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A steady-state supersonic downflow in the transition region above a sunspot umbra
Andretta, Vincenzo; Straus, Thomas; Fleck, Bernhard
We investigate a small-scale (~1.5 Mm along the slit), supersonic downflow of about 90 km s-1 in the transition region above the lightbridged sunspot umbra in AR 11836. The observations were obtained with the Interface Region Spectrograph (IRIS) on 2013 September 2 from 16:40 to 17:59 UT. The downflow shows up as redshifted "satellite" …
A Compton-thick AGN in the barred spiral galaxy NGC 4785
Gandhi, P.; Asmus, D.; Yamada, S. +5 more
We present X-ray observations of the active galactic nucleus (AGN) in NGC 4785. The source is a local Seyfert 2 which has not been studied so far in much detail. It was recently detected with high significance in the 15-60 keV band in the 66-month Swift/BAT (Burst Array Telescope) all sky survey, but there have been no prior pointed X-ray observat…
Exploring the Dust Content of Galactic Winds with Herschel. I. NGC 4631
Veilleux, S.; Müller, T.; Martin, C. +8 more
We present a detailed analysis of deep far-infrared observations of the nearby edge-on star-forming galaxy NGC 4631 obtained with the Herschel Space Observatory. Our Photodetector Array Camera and Spectrometer (PACS) images at 70 and 160 µm show a rich complex of filaments and chimney-like features that extends up to a projected distance of …
Philae's First Days on the Comet
Bibring, J. -P.; Mottola, S.; Alexander, C. +10 more
Stellar laboratories. IV. New Ga iv, Ga v, and Ga vi oscillator strengths and the gallium abundance in the hot white dwarfs G191-B2B and RE 0503-289
Rauch, T.; Werner, K.; Kruk, J. W. +1 more
Context. For the spectral analysis of high-resolution and high-signal-to-noise (S/N) spectra of hot stars, advanced non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These atmospheres are strongly dependent on the reliability of the atomic data that are used to calculate them.
Aims: Reliable Ga iv-vi oscillator stren…
Ultraviolet Spectroscopy of Type IIb Supernovae: Diversity and the Impact of Circumstellar Material
Filippenko, Alexei V.; Modjaz, Maryam; Smith, Nathan +9 more
We present new Hubble Space Telescope (HST) multi-epoch ultraviolet (UV) spectra of the bright Type IIb SN 2013df, and undertake a comprehensive analysis of the set of four SNe IIb for which HST UV spectra are available (SN 1993J, SN 2001ig, SN 2011dh, and SN 2013df). We find strong diversity in both continuum levels and line features among these …
Integrating CRISM and TES hyperspectral data to characterize a halloysite-bearing deposit in Kashira crater, Mars
Mustard, John F.; Goudge, Timothy A.; Head, James W. +2 more
We present morphologic observations and spectral modeling results of a large, kaolin-group mineral-bearing deposit within Kashira crater in the southern highlands of Mars. We employ both non-linear unmixing of Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) visible to near-infrared (VNIR) reflectance data and linear unmixing of Therma…
Models of red giants in the CoRoT asteroseismology fields combining asteroseismic and spectroscopic constraints
Eggenberger, P.; Valentini, M.; Poretti, E. +17 more
Context. The availability of asteroseismic constraints for a large sample of red giant stars from the CoRoT and Kepler missions paves the way for various statistical studies of the seismic properties of stellar populations.
Aims: We use a detailed spectroscopic study of 19 CoRoT red giant stars to compare theoretical stellar evolution models …
67P/Churyumov-Gerasimenko surface properties as derived from CIVA panoramic images
Le Mouélic, S.; Bibring, J. -P.; Gondet, B. +8 more
The structure and composition of cometary constituents, down to their microscopic scale, are critical witnesses of the processes and ingredients that drove the formation and evolution of planetary bodies toward their present diversity. On board Rosetta’s lander Philae, the Comet Infrared and Visible Analyser (CIVA) experiment took a series of imag…
The Herschel Virgo Cluster Survey. XVIII. Star-forming dwarf galaxies in a cluster environment
Boquien, M.; Bianchi, S.; Fritz, J. +22 more
To assess the effects of the cluster environment on the different components of the interstellar medium, we analyse the far-infrared (FIR) and submillimetre (submm) properties of a sample of star-forming dwarf galaxies detected by the Herschel Virgo Cluster Survey (HeViCS). We determine dust masses and dust temperatures by fitting a modified black…