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Generalized model-independent characterization of strong gravitational lenses VIII. Automated multiband feature detection to constrain local lens properties
Griffiths, Richard E.; Wagner, Jenny; Lin, Joyce
As established in previous papers of this series, observables in highly distorted and magnified multiple images caused by the strong gravitational lensing effect can be used to constrain the distorting properties of the gravitational lens at the image positions. If the background source is extended and contains substructure, like star forming regi…
On the Origin of the Photospheric Magnetic Field
Linton, Mark G.; Schuck, Peter W.; Knizhnik, Kalman J. +1 more
This article presents results that challenge the paradigms that (1) the convection zone is the source of the radial magnetic field in the photosphere and (2) that coronal currents are neutralized from the perspective of the photosphere. We demonstrate, using a new analysis tool applied to simulations and observations, that bare or partially dresse…
Solar wind magnetic holes can cross the bow shock and enter the magnetosheath
Raptis, Savvas; Karlsson, Tomas; Nilsson, Hans +2 more
Solar wind magnetic holes are localized depressions of the magnetic field strength, on timescales of seconds to minutes. We use Cluster multipoint measurements to identify 26 magnetic holes which are observed just upstream of the bow shock and, a short time later, downstream in the magnetosheath, thus showing that they can penetrate the bow shock …
Consistent Analysis of the AGN LF in X-Ray and MIR in the XMM-LSS Field
Clements, D. L.; Brandt, W. N.; Nyland, Kristina +9 more
The luminosity function of active galactic nuclei (AGN) probes the history of supermassive black hole assembly and growth across cosmic time. To mitigate selection biases, we present a consistent analysis of the AGN luminosity functions (LFs) derived for both X-ray and mid-infrared (MIR) selected AGN in the XMM-Large Scale Structure field. There a…
disnht: Modeling X-ray absorption from distributed column densities
Bianchi, Stefano; Ponti, Gabriele; Locatelli, Nicola
Collecting and analyzing X-ray photons over either spatial or temporal scales encompassing varying optical depth values requires knowledge about the optical depth distribution. For a sufficiently broad optical depth distribution, assuming a single column density value leads to a misleading interpretation of the source emission properties, nominall…
The Relation between Globular Cluster Systems and Supermassive Black Holes in Spiral Galaxies. III. The Link to the M •-M * Correlation
González-Lópezlira, Rosa A.; Gwyn, Stephen; Loinard, Laurent +6 more
We continue to explore the relationship between the total number of globular clusters (GCs), N GC, and the central black hole mass, M •, in spiral galaxies. We present here results for the Sab galaxies NGC 3368, NGC 4736 (M94), and NGC 4826 (M64), and the Sm galaxy NGC 4395. The GC candidate selection is based on the (u* - $i…
Observation and origin of non-thermal hard X-rays from Jupiter
Mori, Kaya; Branduardi-Raymont, Graziella; Nynka, Melania +10 more
Electrons accelerated on Earth by a rich variety of wave-scattering or stochastic processes1,2 generate hard, non-thermal X-ray bremsstrahlung up to ~1 MeV (refs. 3,4) and power Earth's various types of aurorae. Although Jupiter's magnetic field is an order of magnitude larger than Earth's, space-based telescopes have previou…
Important stellar perturbers found during the StePPeD database update based on Gaia EDR3 data
Dybczyński, Piotr A.; Berski, Filip; Tokarek, Jakub +3 more
Context. In 2020, the initial version of the Stellar Potential Perturbers Database (StePPeD) was presented with the aim to deliver up-to-date information on the stars and stellar systems that may perturb a long-period comet motion. We used the minimal distance between a star and the Sun as a selecting tool when compiling a list of interesting obje…
Extra-tidal star candidates in globular clusters of the Sagittarius dwarf spheroidal galaxy
Carballo-Bello, Julio A.; Minniti, Dante; Fernández-Trincado, José G. +4 more
Context. Globular clusters (GCs) associated with the Sagittarius dwarf spheroidal galaxy (Sgr dSph) have evolved under the gravitational potential of both Sgr dSph and the Milky Way. The effects of these potentials are most pronounced in the extra-tidal regions as compared to the central regions of the GCs.
Aims: We aim to study the extra-tid…
Radio emission in a nearby, ultra-cool dwarf binary: A multifrequency study
Rebolo, R.; Béjar, V. J. S.; Zapatero Osorio, M. R. +8 more
Context. The substellar triple system VHS J125601.92−125723.9 (hereafter VHS 1256−1257) is composed of an equal-mass M7.5 brown dwarf binary and an L7 low-mass substellar object. In Guirado et al. (2018, A&A, 610, A23) we published the detection of radio emission at 8.4 GHz coming from the central binary and making it an excellent target for f…