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X-ray spectra of the Fe-L complex
Raassen, A. J. J.; Gu, Liyi; Mao, Junjie +7 more
The Hitomi results on the Perseus cluster have led to improvements in our knowledge of atomic physics that are crucial for the precise diagnostic of hot astrophysical plasma observed with high-resolution X-ray spectrometers. However, modeling uncertainties remains, both within but especially beyond Hitomi's spectral window. A major challenge in sp…
The scattered disc of HR 8799
Booth, Mark; Krivov, Alexander V.; Löhne, Torsten +1 more
HR 8799 is a young F0-type star with four directly imaged giant planets and two debris belts, one located exterior and another one interior to the region occupied by the planetary orbits. Not only having an architecture similar to that of our Solar system but also revealing dissimilarities such as high masses of planets, a huge radial extent, and …
The Formation Conditions of the Wide Binary Class 0 Protostars within BHR 71
Bourke, Tyler L.; Codella, Claudio; Chen, Xuepeng +7 more
We present a characterization of the binary protostar system that is forming within a dense core in the isolated dark cloud BHR71. The pair of protostars, IRS1 and IRS2, are both in the Class 0 phase, determined from observations that resolve the sources from 1 µm out to 250 µm and from 1.3 mm to 1.3 cm. The resolved observations enabl…
Testing dark matter with Cherenkov light — prospects of H.E.S.S. and CTA for exploring minimal supersymmetry
Moulin, Emmanuel; Hryczuk, Andrzej; Jodłowski, Krzysztof +4 more
We provide an updated and improved study of the prospects of the H.E.S.S. and Cherenkov Telescope Array (CTA) experiments in testing neutralino dark matter in the Minimal Supersymmetric Standard Model with nine free parameters (p9MSSM). We include all relevant experimental constraints and theoretical developments, in particular a calculation of th…
Gas velocity structure of the Orion A integral-shaped filament
Stutz, Amelia M.; González Lobos, Vale
We present analysis of the gas kinematics of the integral-shaped filament (ISF) in Orion A using four different molecular lines, 12CO (1-0), 13CO (1-0), NH3 (1,1), and N2H+ (1-0). We describe our method to visualize the position-velocity (PV) structure using the intensity-weighted line velocit…
Tracing Hercules in Galactic azimuth with Gaia DR2
Monari, G.; Siebert, A.; Famaey, B. +4 more
The second data release of the Gaia mission has revealed, in stellar velocity and action space, multiple ridges, the exact origin of which is still debated. Recently, we demonstrated that a large Galactic bar with pattern speed 39 km s-1 kpc-1 creates most of the observed ridges. Among these ridges, the Hercules moving group …
Star-forming clumps in the Lyman Alpha Reference Sample of galaxies - I. Photometric analysis and clumpiness
Hayes, Matthew; Östlin, Göran; Melinder, Jens +4 more
We study young star-forming clumps on physical scales of 10-500 pc in the Lyman-Alpha Reference Sample (LARS), a collection of low-redshift (z = 0.03-0.2) UV-selected star-forming galaxies. In each of the 14 galaxies of the sample, we detect clumps for which we derive sizes and magnitudes in five UV-optical filters. The final sample includes ∼1400…
Mean density inversions for red giants and red clump stars
Reese, D. R.; Eggenberger, P.; Bossini, D. +8 more
Since the CoRoT and Kepler missions, the availability of high-quality seismic spectra for red giants has made them the standard clocks and rulers for Galactic Archeology. With the expected excellent data from the TESS and PLATO missions, red giants will again play a key role in Galactic studies and stellar physics, thanks to the precise masses and…
Organic molecules in the protoplanetary disk of DG Tauri revealed by ALMA
Kamp, I.; Podio, L.; Bacciotti, F. +10 more
Context. Planets form in protoplanetary disks and inherit their chemical compositions.
Aims: It is thus crucial to map the distribution and investigate the formation of simple organics, such as formaldehyde and methanol, in protoplanetary disks.
Methods: We analyze ALMA observations of the nearby disk-jet system around the T Tauri star D…
A Secondary Fan-spine Magnetic Structure in Active Region 11897
Hou, Yijun; Li, Ting; Yang, Shuhong +1 more
Fan-spine is a special topology in solar atmosphere and is closely related to magnetic null point, as well as circular-ribbon flares, which can provide important information for understanding the intrinsic 3D nature of solar flares. However, the fine structure within the fan has rarely been investigated. In present paper, we investigate a secondar…