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Fifty Years of 3 He-rich Events
Reames, Donald V.
The early 1970s saw a new and surprising feature in the composition of solar energetic particles (SEPs), resonant enhancements up to 10,000-fold in the ratio 3He/4He that could even make 3He dominant over H in rare events. It was soon learned that these events also had enhancements in the abundances of heavier elements, such as a factor of ~10 enh…
Uncovering fossils of the distant Milky Way with UNIONS: NGC 5466 and its stellar stream
Jensen, Jaclyn; McConnachie, Alan W.; Cuillandre, Jean-Charles +9 more
We examine the spatial clustering of blue horizontal branch (BHB) stars from the u-band of the Canada-France Imaging Survey (CFIS, a component of the Ultraviolet Near-Infrared Optical Northern Survey, or UNIONS). All major groupings of stars are associated with previously known satellites, and among these is NGC 5466, a distant (16 kpc) globular c…
Connecting solar flare hard X-ray spectra to in situ electron spectra. A comparison of RHESSI and STEREO/SEPT observations
Klein, K. -L.; Dresing, N.; Warmuth, A. +4 more
Aims: We aim to constrain the acceleration, injection, and transport processes of flare-accelerated energetic electrons by comparing their characteristics at the Sun with those injected into interplanetary space.
Methods: We have identified 17 energetic electron events well-observed with the SEPT instrument aboard STEREO which show a cle…
Clumpiness of observed and simulated cold circumgalactic gas
Hamanowicz, Aleksandra; Zanella, Anita; Péroux, Céline +3 more
Determining the clumpiness of matter around galaxies is pivotal to a full understanding of the spatially inhomogeneous, multiphase gas in the circumgalactic medium (CGM). We combine high spatially resolved 3D observations with hydrodynamical cosmological simulations to measure the cold circumgalactic gas clumpiness. We present new adaptive-optics-…
Relativistic viscous accretion flow model for ULX sources: a case study for IC 342 X-1
Agrawal, Vivek K.; Nandi, Anuj; Das, Santabrata +2 more
In this paper, we develop a model formalism to study the structure of a relativistic, viscous, optically thin, advective accretion flow around a rotating black hole in presence of radiative coolings. We use this model to examine the physical parameters of the ultra-luminous X-ray sources (ULXs), namely mass (MBH), spin (ak), …
The HOSTS Survey: Evidence for an Extended Dust Disk and Constraints on the Presence of Giant Planets in the Habitable Zone of β Leo
Absil, O.; Bryden, G.; Ertel, S. +38 more
The young (50-400 Myr) A3V star β Leo is a primary target to study the formation history and evolution of extrasolar planetary systems as one of the few stars with known hot (∼1600 K), warm (∼600 K), and cold (∼120 K) dust belt components. In this paper, we present deep mid-infrared measurements of the warm dust brightness obtained with the Large …
Cataclysmic Variables in the Second Year of the Zwicky Transient Facility
Duev, Dmitry A.; Riddle, Reed; Szkody, Paula +17 more
Using a filter in the GROWTH Marshal based on color and the amplitude and timescale of variability, we have identified 372 objects as known or candidate cataclysmic variables (CVs) during the second year of the operation of the Zwicky Transient Facility. From the available difference imaging data, we found that 93 are previously confirmed CVs and …
Evolutionary map of the Universe (EMU): Compact radio sources in the SCORPIO field towards the galactic plane
Umana, G.; Filipović, M. D.; Michałowski, M. J. +26 more
We present observations of a region of the Galactic plane taken during the Early Science Program of the Australian Square Kilometre Array Pathfinder (ASKAP). In this context, we observed the SCORPIO field at 912 MHz with an uncompleted array consisting of 15 commissioned antennas. The resulting map covers a square region of ∼40 deg2, ce…
An X-ray and radio study of the Hubble Frontier Field cluster Abell S1063
Rapetti, David; Rahaman, Majidul; Raja, Ramij +3 more
We present results from Chandra X-ray observations and 325 MHz Giant Metrewave Radio Telescope (GMRT) observations of the massive and X-ray luminous cluster of galaxies Abell S1063. We report the detection of large-scale 'excess brightness' in the residual Chandra X-ray surface brightness map that extends at least 2.7 Mpc towards the north-east fr…
Photo-chemo-dynamical analysis and the origin of the bulge globular cluster Palomar 6
Valentini, M.; Anders, F.; Chiappini, C. +7 more
Context. Palomar 6 (Pal6) is a moderately metal-poor globular cluster projected towards the Galactic bulge. A full analysis of the cluster can give hints on the early chemical enrichment of the Galaxy and a plausible origin of the cluster.
Aims: The aim of this study is threefold: a detailed analysis of high-resolution spectroscopic data obta…