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A solar-like magnetic cycle on the mature K-dwarf 61 Cygni A (HD 201091)
Reiners, A.; Donati, J. -F.; Petit, P. +9 more
Context. The long-term monitoring of magnetic cycles in cool stars is a key diagnostic in understanding how dynamo generation and amplification of magnetic fields occur in stars similar in structure to the Sun.
Aims: We investigated the temporal evolution of a possible magnetic cycle of 61 Cyg A. The magnetic cycle is determined from 61 Cyg A…
HerMES: a search for high-redshift dusty galaxies in the HerMES Large Mode Survey - catalogue, number counts and early results
Pérez-Fournon, I.; Ivison, R. J.; Clements, D. L. +25 more
Selecting sources with rising flux densities towards longer wavelengths from Herschel/Spectral and Photometric Imaging Receiver (SPIRE) maps is an efficient way to produce a catalogue rich in high-redshift (z > 4) dusty star-forming galaxies. The effectiveness of this approach has already been confirmed by spectroscopic follow-up observations, …
Azimuthal asymmetries in the debris disk around HD 61005. A massive collision of planetesimals?
Rouan, D.; Pinte, C.; Quanz, S. P. +30 more
Context. Debris disks offer valuable insights into the latest stages of circumstellar disk evolution, and can possibly help us to trace the outcomes of planetary formation processes. In the age range 10 to 100 Myr, most of the gas is expected to have been removed from the system, giant planets (if any) must have already been formed, and the format…
Solar Cycle 25: Another Moderate Cycle?
Schüssler, M.; Jiang, J.; Cameron, R. H.
Surface flux transport simulations for the descending phase of Cycle 24 using random sources (emerging bipolar magnetic regions) with empirically determined scatter of their properties provide a prediction of the axial dipole moment during the upcoming activity minimum together with a realistic uncertainty range. The expectation value for the dipo…
Cold Milky Way HI Gas in Filaments
Kerp, J.; Winkel, B.; Lenz, D. +4 more
We investigate data from the Galactic Effelsberg-Bonn H I Survey, supplemented with data from the third release of the Galactic All Sky Survey (GASS III) observed at Parkes. We explore the all-sky distribution of the local Galactic H I gas with | {v}{{LSR}}| \lt 25 km s-1 on angular scales of 11‧-16‧. Unsharp masking is appli…
Repetitive patterns in rapid optical variations in the nearby black-hole binary V404 Cygni
Ruiz, Javier; Enoto, Teruaki; Nogami, Daisaku +65 more
How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion disks, the state of which depends primarily on the mass-accretion rate. When this rate approaches the critical rate (the Eddington limit), thermal instability is supposed…
Cosmological hints of modified gravity?
Di Valentino, Eleonora; Melchiorri, Alessandro; Silk, Joseph
The recent measurements of cosmic microwave background (CMB) temperature and polarization anisotropies made by the Planck satellite have provided impressive confirmation of the Λ CDM cosmological model. However interesting hints of slight deviations from Λ CDM have been found, including a 95% C.L. preference for a "modified gravity" (MG) structure…
Shining a light on galactic outflows: photoionized outflows
Chisholm, John; Leitherer, Claus; Chen, Yanmei +2 more
We study the ionization structure of galactic outflows in 37 nearby, star-forming galaxies with the Cosmic Origins Spectrograph on the Hubble Space Telescope. We use the O I, Si II, Si III, and Si IV ultraviolet absorption lines to characterize the different ionization states of outflowing gas. We measure the equivalent widths, line widths, and ou…
A narrow, edge-on disk resolved around HD 106906 with SPHERE
Henning, T.; Brandner, W.; Milli, J. +39 more
Context. HD 106906AB is the only young binary system so far around which a planet has been imaged and a debris disk has been shown to exist, thanks to a strong IR excess. As such, it represents a unique opportunity for studying the dynamics of young planetary systems.
Aims: We aim at further investigating the close (tens of au scales) environ…
Hooked Flare Ribbons and Flux-rope-related QSL Footprints
Li, Hui; Aulanier, Guillaume; Schmieder, Brigitte +3 more
We studied the magnetic topology of active region 12158 on 2014 September 10 and compared it with the observations before and early in the flare that begins at 17:21 UT (SOL2014-09-10T17:45:00). Our results show that the sigmoidal structure and flare ribbons of this active region observed by the Solar Dynamics Observatory/Atmospheric Imaging Assem…