Search Publications
An XMM-Newton study of the environments, particle content and impact of low-power radio galaxies
Hardcastle, M. J.; Croston, J. H.; Birkinshaw, M. +2 more
We present a detailed study of the environments of a sample of nine low-power [Fanaroff-Riley type I (FRI)] radio galaxies, based on new and archival XMM-Newton observations. We report new detections of group-scale environments around three radio galaxies: 3C296, NGC1044 and 3C76.1. As with previous studies, we find that FRI radio galaxies inhabit…
Combining Lens Distortion and Depletion to Map the Mass Distribution of A1689
Broadhurst, Tom; Umetsu, Keiichi
We derive a projected 2D mass map of the well-studied galaxy cluster A1689 based on an entropy-regularized maximum likelihood combination of the lens magnification and distortion of red background galaxies registered in deep Subaru images. The method is not restricted to the weak regime but applies to the whole area outside the tangential critical…
Properties of magnetosheath mirror modes observed by Cluster and their response to changes in plasma parameters
Dandouras, Iannis; Lucek, Elizabeth; Soucek, Jan
Mirror modes are large amplitude nonpropagating compressive structures frequently observed in the magnetosheath. They appear in the form of quasi-sinusoidal oscillations in the magnetic field, profound magnetic decreases (dips) or magnetic enhancements (peaks), accompanied by a corresponding anticorrelated signature in plasma density. In this stud…
Revised Bolometric Corrections and Interstellar Extinction Coefficients for the ACS and WFPC2 Photometric Systems
Girardi, Léo; Seth, Anil C.; Holtzman, Jon A. +9 more
We present extensive tables of bolometric corrections and interstellar extinction coefficients for the WFPC2 and ACS (both WFC and HRC) photometric systems. They are derived from synthetic photometry applied to a database of spectral energy distributions covering a large range of effective temperatures, surface gravity, and metal content. Carbon s…
The Relation between Star Formation, Morphology, and Local Density in High-Redshift Clusters and Groups
Aragón-Salamanca, Alfonso; Milvang-Jensen, Bo; Zaritsky, Dennis +17 more
We investigate how the [O II] properties and the morphologies of galaxies in clusters and groups at z = 0.4-0.8 depend on projected local galaxy density, and compare with the field at similar redshifts and clusters at low z. In both nearby and distant clusters, higher density regions contain proportionally fewer star-forming galaxies, and the aver…
Observations and Modeling of the Early Acceleration Phase of Erupting Filaments Involved in Coronal Mass Ejections
Title, Alan M.; Török, Tibor; Kliem, Bernhard +2 more
We examine the early phases of two near-limb filament destabilizations involved in coronal mass ejections (CMEs) on 2005 June 16 and July 27, using high-resolution, high-cadence observations made with the Transition Region and Coronal Explorer (TRACE), complemented by coronagraphic observations by the Mauna Loa Solar Observatory (MLSO) and the Sol…
Hinode observations of transverse waves with flows in coronal loops
Wang, T. J.; Ofman, L.
Aims: We report the first evidence for transverse waves in coronal multithreaded loops with cool plasma ejected from the chromosphere flowing along the threads. These observations are good candidates for coronal seismology.
Methods: We analyzed observations made with Solar Optical Telescope (SOT) on board the Hinode satellite in the Ca II H li…
A New Model for Propagating Parts of EIT Waves: A Current Shell in a CME
Aulanier, G.; Török, T.; Hochedez, J. -F. +1 more
EIT waves are observed in EUV as bright fronts. Some of these bright fronts propagate across the solar disk. EIT waves are all associated with a flare and a CME and are commonly interpreted as fast-mode magnetosonic waves. Propagating EIT waves could also be the direct signature of the gradual opening of magnetic field lines during a CME. We quant…
Precision photometric redshift calibration for galaxy-galaxy weak lensing
Kneib, J. -P.; Cunha, C. E.; Bolzonella, M. +26 more
Accurate photometric redshifts are among the key requirements for precision weak lensing measurements. Both the large size of the Sloan Digital Sky Survey (SDSS) and the existence of large spectroscopic redshift samples that are flux-limited beyond its depth have made it the optimal data source for developing methods to properly calibrate photomet…
IMAGES. III. The evolution of the near-infrared Tully-Fisher relation over the last 6 Gyr
Cesarsky, C.; Östlin, G.; Yang, Y. +22 more
Using the multi-integral field spectrograph GIRAFFE at VLT, we have derived the K-band Tully-Fisher relation (TFR) at z ∼ 0.6 for a representative sample of 65 galaxies with emission lines (W_0(OII)≥15 Å). We confirm that the scatter in the z ∼ 0.6 TFR is caused by galaxies with anomalous kinematics, and find a positive and strong correlation betw…