Search Publications
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 …
Energetic feedback and 26Al from massive stars and their supernovae in the Carina region
Hartmann, D. H.; Preibisch, T.; Diehl, R. +3 more
Aims: We study the populations of massive stars in the Carina region and their energetic feedback and ejection of 26Al.
Methods: We did a census of the stellar populations in young stellar clusters within a few degrees of the Carina nebula. For each star we estimated the mass, based on the spectral type and the host cluster ag…
Herschel/HIFI observations of CO, H2O and NH3 in Monoceros R2
Le Bourlot, J.; Le Petit, F.; Ossenkopf, V. +12 more
Context. Mon R2, at a distance of 830 pc, is the only ultracompact H ii region (UCH ii) where the associated photon-dominated region (PDR) can be resolved with Herschel. Owing to its brightness and proximity, it is one of the best-suited sources for investigating the chemistry and physics of highly UV-irradiated PDRs.
Aims: Our goal is to est…
Uncovering the Birth of a Coronal Mass Ejection from Two-Viewpoint SECCHI Observations
Tsinganos, K.; Vourlidas, A.; Syntelis, P.
We investigate the initiation and formation of Coronal Mass Ejections (CMEs) via a detailed two-viewpoint analysis of low corona observations of a relatively fast CME acquired by the SECCHI instruments aboard the STEREO mission. The event which occurred on 2 January 2008, was chosen because of several unique characteristics. It shows upward motion…
Sound-speed Inversion of the Sun Using a Nonlocal Statistical Convection Theory
Deng, Licai; Christensen-Dalsgaard, Jørgen; Zhang, Chunguang +1 more
Helioseismic inversions reveal a major discrepancy in sound speed between the Sun and the standard solar model just below the base of the solar convection zone. We demonstrate that this discrepancy is caused by the inherent shortcomings of the local mixing-length theory adopted in the standard solar model. Using a self-consistent nonlocal convecti…
The distribution of Titan's high-altitude (out to ∼50,000 km) exosphere from energetic neutral atom (ENA) measurements by Cassini/INCA
Dandouras, I.; Garnier, P.; Krimigis, S. M. +3 more
We report observations of Titan's high-altitude exosphere detected out to about 50,000 km altitude. The observations were made by the Ion Neutral Camera (INCA) on board the Cassini spacecraft. INCA detects energetic neutral atoms (ENA) that are formed when the ambient magnetospheric ions charge exchange with Titan's neutral atmosphere and exospher…