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Underestimates of magnetic flux in coupled MHD model solar wind solutions
Riley, Pete; Stevens, Michael L.; Linker, Jon A. +1 more
When validated with spacecraft observations, one enduring characteristic of global MHD solar wind models is the tendency to underestimate the interplanetary magnetic flux. This study quantifies the “missing flux” problem for models used in the coordinated Center for Integrated Space Weather Modeling study of corotating interaction regions, and ide…
Thin current sheets in the presence of a guiding magnetic field in Earth's magnetosphere
Malova, H. V.; Delcourt, D. C.; Petrukovich, A. A. +7 more
A self-consistent theory of relatively thin anisotropic current sheets (TCS) in collisionless plasma is developed, taking into account the presence of a guiding field By (all notations are used in the GSM coordinate system). TCS configurations with a finite value of guiding field By are often observed in Earth's magnetotail a…
Evolution of the spectral curvature in the ultraluminous X-ray source Holmberg II X-1
Kaaret, P.; Farrell, S. A.; Poutanen, J. +2 more
Ultraluminous X-ray sources (ULXs) are interesting systems as they can host intermediate-mass black holes. Alternatively, ULXs can represent stellar mass black holes accreting at super-Eddington rates. Recently, spectral curvature or breaks at energies above a few keV have been detected in high-quality ULX spectra. These spectral features have bee…
Modeling the physical and excitation conditions of the molecular envelope of NGC 7027
Alcolea, J.; Santander-García, M.; Bujarrabal, V.
Context. The link between the shaping of bipolar planetary nebulae and the mass ejection activity of their central stars is still poorly understood. Appropriately characterizing the evolution of shells ejected during the late stages of stellar evolution and the interaction between these shells is fundamental to gain insight into the mechanism of n…
The luminosity function and stellar mass-to-light ratio of the massive globular cluster NGC 2419
Dalessandro, E.; Bellazzini, M.; Ibata, R. +1 more
We used archival Hubble Space Telescope Wide Field Camera 3 (WFC3) images to obtain the luminosity function of the remote globular cluster NGC 2419 from 2 mag above the horizontal branch level down to ≃ 3.0 mag below the turn-off point (to MI≃ 6.4), approximately covering the range of initial stellar masses ?. The completeness-corrected…
Determination of Prominence Plasma β from the Dynamics of Rising Plumes
Tripathi, Durgesh; Hillier, Andrew; Hillier, Richard
Observations by the Hinode satellite show in great detail the dynamics of rising plumes, dark in chromospheric lines, in quiescent prominences that propagate from large (~10 Mm) bubbles that form at the base of the prominences. These plumes present a very interesting opportunity to study magnetohydrodynamic (MHD) phenomena in quiescent prominences…
Chandra Observations of Five INTEGRAL Sources: New X-Ray Positions for IGR J16393-4643 and IGR J17091-3624
Rahoui, F.; Tomsick, J. A.; Rodriguez, J. +1 more
The Chandra High Resolution Camera observed the fields of five hard X-ray sources in order to help us obtain X-ray coordinates with subarcsecond precision. These observations provide the most accurate X-ray positions known for IGR J16393-4643 and IGR J17091-3624. The obscured X-ray pulsar IGR J16393-4643 lies at R.A. (J2000) = 16h39
Surface mineralogy and stratigraphy of the lunar South Pole-Aitken basin determined from Clementine UV/VIS and NIR data
Davies, G. R.; Foing, B. H.; Borst, A. M. +1 more
The South Pole-Aitken (SPA) basin, located on the lunar far side, is one of the oldest and largest recognised impact structures in the solar system. The basin is a proposed site for future sample return missions and human bases due to the unique geological environment and its potential for preservation of water ice in areas of near-permanent shado…
Jet-driving protostars identified from infrared observations of the Carina Nebula complex
Grellmann, R.; Preibisch, T.; McLeod, A. F. +3 more
Aims: Jets are excellent signposts for very young embedded protostars, so we want to identify jet-driving protostars as a tracer of the currently forming generation of stars in the Carina Nebula, which is one of the most massive galactic star-forming regions and which is characterised by particularly high levels of massive-star feedback on th…
Sizes, Half-mass Densities, and Mass Functions of Star Clusters in the Merger Remnant NGC 1316: Clues to the Fate of Second-generation Globular Clusters
Goudfrooij, Paul
We study mass functions of globular clusters derived from Hubble Space Telescope/Advanced Camera for Surveys images of the early-type merger remnant galaxy NGC 1316, which hosts a significant population of metal-rich globular clusters of intermediate age (~3 Gyr). For the old, metal-poor ("blue") clusters, the peak mass of the mass function {\cal …