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Multi-wavelength observations of the luminous fast blue optical transient AT 2023fhn: Up to ∼200 days post-explosion
Groot, P. J.; Levan, A. J.; Chrimes, A. A. +4 more
Context. Luminous fast blue optical transients (LFBOTs) are a class of extragalactic transients notable for their rapid rise and fade times, blue colour, and accompanying luminous X-ray and radio emission. Only a handful have been studied in detail since the prototypical example AT 2018cow. Their origins are currently unknown, but ongoing observat…
Jet formation in post-AGB binaries: Confronting cold magnetohydrodynamic disc wind models with observations
Ferreira, J.; Verhamme, O.; Van Winckel, H. +4 more
Context. Jets are launched from many classes of astrophysical objects, including post-asymptotic giant branch (post-AGB) binaries with a circumbinary disc. Despite dozens of detections, the formation of these post-AGB binary jets and their connection to the inter-component interactions in their host systems remains poorly understood. Aims. Buildin…
Variability and stellar pulsation incidence in Am and Fm stars using TESS and Gaia data
Niemczura, E.; Smalley, B.; Antoci, V. +3 more
Aims. We aim to study chemically peculiar Am and Fm stars, distinguished by their unique abundance patterns, which are crucial for studying mixing processes in intermediate-mass stars. These stars provide a window into the atomic diffusion in their stellar envelopes, the evolution-dependent changes in mixing, and the resulting effects on pulsation…
Discovery of the Goat Horn complex: a ∼1000 deg2 diffuse X-ray source connected to radio loop XII
Maitra, Chandreyee; Sasaki, Manami; Haberl, Frank +7 more
A dozen patches of polarized radio emission spanning tens of degrees in the form of coherent and stationary arcs and loops are observed at radio frequencies across the sky. Their origin is usually associated with nearby shocks, possibly arising from nearby supernova explosions. The origin of radio loop XII remains unknown. We report an anticorrela…
Mass density profiles at kiloparsec scales using the sub-millimetre galaxies magnification bias
Bonavera, L.; González-Nuevo, J.; Cueli, M. M. +2 more
Context. Gravitational lensing is a powerful tool for studying the distribution of mass in the Universe. Understanding the magnification bias effect in gravitational lensing and its impact on the flux of sub-millimetre galaxies (SMGs) is crucial for accurate interpretations of observational data.
Aims: This study aims to investigate the magni…
Age and metal gradients in massive quiescent galaxies at 0.6 ≲ z ≲ 1.0: implications for quenching and assembly histories
D'Eugenio, Francesco; van Dokkum, Pieter G.; Franx, Marijn +12 more
We present spatially resolved, simple stellar population equivalent ages, stellar metallicities, and abundance ratios for 456 massive ($10.3\lesssim \log (\mathrm{M}_*/\mathrm{M}_\odot)\lesssim 11.8$) quiescent galaxies at $0.6\lesssim z\lesssim 1.0$ from the Large Early Galaxy Astrophysics Census, derived using full-spectrum models. Typically, we…
Thermally emitting isolated neutron star candidates from the SRG/eROSITA All-Sky Survey
Haberl, F.; Pires, A. M.; Schwope, A. D. +1 more
The SRG/eROSITA All-Sky Survey (eRASS) allows for the creation of a complete sample of X-ray dim isolated neutron stars (XDINSs), which will significantly facilitate the study of their population properties, evolution, and connection to other families of isolated neutron stars (INSs). In this work, we conduct a systematic search for XDINSs on the …
Projection factor and radii of Type II Cepheids: BL Her stars
Kervella, P.; Chini, R.; Storm, J. +14 more
Context. Type II Cepheids are old pulsating stars that can be used to trace the distribution of an old stellar population and to measure distances to globular clusters and galaxies within several megaparsecs, and by extension, they can improve our understanding of the cosmic distance scale. One method that can be used to measure the distances of T…
Determining the Extents, Geometries, and Kinematics of Narrow-line Region Outflows in Nearby Seyfert Galaxies
Rafelski, Marc; Fischer, Travis C.; Crenshaw, D. Michael +5 more
Outflowing gas from supermassive black holes in the centers of active galaxies has been postulated as a major contributor to galactic evolution. To explore the interaction between narrow-line region (NLR) outflows and their host galaxies, we use Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) spectra and Wide Field Camera …
Probing a scale dependent gravitational slip with galaxy strong lensing systems
Mörtsell, Edvard; Guerrini, Sacha
Observations of galaxy-scale strong gravitational lensing systems enable unique tests of departures from general relativity at the kilo- to megaparsec scale. In this work, the gravitational slip parameter γPN, measuring the amplitude of a hypothetical fifth force, is constrained using 130 elliptical galaxy lens systems. We implement a l…