Search Publications
Missions
Journals
Publication Years
Gravitational Lensing and Dynamics (GLaD): combined analysis to unveil properties of high-redshift galaxies
Halkola, A.; Suyu, S. H.; Yıldırım, A. +1 more
The dynamical modelling of integral field unit (IFU) stellar kinematics is a powerful tool to unveil the dynamical structure and mass build-up of galaxies in the local Universe, while gravitational lensing is nature's cosmic telescope to explore the properties of galaxies beyond the local Universe. We present a new approach, which unifies dynamica…
The contribution of quasar absorption outflows to AGN feedback
Xu, Xinfeng; Kriss, Gerard A.; Arav, Nahum +1 more
Determining the distance of quasar absorption outflows from the central source (R) and their kinetic luminosity ($\dot{E}_\mathrm{\scriptstyle k}$) is crucial for understanding their contribution to active galactic nucleus (AGN) feedback. Here, we summarize the results for a sample of nine luminous quasars that were observed with the Hubble Space …
Extended main sequence turnoffs in open clusters as seen by Gaia - II. The enigma of NGC 2509
Cabrera-Ziri, I.; Usher, C.; Bastian, N. +6 more
We investigate the morphology of the colour-magnitude diagram (CMD) of the open cluster NGC 2509 in comparison with other Galactic open clusters of similar age using Gaia photometry. At ∼900 {Myr} Galactic open clusters in our sample all show an extended main sequence turnoff (eMSTO) with the exception of NGC 2509, which presents an exceptionally …
XMM-Newton observations of eleven intermediate polars and possible candidates
Mukai, K.; Schwope, A. D.; Traulsen, I. +2 more
Aims: We aim to identify new intermediate polars (IPs) in XMM-Newton observations from a list of promising candidates. By selecting targets not previously known to be X-ray bright, we aim to uncover evidence for an X-ray underluminous IP subpopulation.
Methods: We performed period searches on the XMM-Newton X-ray and optical data of our …
A comprehensive investigation of the variable overcontact system EH Cancri
Nelson, Robert H.; Alton, Kevin B.; StÈ©pień, Kazimierz
Precise multi-color CCD-derived photometric data were obtained from EH Cnc at two sites during 2010, 2014 and 2018 wherein each epoch used a different instrument. This has provided a unique opportunity to investigate parameter uncertainty following Roche modeling of light curves optimized by differential corrections using the Wilson–Devinney code.…
Galaxy and Mass Assembly: A Comparison between Galaxy-Galaxy Lens Searches in KiDS/GAMA
Holwerda, Benne W.; Hopkins, Andrew M.; Bilicki, Maciej +9 more
Strong gravitational lenses are a rare and instructive type of astronomical object. Identification has long relied on serendipity, but different strategies—such as mixed spectroscopy of multiple galaxies along the line of sight, machine-learning algorithms, and citizen science—have been employed to identify these objects as new imaging surveys bec…
Observations and numerical modelling of a convective disturbance in a large-scale cyclone in Jupiter's South Temperate Belt
Hansen, C. J.; Hueso, R.; Sánchez-Lavega, A. +8 more
Moist convective storms in Jupiter develop frequently and can trigger atmospheric activity of different scales, from localized storms to planetary-scale disturbances including convective activity confined inside a larger meteorological system. In February 2018 a series of convective storms erupted in Jupiter's South Temperate Belt (STB) (planetoce…
Electric Current Evolution at the Footpoints of Solar Eruptions
Barczynski, Krzysztof; Aulanier, Guillaume; Janvier, Miho +2 more
Electric currents play a critical role in the triggering of solar flares and their evolution. The aim of the present paper is to test whether the surface electric current has a surface or subsurface fixed source as predicted by the circuit approach of flare physics, or is the response of the surface magnetic field to the evolution of the coronal m…
Constraints on the spin-pole orientation, jet morphology, and rotation of interstellar comet 2I/Borisov with deep HST imaging
Lisse, Carey M.; Bolin, Bryce T.
We present high resolution, deep imaging of interstellar comet 2I/Borisov taken with the Hubble Space Telescope/Wide Field Camera 3 (HST/WFC3) on 2019 December 8 UTC and 2020 January 27 UTC (HST GO 16040, PI: Bolin) before and after its perihelion passage in combination with HST/WFC3 images taken on 2019 October 12 UTC and 2019 November 16 UTC (HS…
Microlensing Analysis for the Gravitational Lens Systems SDSS0924+0219, Q1355-2257, and SDSS1029+2623
Mediavilla, E.; Rojas, K.; Fian, C. +3 more
We use spectroscopic observations of the gravitationally lensed systems SDSS0924+0219(BC), Q1355-2257(AB), and SDSS1029+2623(BC) to analyze microlensing and dust extinction in the observed components. We detect chromatic microlensing effects in the continuum and microlensing in the broad emission line profiles of the systems SDSS0924+0219(BC) and …