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Covariance of lucky images: performance analysis
Ginski, C.; Mugrauer, M.; Seeliger, M. +5 more
The covariance of ground-based lucky images is a robust and easy-to-use algorithm that allows us to detect faint companions surrounding a host star. In this paper, we analyse the relevance of the number of processed frames, the frames' quality, the atmosphere conditions and the detection noise on the companion detectability. This analysis has been…
A Molecular-line Study of the Interstellar Bullet Engine IRAS05506+2414
Morris, Mark R.; Lee, Chin-Fei; Patel, Nimesh +3 more
We present interferometric and single-dish molecular line observations of the interstellar bullet-outflow source IRAS 05506+2414, whose wide-angle bullet spray is similar to the Orion BN/KL explosive outflow and likely arises from an entirely different mechanism than the classical accretion-disk-driven bipolar flows in young stellar objects. The b…
Fourier transform spectrometers for remote sensing of planetary atmospheres and surfaces
Korablev, Oleg; Grigoriev, Alexey; Ignatiev, Nikolay +14 more
In planetary research, Fourier transform infrared spectrometers (FTIR) solve a number of important scientific goals related both to the atmosphere and to the surface sounding. For remote orbital measurements, these goals are the thermal sounding of the atmosphere using, in particular, the 15-µm CO2 band, sensitive detections of minor ga…
The study of umbral dots in sunspots based on SOT/Hinode observations
Ebadi, H.; Abbasvand, V.; Pourjavadi, H.
To understand the energy transport in sunspots, it is necessary to investigate the dynamic properties of umbral dots (UDs). In this connection, we used high-resolution SOT/Hinode time-series images. The intensity oscillations of UDs are determined. We conclude that their periods are in the range of 3-5 min, which may be related to the propagation …
Spectral Energy Distribution Mapping of Two Elliptical Galaxies on Sub-kpc Scales
Gaspari, M.; Amblard, A.; Temi, P. +1 more
We use high-resolution Herschel-PACS data of two nearby elliptical galaxies, IC 1459 and NGC 2768, to characterize their dust and stellar content. IC 1459 and NGC 2768 have an unusually large amount of dust for elliptical galaxies ((1-3) × 105 {M}⊙ ); this dust is also not distributed along the stellar content. Using data fro…
Magnetic signatures of ion cyclotron waves during Cassini's high-inclination orbits of Saturn
Simon, Sven; Meeks, Zachary
Based on magnetic field data from Cassini's high-inclination orbits of Saturn (radius RS = 60 , 268 km), we analyze the latitudinal distribution of ion cyclotron waves in the giant planet's magnetosphere. Our survey takes into account magnetic field data from all high-inclination orbits between 2004 and 2015. We analyze the dependency o…
The role of the background in past and future X-ray missions
Molendi, Silvano
Background has played an important role in X-ray missions, limiting the exploitation of science data in several and sometimes unexpected ways. In this presentation I review past X-ray missions focusing on some important lessons we can learn from them. I then go on discussing prospects for overcoming background related limitations in future ones.
Dependence of the Peak Fluxes of Solar Energetic Particles on CME 3D Parameters from STEREO and SOHO
Moon, Y. -J.; Lee, Harim; Park, Jinhye
We investigate the relationships between the peak fluxes of 18 solar energetic particle (SEP) events and associated coronal mass ejection (CME) 3D parameters (speed, angular width, and separation angle) obtained from SOHO, and STEREO-A/B for the period from 2010 August to 2013 June. We apply the STEREO CME Analysis Tool (StereoCAT) to the SEP-asso…
Global geomagnetic responses to the IMF Bz fluctuations during the September/October 2003 high-speed stream intervals
Echer, Ezequiel; Korth, Axel; José Alves Bolzan, Mauricio +1 more
In this paper, we follow the coupling from the solar wind to the Earth's magnetotail, geosynchronous orbit, auroral zone and to the ground, during periods of Alfvénic fluctuations in high-speed solar wind streams (HSSs) and their corotating interaction regions (CIRs). We employ cross-wavelet analysis of magnetic field, particle flux and auroral el…
Open star clusters in the Milky Way. Comparison of photometric and trigonometric distance scales based on Gaia TGAS data
Reffert, Sabine; Scholz, Ralf-Dieter; Kovaleva, Dana A. +5 more
Context. The global survey of star clusters in the Milky Way (MWSC) is a comprehensive list of 3061 objects that provides, among other parameters, distances to clusters based on isochrone fitting. The Tycho-Gaia Astrometric Solution (TGAS) catalogue, which is a part of Gaia data release 1 (Gaia DR1), delivers accurate trigonometric parallax measur…