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The Deflection of the Cartwheel CME: ForeCAT Results
Landi, Enrico; Kay, Christina; Capannolo, Luisa +1 more
We analyze the Cartwheel coronal mass ejection's (CME; 2008 April 9) trajectory in the low corona with the ForeCAT model. This complex event presented a significant rotation in the low corona and a reversal in its original latitude direction. We successfully reproduce the observed CME’s trajectory (latitude and longitude deflection) and speed. Thr…
The Roles of Reconnected Flux and Overlying Fields in CME Speeds
Welsch, Brian T.; Deng, Minda
Researchers have reported i) correlations of coronal mass ejection (CME) speeds and the total photospheric magnetic flux swept out by flare ribbons in flare-associated eruptive events, and, separately, ii) correlations of CME speeds and more rapid decay, with height, of magnetic fields in potential-field coronal models above eruption sites. Here, …
IRTF/TEXES observations of the H II regions H1 and H2 in the Galactic Centre
Wang, Q. Daniel; Dong, Hui; Schödel, Rainer +6 more
We present new [Ne II] (12.8 µm) IRTF/TEXES observations of the Galactic Center H II regions H1 and H2, which are at a projected distance of ∼11 pc from the centre of the Galaxy. The new observations allow us to map the radial velocity distributions of ionized gas. The high spectroscopic resolution (∼4 km s-1) helps us to disentan…
Whistler Mode Waves Below Lower Hybrid Resonance Frequency: Generation and Spectral Features
Balikhin, M. A.; Shklyar, D. R.
Equatorial noise in the frequency range below the lower hybrid resonance frequency, whose structure is shaped by high proton cyclotron harmonics, has been observed by the Cluster spacecraft. We develop a model of this wave phenomenon which assumes (as, in general, has been suggested long ago) that the observed spectrum is excited due to loss cone …
Fe K and ejecta emission in SNR G15.9+0.2 with XMM-Newton
Acero, Fabio; Maggi, Pierre
Aims: We present a study of the Galactic supernova remnant SNR G15.9+0.2 with archival XMM-Newton observations.
Methods: EPIC data are used to investigate the morphological and spectral properties of the remnant, searching in particular for supernova ejecta and Fe K line emission. By comparing the SNR's X-ray absorption column density wi…
Interstellar medium conditions in z 0.2 Lyman-break analogs
Berta, S.; Magnelli, B.; Lutz, D. +16 more
We present an analysis of far-infrared (FIR) [CII] and [OI] fine structure line and continuum observations obtained with Herschel/PACS, and 12CO(1-0) observations obtained with the IRAM Plateau de Bure Interferometer, of Lyman-break analogs (LBAs) at z 0.2. The principal aim of this work is to determine the typical interstellar medium (…
The chemical structure of the Class 0 protostellar envelope NGC 1333 IRAS 4A
Caux, E.; van der Tak, F. F. S.; Boogert, A. C. A. +2 more
Context. It is not well known what drives the chemistry of a protostellar envelope, in particular the role of the stellar mass and the protostellar outflows on the chemical enrichment of such environments.
Aims: We study the chemical structure of the Class 0 protostellar envelope NGC 1333 IRAS 4A in order to (I) investigate the influence of t…
Transit probabilities around hypervelocity and runaway stars
Ginsburg, I.; Fragione, G.
In the blooming field of exoplanetary science, NASA's Kepler Space Telescope has revolutionized our understanding of exoplanets. Kepler's very precise and long-duration photometry is ideal for detecting planetary transits around Sun-like stars. The forthcoming Transiting Exoplanet Survey Satellite (TESS) is expected to continue Kepler's legacy. Al…
A search for pre- and proto-brown dwarfs in the dark cloud Barnard 30 with ALMA
Ménard, F.; de Gregorio-Monsalvo, I.; Eiroa, C. +9 more
Context. The origin of brown dwarfs is still under debate. While some models predict a star-like formation scenario, others invoke a substellar mass embryo ejection, a stellar disk fragmentation, or the photo-evaporation of an external core due to the presence of massive stars.
Aims: The aim of our work is to characterize the youngest and low…
Setting the scene: what did we know before Rosetta?
Meech, K. J.
This paper provides an overview of our state of knowledge about comets prior to the Rosetta mission encounter. Starting with the historical perspective, this paper discusses the development of comet science up to the modern era of space exploration. The extent to which comets are tracers of solar system formation processes or preserve pristine int…