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Diffuse stellar emission in X-ray luminous galaxy clusters at z ~ 0.3. I. Is the diffuse optical light boosted and rejuvenated in merging clusters?
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +4 more
Context: Clusters of galaxies host a diffuse population of intergalactic stars. Diffuse optical light is observed in clusters up to redshift z ∼ 0.4. Recent cosmological hydrodynamical simulations show that this intracluster light originates nearly in parallel with the build-up of the brightest cluster galaxy (BCG), as identified at z=0. However, …
Very Large Array Limits for Intermediate-Mass Black Holes in Three Globular Clusters
Gebhardt, K.; Goss, W. M.; Bash, F. N. +1 more
The observational evidence for central black holes in globular clusters has been argued extensively, and their existence has important consequences for both the formation and evolution of the cluster. Most of the evidence comes from dynamical arguments, but the interpretation is difficult, given the short relaxation times and old ages of the clust…
Cluster observations of electrostatic solitary waves near the Earth's bow shock
RèMe, H.; André, M.; Krasnoselskikh, V. +8 more
Using a period of internal burst mode data from the Cluster Electric Field and Wave instrument a number of electrostatic solitary structures have been identified in the foot region of Earth's quasi-perpendicular bow shock. The four individual probe potential measurements are utilized to investigate the fundamental characteristics of the solitary w…
Physical parameters along the boundaries of a mid-latitude streamer and in its adjacent regions
Susino, R.; Landi, E.; Spadaro, D. +2 more
Context: Coronal streamers appear to be strictly associated with the generation of the slow solar wind, even if a firm identification of the sources of the particle flux within these structures is still an unresolved issue.
Aims: The purpose of this work is to contribute to a better knowledge of the physical characteristics of streamers and of…
An Ultraluminous Supersoft X-Ray Source in M81: An Intermediate-Mass Black Hole?
Liu, Jifeng; Di Stefano, Rosanne
Ultraluminous supersoft X-ray sources (ULSSSs) exhibit supersoft spectra with blackbody temperatures of 50-100 eV and bolometric luminosities above 1039 ergs s-1 and are possibly intermediate-mass black holes (IMBHs) of >=103 M⊙ or massive white dwarfs that are progenitors of Type Ia supernovae. In th…
The Nature and Geometry of the Light Echo from SN 2006X
Crotts, Arlin P. S.; Yourdon, David
We report on the discovery of the geometry producing the light echo emanating from supernova 2006X, a nearby but underluminous Type Ia supernova (SN Ia) in M100 (=NGC 4321). This offers a rare chance to study the environment of a SN Ia. Contrary to previous reports, there is little evidence of a circumstellar component in the light echo morphology…
Photometric and spectral analysis of the distribution of crystalline and amorphous ices on Enceladus as seen by Cassini
Brown, R. H.; Buratti, B. J.; Jaumann, R. +3 more
Photometric and spectral analysis of data from the Cassini Visual and Infrared Mapping Spectrometer (VIMS) has yielded significant results regarding the properties and composition of the surface of Saturn's satellite Enceladus. We have obtained spectral cubes of this satellite, containing both spatial and spectral information, with a wavelength di…
The Recovery of CME-Related Dimmings and the ICME's Enduring Magnetic Connection to the Sun
Zhukov, A. N.; Mandrini, C. H.; van Driel-Gesztelyi, L. +5 more
It is generally accepted that transient coronal holes (TCHs, dimmings) correspond to the magnetic footpoints of CMEs that remain rooted in the Sun as the CME expands out into the interplanetary space. However, the observation that the average intensity of the 12 May 1997 dimmings recover to their pre-eruption intensity in SOHO/EIT data within 48 h…
Modeling X-Ray Loops and EUV "Moss" in an Active Region Core
Winebarger, Amy R.; Warren, Harry P.; Falconer, David A.
The soft X-ray intensity of loops in active region cores and the corresponding footpoint, or moss, intensity observed in the EUV remain steady for several hours of observation. The steadiness of the emission has prompted many to suggest that the heating in these loops must also be steady, although no direct comparison between the observed X-ray an…
Net circular polarization of sunspots in high spatial resolution
Kubo, M.; Lites, B. W.; Ichimoto, K. +8 more
Context: Net circular polarization (NCP) of spectral lines in sunspots has been most successfully explained by the presense of discontinuities in the magnetic field inclination and flow velocity along the line-of-sight in the geometry of the embedded flux tube model of penumbrae (Δγ-effect).
Aims: The fine scale structure of NCP in a sunspot i…