Search Publications
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…
When the Peas Jump around the Pod: How Stellar Clustering Affects the Observed Correlations between Planet Properties in Multiplanet Systems
Kruijssen, J. M. Diederik; Longmore, Steven N.; Chevance, Mélanie
Recent studies have shown that the radii and masses of adjacent planets within a planetary system are correlated. It is unknown how this "peas-in-a-pod" phenomenon originates, whether it is in place at birth or requires evolution, and whether it (initially) applies only to neighboring planets or to all planets within a system. Here we address thes…
Magnetic Helicity Estimations in Models and Observations of the Solar Magnetic Field. IV. Application to Solar Observations
Liu, Y.; Guo, Y.; Pariat, E. +9 more
In this ISSI-supported series of studies on magnetic helicity in the Sun, we systematically implement different magnetic helicity calculation methods on high-quality solar magnetogram observations. We apply finite-volume, discrete flux tube (in particular, connectivity-based) and flux-integration methods to data from Hinode's Solar Optical Telesco…
HYPERS simulations of solar wind interactions with the Earth's magnetosphere and the Moon
Chen, Li-Jen; Roytershteyn, Vadim; Omelchenko, Yuri A. +2 more
The hybrid simulations, where the ions are treated kinetically and the electrons as a fluid, seek to describe ion microphysics with maximum physical fidelity. The hybrid approach addresses the fundamental need for space plasma models to incorporate physics beyond magnetohydrodynamics. Global hybrid simulations must account for a wide range of both…
Multi-tracer analysis of straight depolarisation canals in the surroundings of the 3C 196 field
Haverkorn, Marijke; Turić, Luka; Jelić, Vibor +6 more
Context. Faraday tomography of a field centred on the extragalactic point source 3C 196 with the LOw Frequency ARray (LOFAR) revealed an intertwined structure of diffuse polarised emission with straight depolarisation canals and tracers of the magnetised and multi-phase interstellar medium (ISM), such as dust and line emission from atomic hydrogen…