Search Publications
Chandra Detections of Diffuse X-Ray Emission from Globular Clusters
Kokubun, Motohide; Makishima, Kazuo; Yuasa, Takayuki +1 more
Using Chandra, extended X-ray emission was detected from the direction of 6 globular clusters: 47 Tucanae, NGC 6752, M 5, ω Centauri, M 80, and NGC 6266. These X-ray sources, extending to a few arcmin, are located 1'--6' away from the cluster centers, and some are found in the direction of cluster motion through the Galactic halo. All of these sou…
AKARI Infrared Imaging of Reflection Nebulae IC4954 and IC4955
Ohyama, Y.; Takagi, T.; Matsuhara, H. +26 more
We present the observations of the reflection nebulae IC4954 and IC4955 region with the Infrared Camera and the Far-Infrared Surveyor (FIS) on board the infrared astronomical satellite AKARI during its performance verification phase. We obtained 7 band images from 7 to 1601° around the IC4954/4955 region was created from the AKARI mid-infrared All…
Observations of Transient Active Region Heating with Hinode
Warren, Harry P.; Hara, Hirohisa; Ugarte-Urra, Ignacio +3 more
We present observations of transient active region heating events observed with the Extreme Ultraviolet Imaging Spectrometer (EIS) and X-ray Telescope (XRT) on Hinode. This initial investigation focuses on NOAA active region 10940 as observed by Hinode on 2007 February 1 between 12 and 19UT. In these observations we find numerous examples of trans…
Search for Oxygen Emission from Warm-Hot Intergalactic Medium around A2218 with Suzaku
Kelley, Richard L.; Hughes, John P.; Ohashi, Takaya +12 more
We searched for redshifted O emission lines from a possible warm-hot intergalactic medium (WHIM) surrounding the cluster of galaxies A2218 at z=0.1756 using the X-ray Imaging Spectrometer (XIS) instrument on Suzaku. This cluster is thought to have an elongated structure along the line of sight based on previous studies. We studied systematic uncer…
Hinode EUV Imaging Spectrometer Observations of Solar Active Region Dynamics
Warren, Harry P.; Hara, Hirohisa; Ugarte-Urra, Ignacio +3 more
The EUV Imaging Spectrometer (EIS) on the Hinode satellite is capable of measuring emission line center positions for Gaussian line profiles to a fraction of a spectral pixel, resulting in relative solar Doppler-shift measurements with an accuracy of a less than a km s-1 for strong lines. We show an example of the application of that ca…
The Structure and Dynamics of the Quiet Corona from Observations with the Extreme Ultraviolet Imaging Spectrometer on Hinode
Harra, Louise K.; Doschek, George A.; Hansteen, Viggo H. +4 more
The goal of the Hinode mission is to provide an observational basis for understanding the heating and acceleration of coronal plasmas. On 2007 January 20, the Extreme ultraviolet Imaging Spectrometer performed a raster of a quiet region near Sun center. Maps of intensities, velocities, and electron densities derived from these observations are pre…
The Temperature and Density Structure of an Active Region Observed with the Extreme-Ultraviolet Imaging Spectrometer on Hinode
Warren, Harry P.; Doschek, George A.; Young, Peter R. +5 more
The Extreme-Ultraviolet Imaging Spectrometer (EIS) on Hinode produces high resolution spectra that can be combined via rasters into monochromatic images of solar structures, such as active regions. Electron temperature and density maps of the structures can be obtained by imaging the structures in different spectral lines with ratios sensitive to …
On Connecting the Dynamics of the Chromosphere and Transition Region with Hinode SOT and EIS
Harra, Louise K.; Warren, Harry P.; Hara, Hirohisa +14 more
We use coordinated Hinode SOT/EIS observations that include high-resolution magnetograms, chromospheric, and transition region (TR) imaging, and TR/coronal spectra in a first test to study how the dynamics of the TR are driven by the highly dynamic photospheric magnetic fields and the ubiquitous chromospheric waves. Initial analysis shows that the…
Spatial Distributions of Cold and Warm Interstellar Dust in M101 Resolved with AKARI/Far-Infrared Surveyor (FIS)
Nakagawa, T.; Okada, Y.; Kaneda, H. +2 more
The nearby face-on spiral galaxy M101 has been observed with the Far-Infrared Surveyor onboard AKARI. The far-infrared four-band images reveal fine spatial structures of M101, which include global spiral patterns, giant HII regions embedded in outer spiral arms, and a bar-like feature crossing the center. The spectral energy distribution of the wh…
Formation of Moving Magnetic Features and Penumbral Magnetic Fields with Hinode/SOT
Tsuneta, Saku; Shimizu, Toshifumi; Kubo, Masahito +10 more
Vector magnetic fields of moving magnetic features (MMFs) were well observed with the Solar Optical Telescope (SOT) aboard the Hinode satellite. We focused on the evolution of three MMFs with the SOT in this study. We found that an MMF having relatively vertical fields with the same polarity as the sunspot was detached from the penumbra around the…