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NuSTAR observation of the supergiant fast X-ray transient IGR J11215-5952 during its 2017 outburst
Tiengo, A.; Sidoli, L.; Esposito, P. +4 more
We report on the results of a NuSTAR observation of the supergiant fast X-ray transient pulsar IGR J11215-5952 during the peak of its outburst in June 2017. IGR J11215-5952 is the only SFXT undergoing strictly periodic outbursts (every 165 days). NuSTAR caught several X-ray flares, spanning a dynamic range of 100, and detected X-ray pulsations at …
X-ray study of the merging galaxy cluster Abell 3411-3412 with XMM-Newton and Suzaku
Simionescu, A.; Kaastra, J. S.; Zhang, X. +3 more
Context. Previous Chandra observations of the
Gas Kinematics of the Massive Protocluster G286.21+0.17 Revealed by ALMA
Tan, Jonathan C.; Lim, Wanggi; Andersen, Morten +2 more
We study the gas kinematics and dynamics of the massive protocluster G286.21+0.17 with the Atacama Large Millimeter/submillimeter Array using spectral lines of C18O(2-1), ${{\rm{N}}}_{2}{{\rm{D}}}^{+}$ (3-2), ${\mathrm{DCO}}^{+}$ (3-2), and $\mathrm{DCN}$ (3-2). On the parsec clump scale, C18O emission appears highly filament…
Strengthening the bounds on the r-mode amplitude with X-ray observations of millisecond pulsars
Göğüş, Ersin; Güver, Tolga; Schwenzer, Kai +1 more
R-mode oscillations have been shown to have a significant potential to constrain the composition of fast spinning neutron stars. Due to their high rotation rates, millisecond pulsars (MSPs) provide a unique platform to constrain the properties of such oscillations, if their surface temperatures can be inferred. We present the results of our invest…
Self-consistent method to extract non-linearities from pulsating star light curves - I. Combination frequencies
Garrido, R.; Pascual-Granado, J.; Lares-Martiz, M.
Stellar pulsation is a common phenomenon and is sustained because of coherent driving mechanisms. When pulsations are driven by heat or convective mechanisms, it is usual to observe combination frequencies in the power spectra of the stellar light-curves. These combination frequencies are not solutions of the perturbed stellar structure equations.…
Intrusion of Magnetic Peninsula toward the Neighboring Opposite-polarity Region That Triggers the Largest Solar Flare in Solar Cycle 24
Inoue, Satoshi; Bamba, Yumi; Imada, Shinsuke
The largest X9.3 solar flare in solar cycle 24 and the preceding X2.2 flare occurred on 2017 September 6, in the solar active region NOAA 12673. This study aims to understand the onset mechanism of these flares via analysis of multiple observational data sets from the Hinode and Solar Dynamics Observatory and results from a nonlinear force-free fi…
FIDO-SIT: The First Forward Model for the In Situ Magnetic Field of CME-Driven Sheaths
Jian, L. K.; Nieves-Chinchilla, T.; Kay, C.
We have shown previously that the in situ magnetic field of coronal mass ejections (CMEs) can be well reproduced by simple, physics-driven flux rope models using the ForeCAT In situ Data Observer (FIDO, Kay et al., 2017). Here, we show that a similar approach can be taken to forward model the shock and sheath of a CME (Sheath Induced by Transient …
Saturn's Atmospheric Helium Abundance from Cassini Composite Infrared Spectrometer Data
Achterberg, Richard K.; Flasar, F. Michael
We use thermal infrared data from the Composite Infrared Spectrometer, which was on board the Cassini orbiter, to retrieve the helium abundance in Saturn's visible atmosphere. We find that the data is most consistent with a helium-to-hydrogen mole ratio in the range between 0.04 and 0.075, near the lower end of previous measurements, and implying …
The MOSDEF survey: an improved Voronoi binning technique on spatially resolved stellar populations at z ∼ 2
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +12 more
We use a sample of 350 star-forming galaxies at 1.25 < z < 2.66 from the Multi-Object Spectrograph For Infra-Red Exploration (MOSFIRE) Deep Evolution Field survey to demonstrate an improved Voronoi binning technique that we use to study the properties of resolved stellar populations in z ~ 2 galaxies. Stellar population and dust maps are con…
Magnetospheric Interactions of Saturn's Moon Dione (2005-2015)
Krupp, N.; Jones, G. H.; Roussos, E. +5 more
The moon Dione orbits Saturn at 6.2 Saturn radii RS deep in the Kronian magnetosphere. In situ studies of the moon-magnetosphere interaction processes near Dione were possible with the Cassini/Huygens mission which flew by close to Dione five times at distances between 99 and 516 km. In addition, Cassini crossed Dione's L-shell more tha…