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Longitudinal and local time asymmetries of magnetospheric turbulence in Saturn's plasma sheet
Saur, Joachim; von Papen, Michael
Based on earlier studies that have shown Saturn's middle magnetosphere to contain turbulent magnetic field fluctuations, we analyze the spatial and temporal variations of the magnetic fluctuations and turbulent heating rate as a function of local time and magnetic phase. The region of study is Saturn's plasma sheet at a distance of 6-20 Rs
X-Ray Sources in the Dwarf Spheroidal Galaxy Draco
Sonbas, E.; Dhuga, K. S.; Kargaltsev, O. +3 more
We present the spectral analysis of an 87 ks XMM-Newton observation of Draco, a nearby dwarf spheroidal galaxy. Of the approximately 35 robust X-ray source detections, we focus our attention on the brightest of these sources, for which we report X-ray and multiwavelength parameters. While most of the sources exhibit properties consistent with acti…
A comparison of properties of different population radio galaxies based on the Planck mission microwave data
Verkhodanov, O. V.; Solovyov, D. I.; Khabibullina, M. L. +1 more
Applying the stacking method, we examine the areas of the cosmic microwave background radiation (CMB) maps, constructed according to the Planck SpaceObservatory data in the neighbourhood of different populations of radio sources and giant elliptical galaxies. The samples of objects include giant radio galaxies (GRG), radio sources, selected by the…
A Global Astrometric Solution for Pan-STARRS Referenced to ICRF2
Frouard, J.; Dorland, B. N.; Makarov, V. V. +13 more
We describe the development and application of a Global Astrometric Solution (GAS) to the problem of Pan-STARRS1 (PS1) astrometry. Current PS1 astrometry is based on differential astrometric measurements using 2MASS reference stars, and thus PS1 astrometry inherits the errors of the 2MASS catalog. The GAS, based on a single, least-squares adjustme…
Long-term trends of magnetic bright points. I. Number of magnetic bright points at disc centre
Veronig, A.; Utz, D.; Hanslmeier, A. +5 more
Context. The Sun shows an activity cycle that is caused by its varying global magnetic field. During a solar cycle, sunspots, I.e. extended regions of strong magnetic fields, occur in activity belts that are slowly migrating from middle to lower latitudes, finally arriving close to the equator during the cycle maximum phase. While this and other f…
Systematic Uncertainties in the Spectroscopic Measurements of Neutron-star Masses and Radii from Thermonuclear X-Ray Bursts. III. Absolute Flux Calibration
Marshall, Herman; Güver, Tolga; Özel, Feryal +3 more
Many techniques for measuring neutron star radii rely on absolute flux measurements in the X-rays. As a result, one of the fundamental uncertainties in these spectroscopic measurements arises from the absolute flux calibrations of the detectors being used. Using the stable X-ray burster, GS 1826-238, and its simultaneous observations by Chandra HE…
The data processing pipeline for the Herschel SPIRE Fourier Transform Spectrometer
Valtchanov, I.; Hopwood, R.; Lu, N. +13 more
We present the data processing pipeline to generate calibrated data products from the Spectral and Photometric Imaging Receiver (SPIRE) imaging Fourier Transform Spectrometer on the Herschel Space Observatory. The pipeline processes telemetry from SPIRE observations and produces calibrated spectra for all resolution modes. The spectrometer pipelin…
Spitzer IRAC Observations of IR Excess in Holmberg IX X-1: A Circumbinary Disk or a Variable Jet?
Roberts, T. P.; Berghea, C. T.; Dudik, R. P. +4 more
We present Spitzer Infrared Array Camera photometric observations of the ultraluminous X-ray source (ULX, X-1) in Holmberg IX. We construct a spectral energy distribution (SED) for Holmberg IX X-1 based on published optical, UV, and X-ray data combined with the IR data from this analysis. We modeled the X-ray and optical data with disk and stellar…
Evidence for dust-driven, radial plasma transport in Saturn's inner radiation belts
Krupp, N.; Roussos, E.; Krimigis, S. M. +4 more
A survey of Cassini MIMI/LEMMS data acquired between 2004 and 2015 has led to the identification of 13 energetic electron microsignatures that can be attributed to particle losses on one of the several faint rings of the planet. Most of the signatures were detected near L-shells that map between the orbits of Mimas and Enceladus or near the G-ring…
Subarcsecond bright points and quasi-periodic upflows below a quiescent filament observed by IRIS
Zhang, J.; Li, T.
Context. The new Interface Region Imaging Spectrograph (IRIS) mission provides high-resolution observations of UV spectra and slit-jaw images (SJIs). These data have become available for investigating the dynamic features in the transition region (TR) below the on-disk filaments.
Aims: The driver of "counter-streaming" flows along the filamen…