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Magnetostatic Structures of the Solar Corona. III. Normal and Inverse Quiescent Prominences
Zhang, M.; Low, B. C.
Analytical solutions describing equilibrium magnetic fields in the solar corona, deformed by prominence-like plasma condensations in the Cartesian plane, are treated in this paper. The equilibrium equations for this class of problems usually take different forms in distinct subdomains, separated by free boundaries to be solved as one of the unknow…
Tiny-scale molecular structures in the Magellanic Clouds. I. FUSE, HST and VLT observations
Le Petit, F.; Roueff, E.; André, M. K. +6 more
The objective of this series of two papers is to investigate small-scale molecular structures in the Magellanic Clouds (hereafter MCs). We report on the FUSE detections of the HD and CO molecules on the lines of sight towards three Large Magellanic stars: Sk -67D05, Sk -68D135, and Sk -69D246. HD is also detected for the first time on the lines of…
Methane Abundance Variations toward the Massive Protostar NGC 7538 IRS 9
Blake, G. A.; Boogert, A. C. A.; Öberg, K.
Absorption and emission lines originating from the ν3 CH stretching manifold of gas-phase CH4 were discovered in the high-resolution (R=25,000) infrared L-band spectrum along the line of sight toward NGC 7538 IRS 9. These observations provide a diagnostic of the complex dynamics and chemistry in a massive star-forming region.…
On the Coronal Mass Ejection onset and Coronal Dimming
Howard, Timothy A.; Harrison, Richard A.
A comprehensive case and statistical study of CME onsets has been conducted on the solar limb using the CDS, LASCO and EIT instruments aboard the SOHO spacecraft. This is the first dedicated campaign to establish firmly the EUV signatures of CME onsets and is based on a series of low-corona observing campaigns made in 2002. The event database cons…
Star Clusters in Virgo and Fornax Dwarf Irregular Galaxies
Olsen, Knut; Seth, Anil; Lotz, Jennifer +2 more
We present the results of a search for clusters in dwarf irregular galaxies in the Virgo and Fornax Clusters using Hubble Space Telescope (HST) WFPC2 snapshot data. The galaxy sample includes 28 galaxies, 11 of which are confirmed members of the Virgo and Fornax Clusters. In the 11 confirmed members, we detect 237 cluster candidates and determine …
Dust in Comet 67P/Churyumov-Gerasimenko
Lara, L. M.; López-Moreno, J. J.; Moreno, F. +2 more
Comet 67P/Churyumov-Gerasimenko has been designated the new target for the ESA Rosetta mission, launched successfully on 2004 March 2. We have analyzed an image set taken in 2003 March, in which the comet appeared to have a conspicuous dust antitail. We employed a Monte Carlo code, similar to that by Fulle (1989), by which we have computed the dus…
Abundance constraints and direct redshift measurement of the diffuse X-ray emission from a distant cluster of galaxies
Böhringer, H.; Barcons, X.; Fabian, A. C. +4 more
We report on the XMM-Newton (XMM) observation of RX J1053.7+5735, one of the most distant X-ray selected clusters of galaxies, which also shows an unusual double-lobed X-ray morphology, indicative of a possible equal-mass cluster merger. The cluster was discovered during the ROSAT deep pointings in the direction of the Lockman Hole. All XMM Lockma…
Intermittent Heating of the Solar Corona by Heat Flux-generated Ion Cyclotron Waves
Hollweg, Joseph V.; Markovskii, S. A.
Recently, we suggested that the source of ion heating in solar coronal holes is small-scale reconnection events (microflares) at the coronal base. The microflares launch intermittent heat flux up into the corona exciting ion cyclotron waves through a plasma microinstability. The ions are heated by these waves during the microflare bursts and then …
The Irradiated Herbig-Haro Jets Near σ Orionis
Bally, John; Andrews, Sean M.; Reipurth, Bo +1 more
We present high-resolution echelle spectra of the irradiated Herbig-Haro jets HH 444, 445, 446, and 447 from the Keck I telescope. The structural, kinematic, and physical properties of the jets near their sources are analyzed in detail. In particular, spatio-kinematic electron density variations and evidence for excited, low-velocity entrained mat…
XMM-Newton Spectra of Intermediate-Mass Black Hole Candidates: Application of a Monte Carlo Simulated Model
Wang, Q. Daniel; Yao, Yangsen; Fukui, Wakako +2 more
We present a systematic spectral analysis of six ultraluminous X-ray sources (NGC 1313 X-1 and X-2, IC 342 X-1, Ho IX X-1, NGC 5408 X-1, and NGC 3628 X-1) observed with the XMM-Newton observatory. These extranuclear X-ray sources in nearby late-type galaxies have been considered as intermediate-mass black hole candidates. We have performed Monte C…