Thesis (doctoral)--Kyoto University, 2001.
Discovery of X rays from Class 0 protostar candidates in OMC-3 (2001)
Tsuboi, Yohko, Koyama, Katsuji, Hamaguchi, Kenji, Tatematsu, Ken'ichi, Sekimoto, Yutaro, Bally, John, ...
We have observed the Orion Molecular Clouds 2 and 3 (OMC-2 and OMC-3) with the Chandra X-ray Observatory (CXO). The northern part of OMC-3 is found to be particularly rich in new X-ray features; four...