Search Publications
A benchmark event sequence for mass ejection onset studies. A flare associated CME with coronal dimming, ascending pre-flare loops and a transient cool loop
Harrison, R. A.; Bewsher, D.
Aims:In this study, we report on the spectroscopic observations of a particularly well-observed flare and coronal mass ejection (CME) event sequence which we feel can be used as a benchmark study for CME onsets.
Methods: Specifically, we report on a set of extreme-ultraviolet (EUV) spectroscopic observations using the Solar and Heliospheric Ob…
Gas and dust spectra of the D' type symbiotic star HD 330036
Ciroi, S.; Rafanelli, P.; Angeloni, R. +1 more
Aims:We present a comprehensive and self-consistent modelling of the D' type symbiotic star (SS) HD 330036 from radio to UV.
Methods: Within a colliding-wind scenario, we analyse the continuum, line, and dust spectra by means of SUMA, a code that simulates the physical conditions of an emitting gaseous cloud under the coupled effect of ionisat…
The q = 1 peak in the mass-ratios for Hipparcos visual binaries
Söderhjelm, S.
Aims:The magnitude differences for Hipparcos visual binaries give important information about the upper part of their mass-ratio distribution, and in previous studies, the author found a narrow peak at q=1 This excess of equal-mass, wide pairs has not been confirmed in other studies, and the present work aims to strengthen the Hipparcos results. <…
The luminous X-ray hotspot in 4C74.26: synchrotron or inverse-Compton emission?
Fabian, A. C.; Erlund, M. C.; Ballantyne, D. R. +2 more
We report the discovery of an X-ray counterpart to the southern radio hotspot of the largest-known radio quasar 4C74.26 (whose redshift is z = 0.104). Both XMM-Newton and Chandra images reveal the same significant (10arcsec i.e. 19kpc) offset between the X-ray hotspot and the radio hotspot imaged with MERLIN. The peak of the X-ray emission may be …
Distant galaxy clusters in the COSMOS field found by HIROCS
Wolf, C.; Röser, H. -J.; Zatloukal, M. +2 more
We present the first high-redshift gal axy cluster candidate sample from the HIROCS survey found in the COSMOS field. It results from a combination of public COSMOS with proprietary H-band data on a 0.66 square° part of the COSMOS field and comprises 12 candidates in the redshift range 1.23 ≤ z ≤ 1.55. We find an increasing fraction of blue cluste…
Near-simultaneous magnetotail flux rope observations with Cluster and Double Star
Wilson, R. J.; Dandouras, I.; Lucek, E. +6 more
We present observations of three magnetic flux ropes in the tail of the Earth's magnetosphere on 7 August 2004 by the Cluster and Double Star TC-1 spacecraft. The first two flux rope signatures were observed, near-simultaneously, by Cluster and TC-1, which were located at (-16.3, -8.7, 0.10) RE GSM and (-10.3, -7.11, 0.81) RE…
Coronal transients and metric type II radio bursts. II. Accelerations at low coronal heights
Mancuso, S.
In the companion Paper I, Mancuso & Raymond (2004) investigated the relationship between type ii and coronal mass ejection (CME) activity for a sample of twenty-nine CME/shock events that occurred between March and December 1999. Most of the events appeared to lead the type ii emission locations by several minutes and the two sets of speeds we…
Data Archive of the Hinode Mission
Tarbell, T. D.; Harra, L. K.; Shimojo, M. +2 more
All of the Hinode telemetry data are to be reformatted and archived in the DARTS system at ISAS and mirrored to data centers around the word. The archived data are distributed to users through the Internet. This paper gives an overview of the files in the archive, including the file formats. All formats are portable and have heritage from the prev…
Observational Consequences of the Hypothesized Helium-rich Stellar Population in ω Centauri
Terndrup, D. M.; Newsham, G.
In response to the proposed high-helium content stars as an explanation for the double main sequence observed in ω Centauri, we investigated the consequences of such stars elsewhere on the color-magnitude diagram. We concentrated on the horizontal branch, where the effects of high helium are expected to show themselves more clearly. In the process…
Photometric Properties of the Most Massive High-Redshift Galaxies
Hernquist, Lars; Cox, Thomas J.; Hopkins, Philip F. +2 more
We calculate the observable properties of the most massive high-redshift galaxies in the hierarchical formation scenario where stellar spheroid and supermassive black hole growth are fueled by gas-rich mergers. Combining high-resolution hydrodynamical simulations of the hierarchical formation of a z~6 quasar, stellar population synthesis models, t…