Search Publications
The independent pulsations of Jupiter's northern and southern X-ray auroras
Coates, A. J.; Jackman, C. M.; Jones, G. H. +14 more
Auroral hot spots are observed across the Universe at different scales1 and mark the coupling between a surrounding plasma environment and an atmosphere. Within our own Solar System, Jupiter possesses the only resolvable example of this large-scale energy transfer. Jupiter's northern X-ray aurora is concentrated into a hot spot, which i…
Improvement of solar-cycle prediction: Plateau of solar axial dipole moment
Kusano, K.; Shiota, D.; Imada, S. +2 more
Aims: We report the small temporal variation of the axial dipole moment near the solar minimum and its application to the solar-cycle prediction by the surface flux transport (SFT) model.
Methods: We measure the axial dipole moment using the photospheric synoptic magnetogram observed by the Wilcox Solar Observatory (WSO), the ESA/NASA So…
Diagnosing galactic feedback with line broadening in the low-redshift Lyα forest
Viel, Matteo; Wakker, Bart P.; Kim, Tae-Sun +4 more
We compare the low-redshift (z ≃ 0.1) Lyα forest from hydrodynamical simulations with data from the Cosmic Origins Spectrograph. We find the tension between the observed number of lines with b-parameters in the range of 25-45 km s-1 and the predictions from simulations that incorporate either vigorous feedback from active galactic nucle…
Super-Eddington QSO RX J0439.6-5311 - II. Multiwavelength constraints on the global structure of the accretion flow
Done, Chris; Ward, Martin; Jin, Chichuan +1 more
We present a detailed multiwavelength study of an unobscured, highly super-Eddington Type-1 QSO RX J0439.6-5311. We combine the latest XMM-Newton observation with all archival data from infrared to hard X-rays. The optical spectrum is very similar to that of 1H 0707-495 in having extremely weak [O III] and strong Fe II emission lines, although the…
Complexes of triggered star formation in supergiant shell of Holmberg II
Egorov, Oleg V.; Lozinskaya, Tatiana A.; Moiseev, Alexei V. +1 more
We report a detailed analysis of all regions of current star formation in the walls of the supergiant H I shell (SGS) in the galaxy Holmberg II based on observations with a scanning Fabry-Perot interferometer at the Russian 6-m telescope. We compare the structure and kinematics of ionized gas with that of atomic hydrogen and with the stellar popul…
The large-scale nebular pattern of a superwind binary in an eccentric orbit
Morris, Mark R.; Liu, Sheng-Yuan; Taam, Ronald E. +5 more
Preplanetary nebulae and planetary nebulae are evolved, mass-losing stellar objects that show a wide variety of morphologies. Many of these nebulae consist of outer structures that are nearly spherical (spiral/shell/arc/halo) and inner structures that are highly asymmetric (bipolar/multipolar) 1,2 . The coexistence of such geometrically…
Very Deep inside the SN 1987A Core Ejecta: Molecular Structures Seen in 3D
van Loon, J. Th.; Larsson, J.; Lundqvist, P. +21 more
Most massive stars end their lives in core-collapse supernova explosions and enrich the interstellar medium with explosively nucleosynthesized elements. Following core collapse, the explosion is subject to instabilities as the shock propagates outward through the progenitor star. Observations of the composition and structure of the innermost regio…
CHEERS: The chemical evolution RGS sample
Zhang, Y. -Y.; Finoguenov, A.; Böhringer, H. +17 more
Context. The chemical yields of supernovae and the metal enrichment of the intra-cluster medium (ICM) are not well understood. The hot gas in clusters of galaxies has been enriched with metals originating from billions of supernovae and provides a fair sample of large-scale metal enrichment in the Universe. High-resolution X-ray spectra of cluster…
Magnetized Kelvin-Helmholtz instability: theory and simulations in the Earth's magnetosphere context
Califano, Francesco; Faganello, Matteo
The Kelvin-Helmholtz instability, proposed a long time ago for its role in and impact on the transport properties at magnetospheric flanks, has been widely investigated in the Earth's magnetosphere context. This review covers more than fifty years of theoretical and numerical efforts in investigating the evolution of Kelvin-Helmholtz vortices and …
Constraints on Quenching of Z ≲ 2 Massive Galaxies from the Evolution of the Average Sizes of Star-forming and Quenched Populations in COSMOS
Ilbert, O.; Scoville, N. Z.; Carollo, C. M. +5 more
We use >9400 {log}(m/{M}⊙ )> 10 quiescent and star-forming galaxies at z ≲ 2 in COSMOS/UltraVISTA to study the average size evolution of these systems, with focus on the rare ultra-massive population at {log}(m/{M}⊙ )> 11.4. The large 2 square degree survey area delivers a sample of ∼400 such ultra-massive systems. A…