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The impact of stellar bars on star-formation quenching: Insights from a spatially resolved analysis in the local Universe
Bisigello, Laura; Gruppioni, Carlotta; Rodighiero, Giulia +8 more
Context. Stellar bars are common morphological structures in the local Universe; according to optical and NIR surveys, they are present in about two-thirds of disc galaxies. These elongated structures are also believed to play a crucial role in secular evolutionary processes, because they are able to efficiently redistribute gas, stars, and angula…
Constraining the overcontact phase in massive binary evolution: III. Period stability of known B+B and O+B overcontact systems
Mahy, Laurent; Abdul-Masih, Michael; Marchant, Pablo +3 more
Context. Binary systems play a crucial role in massive star evolution. Systems composed of B-type and O-type stars are of particular interest due to their potential to lead to very energetic phenomena or the merging of exotic compact objects. Aims. We aim to determine the orbital period variations of a sample of B+B and O+B massive overcontact bin…
Mitigating bias in deep learning: training unbiased models on biased data for the morphological classification of galaxies
Miller, Christopher J.; Medina-Rosales, Esteban; Cabrera-Vives, Guillermo
Galaxy morphologies and their relation with physical properties have been a relevant subject of study in the past. Most galaxy morphology catalogues have been labelled by human annotators or by machine learning models trained on human-labelled data. Human-generated labels have been shown to contain biases in terms of the observational properties o…
Structure and Color Gradients of Ultradiffuse Galaxies in Distant Massive Galaxy Clusters
Cui, Qifan; Yesuf, Hassen M.; Wu, Hong +2 more
We have measured structural parameters and radial color profiles of 108 ultradiffuse galaxies (UDGs), carefully selected from six distant massive galaxy clusters in the Hubble Frontier Fields (HFF) in a redshift range from 0.308 to 0.545. Our best-fitting GALFIT models show that the HFF UDGs have a median Sérsic index of 1.09, which is close to 0.…
On the Roles of Stellar Rotation and Binarity in NGC 2423's Main-sequence Turnoff Region
Wang, Li; Li, Chengyuan; Bu, Yutian +2 more
Research has shown that many young and intermediate-age clusters (younger than ∼2 Gyr) have extended main sequences and extended main-sequence turnoffs (eMSTOs), which cannot be adequately described by a single isochrone. The reason for the extended main sequences is now known, with the most probable cause being the fast rotation of stars. However…
Are James Webb Space Telescope Observations Consistent with Warm Dark Matter?
Hoeneisen, Bruce
We compare observed with predicted distributions of galaxy stellar masses $M_*$ and galaxy rest-frame ultra-violet luminosities per unit bandwidth $L_{UV}$, in the redshift range $z = 2$ to 13. The comparison is presented as a function of the comoving warm dark matter free-streaming cut-off wavenumber $k_{fs}$. For this comparison the theory is a …
The 2022-2023 accretion outburst of the young star V1741 Sgr
Rich, R. Michael; De, Kishalay; Fremling, Christoffer +12 more
V1741 Sgr (= SPICY 71482/Gaia22dtk) is a Classical T Tauri star on the outskirts of the Lagoon Nebula. After at least a decade of stability, in mid-2022, the optical source brightened by ~3 mag over 2 months, remained bright until early 2023, then dimmed erratically over the next 4 months. This event was monitored with optical and infrared spectro…
LoVoCCS. II. Weak Lensing Mass Distributions, Red-sequence Galaxy Distributions, and Their Alignment with the Brightest Cluster Galaxy in 58 Nearby X-Ray-luminous Galaxy Clusters
Cooper, M. C.; Donahue, Megan; Miyatake, Hironao +31 more
The Local Volume Complete Cluster Survey is an ongoing program to observe nearly a hundred low-redshift X-ray-luminous galaxy clusters (redshifts 0.03 < z < 0.12 and X-ray luminosities in the 0.1–2.4 keV band L X500c > 1044 erg s‑1) with the Dark Energy Camera, capturing data in the u, g, r, i, z bands wit…
The RAdio Galaxy Environment Reference Survey (RAGERS): Evidence of an anisotropic distribution of submillimeter galaxies in the 4C 23.56 protocluster at z = 2.48
Liu, Y.; Greve, T. R.; Kohno, K. +41 more
Context. High-redshift radio(-loud) galaxies (HzRGs) are massive galaxies with powerful radio-loud active galactic nuclei (AGNs) and serve as beacons for protocluster identification. However, the interplay between HzRGs and the large-scale environment remains unclear. Aims. To understand the connection between HzRGs and the surrounding obscured st…
Mass Assembly in Massive Star Formation: A Fragmentation Study of ATLASGAL Clumps
Wyrowski, Friedrich; Menten, Karl M.; Williams, Jonathan P. +3 more
The mass assembly in star-forming regions arises from the hierarchical structure in molecular clouds in tandem with fragmentation at different scales. In this paper, we present a study of the fragmentation of massive clumps covering a range of evolutionary states, selected from the ATLASGAL survey, using the compact configuration of the Submillime…