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Towards realistic modelling of the astrometric capabilities of MCAO systems: detecting an intermediate-mass black hole with MAVIS
Monty, Stephanie; Mendel, J. Trevor; Fiorentino, Giuliana +9 more
Accurate astrometry is a key deliverable for the next generation of multiconjugate adaptive optics (MCAO) systems. The MCAO-Assisted Visible Imager and Spectrograph (MAVIS) is being designed for the Very Large Telescope Adaptive Optics Facility and must achieve 150 $\mu$as astrometric precision (50 $\mu$as goal). To test this before going on-sky, …
Dust Temperature of Compact Star-forming Galaxies at z ∼ 1-3 in 3D-HST/CANDELS
Chen, Zuyi; Fang, Guanwen; Lin, Zesen +3 more
Recent simulation studies suggest that the compaction of star-forming galaxies (SFGs) at high redshift might be a critical process, during which the central bulge is being rapidly built, followed by quenching of the star formation. To explore dust properties of SFGs with compact morphology, we investigate the dependence of dust temperature, T…
A fundamental plane in X-ray binary activity of external galaxies
Ueda, Yoshihiro; Inoue, Yoshiyuki; Yabe, Kiyoto
We construct a new catalog of extragalactic X-ray binaries (XRBs) by matching the latest Chandra source catalog with local galaxy catalogs. Our XRB catalog contains 4430 XRBs hosted by 237 galaxies within ~130 Mpc. As XRBs dominate the X-ray activity in galaxies, the catalog enables us to study the correlations between the total X-ray luminosity o…
A search for X-ray absorbed sources in the 3XMM catalogue using photometric redshifts and Bayesian spectral fits
Georgantopoulos, I.; Corral, A.; Ruiz, A.
Since its launch in 1999, the XMM-Newton mission has compiled the largest catalogue of serendipitous X-ray sources, with the 3XMM being the third version of this catalogue. This was possible thanks to the combination of a large effective area (5000 cm2 at 1 keV) and a wide field of view (30 arcmin). The 3XMM-DR6 catalogue contains about…
The multiphase environment in the centre of Centaurus A
De Marco, B.; Migliori, G.; Różańska, A. +6 more
We study the multiphase medium in the vicinity of the active galactic nucleus Centaurus A (Cen A). Combined high-resolution observations with the Atacama Large Millimeter/submillimeter Array (ALMA) and Chandra X-ray Observatory indicate that the hot X-ray emitting plasma coexists with the warm and cold media in Cen A. This complex environment is a…
The bi-modal 7Li distribution of the Milky Way's thin-disk dwarf stars. The role of Galactic-scale events and stellar evolution
Cifuentes, C.; Roca-Fàbrega, S.; Llorente de Andrés, F. +2 more
Context. The lithium abundance, A(Li), in stellar atmospheres suffers from various enhancement and depletion processes during the star's lifetime. While several studies have demonstrated that these processes are linked to the physics of stellar formation and evolution, the role that Galactic-scale events play in the galactic A(Li) evolution is not…
Magnetohydrodynamic Turbulence in the Earth's Magnetotail from Observations and Global MHD Simulations
Lapenta, Giovanni; Goldstein, Melvyn L.; El-Alaoui, Mostafa +2 more
Magnetohydrodynamic (MHD) turbulent flows are found in the solar wind, the magnetosheath and the magnetotail plasma sheet. In this paper, we review both observational and theoretical evidence for turbulent flow in the magnetotail. MHD simulations of the global magnetosphere for southward interplanetary magnetic field (IMF) exhibit nested vortices …
Catalogue of in situ observed solar energetic electrons from ACE/EPAM instrument
Miteva, Rositsa; Samwel, Susan W.
We present the first comprehensive catalogue of in situ observed solar energetic electron (SEE) events that covers solar cycles [SCs] 23 and 24 in the energy range 103-315 keV. The electron enhancements are detected by the Electron, Proton, and Alpha Monitor - Deflected Electrons instrument [EPAM-DE] aboard the ACE spacecraft. Onset time, peak tim…
Multi-wavelength observations and modelling of a quiescent cloud LDN1512
Ysard, Nathalie; Juvela, Mika; Saajasto, Mika +2 more
Context. Light scattering at near-infrared (NIR) wavelengths has been used to study the optical properties of the interstellar dust grains, but these studies are limited by the assumptions on the strength of the radiation field. On the other hand, thermal dust emission can be used to constrain the properties of the radiation field, although this i…
Active Boulder Falls in Terra Sirenum, Mars: Constraints on Timing and Causes
Conway, Susan J.; Grindrod, Peter M.; Davis, Joel M. +1 more
We use time series images to identify significant active boulder falls in an impact crater on Mars. Evidence for active boulder falls include boulder trails with impact marks from bouncing and rolling, and dark patches from boulder impacts away from the base of the crater walls. We were able to define three time periods with active boulder falls a…