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Young star clusters in interacting galaxies - NGC 1487 and NGC 4038/4039
Lehnert, M. D.; Vacca, W. D.; Chandar, R. +3 more
We estimate the dynamical masses of several young (≈10 Myr) massive star clusters in two interacting galaxies, NGC 4038/4039 (“The Antennae”) and NGC 1487, under the assumption of virial equilibrium. These are compared with photometric mass estimates from K-band photometry assuming a standard Kroupa IMF. The clusters were selected to have near-inf…
Density structure of an active region and associated moss using Hinode/EIS
Young, P. R.; Mason, H. E.; Del Zanna, G. +1 more
Context: Studying the problem of active region heating requires precise measurements of physical plasma parameters such as electron density, temperature, etc. It is also important to understand the relationship of coronal structures with the magnetic field. The Extreme-ultraviolet Imaging Spectrometer (EIS) aboard Hinode provides a rare opportunit…
Jupiter's changing auroral location
Grodent, Denis; GéRard, Jean-Claude; Saglam, Adem +2 more
We examine the case of significant latitudinal shifts of the Jovian northern auroral emissions appearing in a data set spanning nine years of observations with the Hubble Space Telescope in the far ultraviolet. The extended data set makes it possible to compare the location of the main auroral emission with similar viewing geometries and satellite…
Magnetic double gradient mechanism for flapping oscillations of a current sheet
Semenov, V. S.; Erkaev, N. V.; Biernat, H. K.
A new kind of magnetohydrodynamic waves are analyzed for a current sheet in a presence of a small normal magnetic field component varying along the sheet. As a background, two simplified models of a current sheet are considered with a uniform and nonuniform current distributions in the current sheet. On a basis of these two models, the flapping-ty…
Tracing jet-ISM interaction in young AGN: correlations between [O III] λ 5007 Å and 5-GHz emission
Labiano, A.
Aims: I study the interaction between young AGN and their host galaxies based on their ionized gas and radio emission, and analyze possible implications for radio galaxy evolution.
Methods: The [O III] λ 5007 Å line and 5-GHz radio properties are compared and studied for a large, representative sample of GPS and CSS (i.e., young) quasars and r…
The Long-Term Variability of the X-Ray Sources in NGC 6946 and NGC 4485/4490
Kong, Albert K. H.; Homan, Jeroen; Fridriksson, Joel K. +2 more
We analyze data from five Chandra observations of the spiral galaxy NGC 6946 and from three Chandra observations of the irregular/spiral interacting galaxy pair NGC 4485/4490, with an emphasis on investigating the long-term variability exhibited by the source populations. We detect 90 point sources coincident with NGC 6946 down to luminosities of …
Geology of Shackleton Crater and the south pole of the Moon
Josset, Jean-Luc; Spudis, Paul D.; Bussey, Ben +2 more
Using new SMART-1 AMIE images and Arecibo and Goldstone high resolution radar images of the Moon, we investigate the geological relations of the south pole, including the 20 km-diameter crater Shackleton. The south pole is located inside the topographic rim of the South Pole-Aitken (SPA) basin, the largest and oldest impact crater on the Moon and …
Astrobiology and habitability of Titan
Raulin, Francois
Largest satellite of Saturn and the only in the solar system having a dense atmosphere, Titan is one of the key planetary bodies for astrobiological studies, due to several aspects. (i) Its analogies with planet Earth, in spite of much lower temperatures, with, in particular, a methane cycle on Titan analogous to the water cycle on Earth. (ii) The…
Accurate Mars Express orbits to improve the determination of the mass and ephemeris of the Martian moons
Pätzold, M.; Rosenblatt, P.; Le Maistre, S. +5 more
The determination of the ephemeris of the Martian moons has benefited from observations of their plane-of-sky positions derived from images taken by cameras onboard spacecraft orbiting Mars. Images obtained by the Super Resolution Camera (SRC) onboard Mars Express (MEX) have been used to derive moon positions relative to Mars on the basis of a fit…
The dust trail of Comet 67P/Churyumov Gerasimenko
Reach, William T.; Kelley, Michael S.; Lien, David J.
We report the detection of Comet 67P/Churyumov-Gerasimenko's dust trail and nucleus in 24 µm Spitzer Space Telescope images taken February 2004. The dust trail is not found in optical Palomar images taken June 2003. Both the optical and infrared images show a distinct neck-line tail structure, offset from the projected orbit of the comet. We…