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67P/Churyumov-Gerasimenko's dust activity from pre- to post-perihelion as detected by Rosetta/GIADA
Fulle, M.; Güttler, C.; Tubiana, C. +18 more
We characterized the 67P/Churyumov-Gerasimenko's dust activity, by analysing individual dust particle velocity and momentum measurements of Grain Impact Analyser and Dust Accumulator (GIADA), the dust detector onboard the ESA/Rosetta spacecraft, collecting dust from tens to hundreds of kilometres from the nucleus. Specifically, we developed a proc…
On the Relation between the Hard X-Ray Photon Index and Accretion Rate for Super-Eddington Accreting Quasars
Luo, Bin; Huang, Jian; Du, Pu +3 more
We investigate whether the correlation between the hard X-ray photon index ( ${\rm{\Gamma }}$ ) and accretion rate for super-Eddington accreting quasars is different from that for sub-Eddington accreting quasars. We construct a sample of 113 bright quasars from the Sloan Digital Sky Survey Data Release 14 quasar catalog, with 38 quasars as the sup…
ROSINA ion zoo at Comet 67P
Altwegg, K.; Balsiger, H.; Fuselier, S. A. +9 more
Context. The Rosetta spacecraft escorted Comet 67P/Churyumov-Gerasimenko for 2 yr along its journey through the Solar System between 3.8 and 1.24 au. Thanks to the high resolution mass spectrometer on board Rosetta, the detailed ion composition within a coma has been accurately assessed in situ for the very first time.
Aims: Previous cometary…
A broad-band X-ray spectral study of the Seyfert 1 galaxy ESO 141-G055 with XMM-Newton and NuSTAR
Laha, Sibasish; Ghosh, Ritesh
We have extensively studied the broad--band X-ray spectra of the source ESO 141-G055 using all available XMM-Newton and NuSTAR observations. We detect a prominent soft excess below $2\rm \, \, {\rm keV}$ , a narrow Fe line, and a Compton hump ( $\gt 10\rm \, \, {\rm keV}$ ). The origin of the soft excess is still debated. We used two models to des…
Environmental processing in cluster core galaxies at z = 1.7
Castignani, G.; Combes, F.; Salomé, P.
Today, the brightest cluster galaxies (BCGs) are passive and very massive galaxies at the center of their clusters, and they still accrete mass through swallowing companions and gas from cooling flows. However their formation history is not well known. We report CO(4→3) and continuum map observations of the SpARCS1049+56 BCG at z = 1.709, one of t…
Galaxy and mass assembly: luminosity and stellar mass functions in GAMA groups
Wang, L.; Brough, S.; Holwerda, B. W. +14 more
How do galaxy properties (such as stellar mass, luminosity, star formation rate, and morphology) and their evolution depend on the mass of their host dark matter halo? Using the Galaxy and Mass Assembly group catalogue, we address this question by exploring the dependence on host halo mass of the luminosity function (LF) and stellar mass function …
Steady Wind-blown Cavities within Infalling Rotating Envelopes: Application to the Broad Velocity Component in Young Protostars
Johnstone, Doug; Cabrit, Sylvie; Kristensen, Lars E. +1 more
Wind-driven outflows are observed around a broad range of accreting objects throughout the universe, ranging from forming low-mass stars to supermassive black holes. We study the interaction between a central isotropic wind and an infalling, rotating envelope, which determines the steady-state cavity shape formed at their interface under the assum…
A Small-scale Filament Eruption Inducing a Moreton Wave, an EUV Wave, and a Coronal Mass Ejection
Xue, Zhike; Yan, Xiaoli; Wang, Jincheng +3 more
With the launch of the Solar Dynamic Observatory, many extreme ultraviolet (EUV) waves have been observed during solar eruptions. However, joint observations of Moreton and EUV waves are still relatively rare. We present an event in active region NOAA 12740 wherein a small-scale filament eruption simultaneously results in a Moreton wave, an EUV wa…
Ganymede's Far-Ultraviolet Reflectance: Constraining Impurities in the Surface Ice
Nichols, J. D.; Raut, U.; Retherford, K. D. +2 more
We present reflectance spectra of Ganymede's leading and trailing hemispheres in the wavelength range 138-215 nm, obtained by the Hubble Space Telescope Cosmic Origins Spectrograph (HST/COS) in 2014. The most notable feature of both spectra is the absence of a sharp water absorption edge at ~165 nm, seen in laboratory measurements of ice reflectiv…
Cloud Atlas: High-precision HST/WFC3/IR Time-resolved Observations of Directly Imaged Exoplanet HD 106906b
Schneider, Glenn; Metchev, Stanimir; Apai, Dániel +10 more
HD 106906b is an $\sim 11{M}_{\mathrm{Jup}}, ∼15 Myr old directly imaged exoplanet orbiting at an extremely large distance from its host star. The wide separation (7"11) between HD 106906b and its host star greatly reduces the difficulty in direct-imaging observations, making it one of the most favorable directly imaged exoplanets for detailed cha…