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The IACOB project. XI. No increase in mass-loss rates over the bistability region
Simón-Díaz, S.; Urbaneja, M. A.; de Burgos, A. +1 more
The properties of blue supergiants are key for constraining the end of the main sequence (MS) of massive stars. Whether the observed drop in the relative number of fast-rotating stars below ≈21 kK is due to enhanced mass-loss rates at the location of the bistability jump, or the result of the end of the MS is still debated. Here, we combine newly …
First Observational Evidence for an Interconnected Evolution between Time Lag and QPO Frequency among AGNs
Liu, Hao; Xue, Yongquan; Xia, Ruisong
Quasiperiodic oscillations (QPOs) have been widely observed in black hole X-ray binaries (BHBs), which often exhibit significant X-ray variations. Extensive research has explored the long-term evolution of the properties of QPOs in BHBs. In contrast, such evolution in active galactic nuclei (AGNs) has remained largely unexplored due to limited obs…
SMA Detection of an Extreme Millimeter Flare from the Young Class III Star HD 283572
Wilner, David J.; Rao, Ramprasad; Andrews, Sean M. +5 more
We present evidence of variable 1.3 mm emission from the 1 to 3 Myr, spectral-type G2–G5 class III young stellar object (YSO), HD 283572. HD 283572 was observed on eight dates with the Submillimeter Array between 2021 December and 2023 May, with a total on-source time of 10.2 hr, probing a range of timescales down to 5.2 s. Averaging all data obta…
TOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization
Nagel, E.; Amado, P. J.; Caballero, J. A. +47 more
We report the confirmation and mass determination of a mini-Neptune transiting the M3.5 V star TOI-4438 (G 182-34) every 7.44 days. A transit signal was detected with NASA's TESS space mission in the sectors 40, 52, and 53. In order to validate the planet TOI-4438 b and to determine the system properties, we combined TESS data with high-precision …
OGLE-2023-BLG-0836L: The sixth microlensing planet in a binary stellar system
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +32 more
Aims: Light curves of microlensing events occasionally deviate from the smooth and symmetric form of a single-lens single-source event. While most of these anomalous events can be accounted for by employing a binary-lens single-source (2L 1S) or a single-lens binary-source (1L2S) framework, it is established that a small fraction of events re…
The VLBA CANDELS GOODS-North Survey. II - Wide-field source catalogue comparison between the VLBA, EVN, e-MERLIN, and VLA
Muxlow, T. W. B.; Thomson, A. P.; Garrett, M. A. +5 more
Deep radio surveys of extragalactic legacy fields trace a large range of spatial and brightness temperature sensitivity scales, and therefore have differing biases to radio-emitting physical components within galaxies. This is particularly true of radio surveys performed at $\lesssim 1 \ \mathrm{arcsec}$ angular resolutions, and so robust comparis…
A new method for short-duration transient detection in radio images: searching for transient sources in MeerKAT data of NGC 5068
Wijers, R. A. M. J.; Fender, R.; Woudt, P. A. +12 more
Transient surveys are a vital tool in exploring the dynamic Universe, with radio transients acting as beacons for explosive and highly energetic astrophysical phenomena. However, performing commensal transient surveys using radio imaging can require a significant amount of computing power, data storage, and time. With the instrumentation available…
All-sky three-dimensional dust density and extinction Maps of the Milky Way out to 2.8 kpc
Bailer-Jones, C. A. L.; Fouesneau, M.; Dharmawardena, T. E. +5 more
Three-dimensional dust density maps are crucial for understanding the structure of the interstellar medium of the Milky Way and the processes that shape it. However, constructing these maps requires large data sets and the methods used to analyse them are computationally expensive and difficult to scale up. As a result, it has only recently become…
The Fate of the Interstellar Medium in Early-type Galaxies. III. The Mechanism of Interstellar Medium Removal and the Quenching of Star Formation
Frayer, D. T.; Hughes, D. H.; Zavala, J. +15 more
Understanding how galaxies quench their star formation is crucial for studies of galaxy evolution. Quenching is related to a decrease of cold gas. In the first paper we showed that the dust removal timescale in early-type galaxies (ETGs) is about 2.5 Gyr. Here we present carbon monoxide and 21 cm hydrogen line observations of these galaxies and me…
The accretion history of the Milky Way: III. Hydrodynamical simulations of Galactic dwarf galaxies at first infall
Hammer, Francois; Mamon, Gary A.; Pawlowski, Marcel S. +3 more
Most Milky Way dwarf galaxies are much less bound to their host than are relics of Gaia-Sausage-Enceladus and Sgr. These dwarfs are expected to have fallen into the Galactic halo less than 3 Gyr ago, and will therefore have undergone no more than one full orbit. Here, we have performed hydrodynamical simulations of this process, assuming that thei…