Search Publications
Spectroscopic Observations of a Coronal Moreton Wave
Veronig, Astrid; Harra, Louise K.; Sterling, Alphonse C. +1 more
We observed a coronal wave (EIT wave) on 2011 February 16, using EUV imaging data from the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA) and EUV spectral data from the Hinode/EUV Imaging Spectrometer (EIS). The wave accompanied an M1.6 flare that produced a surge and a coronal mass ejection (CME). EIS data of the wave show a promin…
Hubble Space Telescope Imaging of Post-starburst Quasars
Canalizo, G.; Shang, Zhaohui; Brotherton, M. S. +7 more
We present images of 29 post-starburst quasars (PSQs) from a Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Wide Field Channel Snapshot program. These broadlined active galactic nuclei (AGNs) possess the spectral signatures of massive (M burst ~ 1010 M sun), moderate-aged stellar populations (hundre…
COS Observations of Metal Line and Broad Lyman-α Absorption in the Multi-phase O VI and Ne VIII System at z = 0.20701 toward HE 0226-4110
Savage, B. D.; Narayanan, A.; Lehner, N.
Observations of the QSO HE 0226-4110 (z em = 0.495) with the Cosmic Origins Spectrograph (COS) from 1134 to 1796 Å with a resolution of ~17 km s-1 and signal-to-noise ratio (S/N) per resolution element of 20-40 are used to study the multi-phase absorption system at z = 0.20701 containing O VI and Ne VIII. The system was previ…
Early-type Galaxies at z ~ 1.3. III. On the Dependence of Formation Epochs and Star Formation Histories on Stellar Mass and Environment
Ford, H. C.; Demarco, R.; Treu, T. +20 more
We study the environmental dependence of stellar population properties at z ~ 1.3. We derive galaxy properties (stellar masses, ages, and star formation histories) for samples of massive, red, passive early-type galaxies (ETGs) in two high-redshift clusters, RXJ0849+4452 and RXJ0848+4453 (with redshifts of z = 1.26 and 1.27, respectively), and com…
The Mass-Lx Relation for Moderate Luminosity X-ray Clusters
McNamara, Brian R.; Donahue, Megan; Voit, G. Mark +2 more
We present measurements of the masses of a sample of 25 moderate X-ray luminosity clusters of galaxies from the 160 square degree ROSAT survey. The masses were obtained from a weak-lensing analysis of deep F814W images obtained using the Advanced Camera for Surveys. We present an accurate empirical correction for the effect of charge transfer (in)…
Hubble Space Telescope Imaging of Lyα Emission at z ≈ 4.4
Finkelstein, Steven L.; Grogin, Norman A.; Hathi, Nimish P. +28 more
We present the highest redshift detections of resolved Lyα emission, using Hubble Space Telescope (HST)/Advanced Camera for Surveys F658N narrowband-imaging data taken in parallel with the Wide Field Camera 3 Early Release Science program in the GOODS Chandra Deep Field-South. We detect Lyα emission from three spectroscopically confirmed z = 4.4 L…
Different Patterns of Chromospheric Evaporation in a Flaring Region Observed with Hinode/EIS
Ding, M. D.; Li, Y.
We investigate the chromospheric evaporation in the flare of 2007 January 16 using line profiles observed by the Exterme-UV Imaging Spectrometer on board Hinode. Three points at flare ribbons of different magnetic polarities are analyzed in detail. We find that the three points show different patterns of upflows and downflows in the impulsive phas…
The Solar Energetic Balance Revisited by Young Solar Analogs, Helioseismology, and Neutrinos
Turck-Chièze, Sylvaine; Couvidat, Sébastien; Piau, Laurent
The energetic balance of the standard solar model (SSM) results from equilibrium between nuclear energy production, energy transfer, and photospheric emission. In this Letter, we give an order of magnitude of several percent for the loss of energy in kinetic energy, magnetic energy, and X-ray or UV radiation during the entire solar lifetime from t…
Sympathetic Filament Eruptions Connected by Coronal Dimmings
Yang, Jiayan; Bi, Yi; Hong, Junchao +2 more
We present for the first time detailed observations of three successive, interdependent filament eruptions that occurred one by one within 5 hr from different locations beyond the range of a single active region. The first eruption was observed from an active region and was associated with a coronal mass ejection (CME), during which diffuse and co…
Galaxy Clusters at High Redshift and Evolution of Brightest Cluster Galaxies
Han, J. L.; Wen, Z. L.
Identification of high-redshift clusters is important for studies of cosmology and cluster evolution. Using photometric redshifts of galaxies, we identify 631 clusters from the Canada-France-Hawaii Telescope (CFHT) wide field, 202 clusters from the CFHT deep field, 187 clusters from the Cosmic Evolution Survey (COSMOS) field, and 737 clusters from…