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Dust Impact Monitor (SESAME-DIM) measurements at comet 67P/Churyumov-Gerasimenko
Flandes, Alberto; Krüger, Harald; Loose, Alexander +9 more
Context. The Rosetta lander Philae successfully landed on the nucleus of comet 67P/Churyumov-Gerasimenko on 12 November 2014. Philae carries the Dust Impact Monitor (DIM) on board, which is part of the Surface Electric Sounding and Acoustic Monitoring Experiment (SESAME). DIM employs piezoelectric PZT sensors to detect impacts by submillimeter- an…
On the Black Hole Mass---X-Ray Excess Variance Scaling Relation for Active Galactic Nuclei in the Low-mass Regime
Yuan, Weimin; Pan, Hai-Wu; Liu, Bifang +2 more
Recent studies of active galactic nuclei (AGNs) found a statistically inverse linear scaling between the X-ray normalized excess variance {σ }{rms}2 (variability amplitude) and the black hole (BH) mass spanning over {M}{BH}={10}6-{10}9 {M}⊙ . Suggested as having a small scatter, thi…
Modeling of the energetic ion observations in the vicinity of Rhea and Dione
Dandouras, Iannis; Krupp, Norbert; Roussos, Elias +1 more
During several flybys of the Cassini spacecraft by the saturnian moons Rhea and Dione the energetic particle detector MIMI/LEMMS measured a significant reduction of energetic ion fluxes (20-300 keV) in their vicinity, which is caused by the absorption of those ions at the moon surfaces.
In order to simulate the observed depletion profiles we …A ∼32-70 K Formation Temperature Range for the Ice Grains Agglomerated by Comet 67 P/Churyumov-Gerasimenko
Altwegg, K.; Rubin, M.; Mousis, O. +4 more
Grand Canonical Monte Carlo simulations are used to reproduce the N2/CO ratio ranging between 1.7 × 10-3 and 1.6 × 10-2 observed in situ in the Jupiter-family comet 67 P/Churyumov-Gerasimenko (67 P) by the ROSINA mass spectrometer on board the Rosetta spacecraft. By assuming that this body has been agglomerated fro…
Solar type II radio bursts associated with CME expansions as shown by EUV waves
Selhorst, C. L.; Cunha-Silva, R. D.; Fernandes, F. C. R.
Aims: We investigate the physical conditions of the sources of two metric type II bursts associated with coronal mass ejection (CME) expansions with the aim of verifying the relationship between the shocks and the CMEs by comparing the heights of the radio sources and of the extreme-ultraviolet (EUV) waves associated with the CMEs.
Metho…
Discovery of a new bona fide luminous blue variable in Norma
Berdnikov, L. N.; Gvaramadze, V. V.; Kniazev, A. Y.
We report the results of optical spectroscopy of the candidate evolved massive star MN44 revealed via detection of a circular shell with the Spitzer Space Telescope. First spectra taken in 2009 May-June showed the Balmer lines in emission as well as numerous emission lines of iron, which is typical of luminous blue variables (LBVs) near the visual…
Nucleus and Mass Loss from Active Asteroid 313P/Gibbs
Mutchler, Max; Jewitt, David; Agarwal, Jessica +3 more
We present Hubble Space Telescope observations of active asteroid 313P/Gibbs (formerly P/2014 S4) taken over the five month interval from 2014 October to 2015 March. This object has been recurrently active near perihelion (at 2.4 AU) in two different orbits, a property that is naturally explained by the sublimation of near surface ice but which is…
Bayesian evidence of the post-Planck curvaton
Byrnes, Christian T.; Hardwick, Robert J.
We perform a Bayesian model comparison for scenarios within the quadratic curvaton model, determining the degree to which both are disfavoured with respect to the ΛCDM concordance model and single-field quadratic inflation, using the recent Planck data release. Despite having three additional model parameters, the simplest curvaton scenario is not…
A Deep XMM-Newton Survey of M33: Point-source Catalog, Source Detection, and Characterization of Overlapping Fields
Williams, Benjamin F.; Blair, William P.; Haberl, Frank +9 more
We have obtained a deep 8 field XMM-Newton mosaic of M33 covering the galaxy out to the D25 isophote and beyond to a limiting 0.2-4.5 keV unabsorbed flux of 5 × 10-16 erg cm-2 s-1 (L \gt 4 × 1034 erg s-1 at the distance of M33). These data allow complete coverage of the galaxy with …
Case and statistical studies on the evolution of hot flow anomalies
Zhao, L. L.; Zhang, H.; Wang, S. +1 more
Hot flow anomalies (HFAs) frequently observed near Earth's bow shock are phenomena resulting from the interaction between interplanetary discontinuities and Earth's bow shock. We identify 199 HFA events using Cluster data from 2001 to 2010 and divide these events into four categories according to the dynamic pressure profile, namely, "-+," "+-," "…