Search Publications
Giant Chromospheric Anemone Jet Observed with Hinode and Comparison with Magnetohydrodynamic Simulations: Evidence of Propagating Alfvén Waves and Magnetic Reconnection
Shibata, K.; Katsukawa, Y.; Okamoto, T. J. +4 more
Hinode discovered a beautiful giant jet with both cool and hot components at the solar limb on 2007 February 9. Simultaneous observations by the Hinode SOT, XRT, and TRACE 195 Å satellites revealed that hot (~5 × 106 K) and cool (~104 K) jets were located side by side and that the hot jet preceded the associated cool jet (~1-…
The Sloan Lens ACS Survey. VI. Discovery and Analysis of a Double Einstein Ring
Treu, Tommaso; Gavazzi, Raphaël; Marshall, Philip J. +4 more
We report the discovery of two concentric Einstein rings around the gravitational lens SDSS J0946+1006. The main lens is at redshift zl = 0.222, while the inner ring (1) is at redshift zs1 = 0.609 (REin 1 = 1.43'' +/- 0.01''). The wider image separation (REin 2 = 2.07''+/- 0.02'') of the outer ring (2) i…
Solar Surface Emerging Flux Regions: A Comparative Study of Radiative MHD Modeling and Hinode SOT Observations
Cheung, M. C. M.; Tarbell, T. D.; Title, A. M. +1 more
We present results from numerical modeling of emerging flux regions on the solar surface. The modeling was carried out by means of three-dimensional (3D) radiative MHD simulations of the rise of buoyant magnetic flux tubes through the convection zone and into the photosphere. Due to the strong stratification of the convection zone, the rise result…
Multiple Stellar Populations in Three Rich Large Magellanic Cloud Star Clusters
Mackey, A. D.; Ferguson, A. M. N.; Broby Nielsen, P. +1 more
We present deep color-magnitude diagrams for three rich intermediate-age star clusters in the LMC, constructed from archival ACS F435W and F814W imaging. All three clusters exhibit clear evidence for peculiar main-sequence turnoffs. NGC 1846 and 1806 each possess two distinct turnoff branches, while the turnoff for NGC 1783 shows a much larger spr…
The Current Sheet Associated with the 2003 November 4 Coronal Mass Ejection: Density, Temperature, Thickness, and Line Width
Raymond, J. C.; Ciaravella, A.
In the wake of the 2003 November 4 coronal mass ejection associated with the largest solar flare of the last sunspot cycle, a current sheet (CS) was observed by the Ultraviolet Coronagraph Spectrometer (UVCS) as a narrow bright feature in the [Fe XVIII] (106.8 K) line. This is the first UV observation in which the CS evolution is follow…
An Explanation for the Observed Weak Size Evolution of Disk Galaxies
Bell, Eric F.; Somerville, Rachel S.; Wisotzki, Lutz +14 more
Surveys of distant galaxies with the Hubble Space Telescope and from the ground have shown that there is only mild evolution in the relationship between radial size and stellar mass for galactic disks from z ~ 1 to the present day. Using a sample of nearby disk-dominated galaxies from the Sloan Digital Sky Survey (SDSS) and high-redshift data from…
Coronal Plasma Motions near Footpoints of Active Region Loops Revealed from Spectroscopic Observations with Hinode EIS
Harra, Louise K.; Doschek, George A.; Hara, Hirohisa +4 more
The solar active region 10938 has been observed from the disk center to the west limb with the Hinode EUV Imaging Spectrometer. In the disk-center observation, subsonic upflow motions of tens of km s-1 and enhanced nonthermal velocities have been found near the footpoints of the active region loops assuming a single Gaussian approximati…
Emergence of a Helical Flux Rope under an Active Region Prominence
Shibata, Kazunari; Tsuneta, Saku; Shimizu, Toshifumi +12 more
Continuous observations were obtained of NOAA AR 10953 with the Solar Optical Telescope (SOT) on board the Hinode satellite from 2007 April 28 to May 9. A prominence was located over the polarity inversion line (PIL) to the southeast of the main sunspot. These observations provided us with a time series of vector magnetic fields on the photosphere…
Cosmic Evolution of Black Holes and Spheroids. III. The MBH-σ* Relation in the Last Six Billion Years
Treu, Tommaso; Malkan, Matthew A.; Blandford, Roger D. +1 more
We measure the evolution of the correlation between black hole mass and host spheroid velocity dispersion (MBH-σ*) over the last 6 billion years, by studying three carefully selected samples of active galaxies at z = 0.57, z = 0.36 and z < 0.1. For all three samples, virial black hole masses are consistently estimated usin…
The Evolution of AGN Host Galaxies: From Blue to Red and the Influence of Large-Scale Structures
Popesso, P.; Lehmer, B. D.; Alexander, D. M. +14 more
We present an analysis of 109 moderate-luminosity (41.9 <= log L0.5-8.0 keV <= 43.7) AGNs in the Extended Chandra Deep Field-South survey, which is drawn from 5549 galaxies from the COMBO-17 and GEMS surveys having 0.4 <= z<= 1.1. These obscured or optically weak AGNs facilitate the study of their host galaxies since the AGN…