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The gas-to-dust mass ratio of Centaurus A as seen by Herschel
Boquien, M.; Roussel, H.; Cooray, A. +20 more
We present photometry of the nearby galaxy NGC 5128 (Centaurus A) observed with the Photodetector Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Receiver (SPIRE) instruments on board the Herschel Space Observatory, at 70, 160, 250, 350 and 500 µm, as well as new CO J= 3-2 observations taken with the HARP-B instrume…
Gullies and their relationships to the dust-ice mantle in the northwestern Argyre Basin, Mars
Hiesinger, H.; Reiss, D.; Raack, J.
We investigated gullies and their relationships to the atmospherically derived dust-ice mantle and aeolian features in the northwestern part of the Argyre basin. A detailed morphologic map of the Argyre study region allowed us to constrain the stratigraphic relationships and relative ages of gullies. In addition, we investigated the morphologic ch…
Jet Rotation Investigated in the Near-ultraviolet with the Hubble Space Telescope Imaging Spectrograph
Bacciotti, Francesca; Coffey, Deirdre; Eislöffel, Jochen +2 more
We present results of the second phase of our near-ultraviolet investigation into protostellar jet rotation using the Hubble Space Telescope Imaging Spectrograph. We obtain long-slit spectra at the base of five T Tauri jets to determine if there is a difference in radial velocity between the jet borders which may be interpreted as a rotation signa…
Variations of the interstellar extinction law within the nearest kiloparsec
Gontcharov, G. A.
Multicolor photometry from the Tycho-2 and 2MASS catalogues for 11 990 OB and 30 671 K-type red giant branch stars is used to detect systematic large-scale variations of the interstellar extinction law within the nearest kiloparsec. The characteristic of the extinction law, the total-to-selective extinction ratio Rv, which also characterizes the s…
Dynamics of quiescent prominence fine structures analyzed by 2D non-LTE modelling of the Hα line
Heinzel, P.; Schmieder, B.; Gunár, S. +2 more
Aims: We analyze the dynamics of the prominence fine structures of a quiescent prominence observed on April 26, 2007 during a coordinated campaign of several spaceborne and ground-based instruments. We use Lyman spectra observed by SOHO/SUMER and the Hα line spectra obtained by MSDP spectrograph working at the Meudon Solar Tower.
Methods…
Detection of HF emission from the Orion Bar
Ossenkopf, V.; Nagy, Z.; Bergin, E. A. +3 more
Context. The clumpy density structure of photon-dominated regions is well established, but the physical properties of the clumps and of the surrounding interclump medium are only approximately known.
Aims: The aim of this paper is to constrain the physical and chemical conditions in the Orion Bar, a prototypical nearby photon-dominated region…
Impact of the rippling of a perpendicular shock front on ion dynamics
Lembège, B.; Lu, Q. M.; Yang, Z. W.
Both hybrid/full particle simulations and recent experimental results have clearly evidenced that the front of a supercritical quasi-perpendicular shock can be rippled. Recent two-dimensional simulations have focused on two different types of shock front rippling: (1) one characterized by a small spatial scale along the front is supported by lower…
Prior Flaring as a Complement to Free Magnetic Energy for Forecasting Solar Eruptions
Moore, Ronald L.; Falconer, David A.; Barghouty, Abdulnasser F. +1 more
From a large database of (1) 40,000 SOHO/MDI line-of-sight magnetograms covering the passage of 1300 sunspot active regions across the 30° radius central disk of the Sun, (2) a proxy of each active region's free magnetic energy measured from each of the active region's central-disk-passage magnetograms, and (3) each active region's full-disk-passa…
Rebirth of X-Ray Emission from the Born-again Planetary Nebula A30
Steffen, M.; Gruendl, R. A.; Hamann, W. -R. +8 more
The planetary nebula A30 is believed to have undergone a very late thermal pulse resulting in the ejection of knots of hydrogen-poor material. Using multi-epoch Hubble Space Telescope images, we have detected the angular expansion of these knots and derived an age of 850+280 - 150 yr. To investigate the spectral and spatial p…
The Cold Shoulder: Emission Measure Distributions of Active Region Cores
Schmelz, J. T.; Pathak, S.
The coronal heating mechanism for active region core loops is difficult to determine because these loops are often not resolved and cannot be studied individually. Rather, we concentrate on the "inter-moss" areas between loop footpoints. We use observations from the Hinode EUV Imaging Spectrometer and the X-Ray Telescope to calculate the emission …