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Size Growth on Short Timescales of Star-forming Galaxies: Insights from Size Variation with Rest-frame Wavelength with JADES
Zhang, Hongxin; Kong, Xu; Li, Hui +11 more
We investigate size variation with rest-frame wavelength for star-forming galaxies based on the second James Webb Space Telescope Advanced Deep Extragalactic Survey data release. Star-forming galaxies are typically smaller at longer wavelengths from the UV to the near-IR at z < 3.5, especially for more massive galaxies, indicating the inside-ou…
An in-depth analysis of the differentially expanding star cluster Stock 18 (Villafranca O-036) using Gaia DR3 and ground-based data
Maíz Apellániz, J.; Sota, A.; Pantaleoni González, M. +4 more
Context. The Villafranca project is combining Gaia data with ground-based surveys to analyze Galactic stellar groups (clusters, associations, or parts thereof) with OB stars. Aims. We want to analyze the poorly studied cluster Stock 18 within the Villafranca project, as it is a very young stellar cluster with a symmetrical and compact H II region …
Recurring tidal disruption events a decade apart in IRAS F01004-2237
Buckley, David; Fan, Xiaohui; Gromadzki, Mariusz +16 more
Context. In theory, recurring tidal disruption events (TDEs) may occur when a close stellar binary encounters a supermassive black hole, if one star is captured and undergoes repeating partial TDEs, or if both stars are tidally disrupted (double TDEs). In addition, independent TDEs may be observed over decades in some special galaxies where the TD…
Investigating episodic mass loss in evolved massive stars: II. Physical properties of red supergiants at subsolar metallicity
Zapartas, E.; Munoz-Sanchez, G.; de Wit, S. +8 more
Mass loss during the red supergiant (RSG) phase plays a crucial role in the evolution of an intermediate-mass star; however, the underlying mechanism remains unknown. We aim to increase the sample of well-characterized RSGs at subsolar metallicity by deriving the physical properties of 127 RSGs in nine nearby southern galaxies. For each RSG, we pr…
JWST/NIRSpec and MIRI observations of an expanding, jet-driven bubble of warm H2 in the radio galaxy 3C 326 N
Petrov, R.; Nesvadba, N. P. H.; Mukherjee, D. +5 more
The physical link between AGN activity and the suppression of star formation in their host galaxies is one of the major open questions of the AGN feedback scenario. The Spitzer space mission revealed a subset of powerful nearby radio galaxies with unusually bright line emission from warm (T ≥ 100 K) molecular hydrogen, while typical star-formation…
MALS discovery of a rare H I 21 cm absorber at z ∼ 1.35: Origin of the absorbing gas in powerful active galactic nuclei
Momjian, E.; Combes, F.; Petitjean, P. +14 more
We report a new, rare detection of H I 21 cm absorption associated with a quasar (only six quasars are known at 1 < z < 2) toward J2339−5523 at zem = 1.3531, discovered through the MeerKAT Absorption Line Survey (MALS). The absorption profile is broad (∼400 km s−1 ), and the peak is redshifted by ∼200 km s−1 …
A New Enigmatic Radio Relic in the Low-mass Cluster Abell 2108
Kale, Ruta; Rahaman, Majidul; Datta, Abhirup +2 more
We report the discovery of a radio relic in the north-eastern periphery of the galaxy cluster Abell 2108 (A2108). A2108 is part of the uGMRT LOw-MAss Galaxy Cluster Survey (GLOMACS), where our main aim is to search for diffuse radio emission signatures in very sparsely explored low-mass galaxy clusters using uGMRT band-3 (central frequency 400 MHz…
TOI 762 A b and TIC 46432937 b: Two Giant Planets Transiting M-dwarf Stars
Triaud, Amaury H. M. J.; Jordán, Andrés; Brahm, Rafael +33 more
We present the discovery of TOI 762 A b and TIC 46432937 b, two giant planets transiting M-dwarf stars. Transits of both systems were first detected from observations by the NASA TESS mission, and the transiting objects are confirmed as planets through high-precision radial velocity observations carried out with Very Large Telescope/ESPRESSO. TOI …
Gaia search for (sub)stellar companions of exoplanet hosts
Mugrauer, Markus; Michel, Kai-Uwe
We conduct a survey, which explores the data releases of the European Space Agency (ESA)-Gaia mission, in order to investigate the multiplicity of exoplanet hosts at distances of less than 625 pc around the Sun. With the accurate Gaia astrometry we are able to detect stellar and substellar companions of exoplanet hosts by proving the equidistance …
The VMC survey. L. Type II Cepheids in the Magellanic Clouds: Period-luminosity relations in the near-infrared bands
Ripepi, V.; Molinaro, R.; Marconi, M. +8 more
Context. Type II Cepheids (T2Cs) are the less frequently used counterparts of classical or type I Cepheids (CCs) which provide the primary calibration of the distance ladder for measuring the Hubble constant in the local Universe. In the era of the "Hubble tension", T2C variables together with the RR Lyrae stars and the tip of the red giant branch…