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A submillimetre survey of Lyman α haloes in the SA22 protocluster at z= 3.1
Ivison, R. J.; Taniguchi, Y.; Smail, Ian +7 more
We present the results from a submillimetre (submm) survey of a sample of 23 giant Lyman α (Lyα) emitting nebulae in the overdensity at z= 3.09 in the SA22 field. These objects, which have become known as Lyα Blobs (LABs), have a diverse range of morphology and surface brightness, but the nature of their power source remains unclear, with both coo…
Hubble Space Telescope Imaging of the Primary Shock Front in the Cygnus Loop Supernova Remnant
Blair, William P.; Raymond, John C.; Sankrit, Ravi
We present Hubble Space Telescope WFPC2 narrowband Hα (F656N) and [O III] λ5007 (F502N) imaging of two fields on the northeastern limb of the Cygnus Loop supernova remnant. This region provides an outstanding example of the initial encounter between the primary blast wave and the surrounding interstellar medium. The Hα images show the primary nonr…
The Double Star mission
Escoubet, C. P.; Liu, Z. X.; Shen, C. +4 more
The Double Star Programme (DSP) was first proposed by China in March, 1997 at the Fragrant Hill Workshop on Space Science, Beijing, organized by the Chinese Academy of Science. It is the first mission in collaboration between China and ESA. The mission is made of two spacecraft to investigate the magnetospheric global processes and their response …
Evidence of Primordial Clustering around the QSO SDSS J1030+0524 at z=6.28
Panagia, N.; Djorgovski, S. G.; Stern, D. +7 more
We present tentative evidence of primordial clustering, manifested as an excess of color-selected objects in the field of the QSO SDSS J1030+0524 at redshift z=6.28. We have selected objects red in i775-z850 on the basis of Hubble Space Telescope Advanced Camera for Surveys imaging of a field centered on the QSO. Compared to …
Jet rotation: Launching region, angular momentum balance and magnetic properties in the bipolar outflow from RW Aur
Ray, T. P.; Eislöffel, J.; Marconi, A. +3 more
Using STIS on board the HST we have obtained a spectroscopic map of the bipolar jet from
Central position of the source region of storm-time chorus
Gurnett, D. A.; Pickett, J. S.; Santolík, O. +2 more
We describe an analysis method to estimate the central position of the source region of electromagnetic waves. The method is based on simultaneous measurements of the Poynting flux in several points in space. We analyze measurements of whistler-mode chorus by the four spacecraft of the Cluster mission close to their perigee at a radial distance of…
High-speed coronal rain
Peter, H.; Hansteen, V. H.; De Groof, A. +1 more
At high spatial and temporal resolution, coronal loops are observed to have a highly dynamic nature. Recent observations with SOHO and TRACE frequently show localized brightenings "raining" down towards the solar surface. What is the origin of these features? Here we present for the first time a comparison of observed intensity enhancements from a…
Dust-enshrouded giants in clusters in the Magellanic Clouds
van Loon, J. Th.; Zijlstra, A. A.; Marshall, J. R.
We present the results of an investigation of post-Main Sequence mass loss from stars in clusters in the Magellanic Clouds, based around an imaging survey in the L'-band (3.8 µm) performed with the VLT at ESO. The data are complemented with JHKs (ESO and 2MASS) and mid-IR photometry (TIMMI2 at ESO, ISOCAM on-board ISO, and data fr…
Statistics of Active Region Complexity: A Large-Scale Fractal Dimension Survey
Gallagher, Peter T.; McAteer, R. T. James; Ireland, Jack
A quantification of the magnetic complexity of active regions using a fractal dimension measure is presented. This fully automated approach uses full-disk MDI magnetograms of active regions from a large data set (2742 days of the SOHO mission, 9342 active region images) to compare the calculated fractal dimension of each region to both its Mount W…
The star-forming environment of an ultraluminous X-ray source in NGC4559: an optical study
Cropper, Mark; Soria, Roberto; Wu, Kinwah +2 more
We have studied the candidate optical counterparts and the stellar population in the star-forming complex around the bright ultraluminous X-ray source (ULX) in the western part of the spiral galaxy NGC4559, using the HST Wide Field Planetary Camera 2 (WFPC2), XMM-Newton/Optical Monitor and ground-based data. We find that the ULX is located near a …