Search Publications
Solitary waves observed in the auroral zone: the Cluster multi-spacecraft perspective
Gurnett, D. A.; Balogh, A.; Lakhina, G. S. +15 more
We report on recent measurements of solitary waves made by the Wideband Plasma Wave Receiver located on each of the four Cluster spacecraft at 4.5-6.5RE (well above the auroral acceleration region) as they cross field lines that map to the auroral zones. These solitary waves are observed in the Wideband data as isolated bipolar and trip…
The Discovery of an Evolving Dust-scattered X-Ray Halo around GRB 031203
Schartel, N.; Rodríguez-Pascual, P. M.; Santos-Lleó, M. +9 more
We report the first detection of a time-dependent dust-scattered X-ray halo around a gamma-ray burst (GRB). GRB 031203 was observed by XMM-Newton starting 6 hr after the burst. The halo appeared as concentric ringlike structures centered on the GRB location. The radii of these structures increased with time as t1/2, consistent with smal…
Further Multiwavelength Observations of the SSA 22 Lyα-Emitting Blob
Ivison, R. J.; Frayer, D. T.; Scott, D. +4 more
We present new follow-up observations of the submillimeter luminous Lyα-emitting object in the SSA 22 z=3.09 galaxy overdensity, referred to as ``blob 1'' by Steidel and coworkers. In particular, we discuss high-resolution Hubble Space Telescope (HST) optical imaging, Owens Valley Radio Observatory (OVRO) spectral imaging, Keck spectroscopy, Very …
Displacement of X-ray sources from star clusters in starburst galaxies
Zezas, A.; Gallagher, J. S.; Kaaret, P. +3 more
We examine the spatial offsets between X-ray point sources and star clusters in three starburst galaxies. We find that the X-ray sources are preferentially located near the star clusters. Because the star clusters are very good tracers of the star formation activity in the galaxies, this indicates that the X-ray sources are young objects associate…
XMM-Newton and VLT observations of the isolated neutron star 1E 1207.4-5209
Caraveo, P. A.; Bignami, G. F.; Mereghetti, S. +3 more
In August 2002, XMM-Newton devoted two full orbits to the observation of 1E 1207.4-5209, making this isolated neutron star the most deeply scrutinized galactic target of the mission. Thanks to the high throughput of the EPIC instrument, ∼360 000 photons were collected from the source, allowing a very sensitive study of the temporal and spectral be…
The Secrets of the Nearest Starburst Cluster. I. Very Large Telescope/ISAAC Photometry of NGC 3603
Grebel, Eva K.; Brandner, Wolfgang; Stolte, Andrea +2 more
VLT/ISAAC JHKL photometry with subarcsecond resolution of the dense, massive starburst cluster NGC 3603 YC forming the core of the NGC 3603 giant molecular cloud is analyzed to reveal characteristics of the stellar population in unprecedented detail. The color-magnitude plane features a strong pre-main-sequence/main-sequence (PMS/MS) transition re…
Synthetic stellar populations: single stellar populations, stellar interior models and primordial protogalaxies
Jimenez, Raul; Dunlop, James S.; Peacock, John A. +2 more
We present a new set of stellar interior and synthesis models for predicting the integrated emission from stellar populations in star clusters and galaxies of arbitrary age and metallicity. This work differs from existing spectral synthesis codes in a number of important ways, namely (1) the incorporation of new stellar evolutionary tracks, with s…
Sensitivity of Acoustic Wave Travel Times to Sound-Speed Perturbations in the Solar Interior
Kosovichev, A. G.; Birch, A. C.; Duvall, T. L., Jr.
For time-distance helioseismology, it is important to establish the relationship between the travel times of acoustic waves propagating between different points on the solar surface through the solar interior and local perturbations to the sound speed in the propagation region. We use the Born approximation to derive a general expression for the l…
Chain Galaxies in the Tadpole Advanced Camera for Surveys Field
Elmegreen, Bruce G.; Elmegreen, Debra Meloy; Sheets, Clara M.
Colors and magnitudes were determined for 69 chain galaxies, 58 other linear structures, 32 normal edge-on galaxies, and all of their large star formation clumps in the Hubble Space Telescope Advanced Camera for Surveys field of the Tadpole galaxy. Redshifts of 0.5-2 are inferred from comparisons with published color-evolution models. The linear g…
Deep SAURON spectral imaging of the diffuse Lyman α halo LAB1 in SSA 22
Sullivan, M.; Chapman, S.; Bower, R. G. +6 more
We have used the SAURON panoramic integral field spectrograph to study the structure of the Lyα emission-line halo, LAB1, surrounding the submillimetre galaxy SMM J221726+0013. This emission-line halo was discovered during a narrow-band imaging survey of the z= 3.1 large-scale structure in the SSA 22 region. Our observations trace the emission hal…