Results 21 to 30 of about 1,589,274 (291)

Universal Upper End of the Stellar Initial Mass Function in the Young and Compact LEGUS Clusters

The Astrophysical Journal, 2023
We investigate the variation in the upper end of the stellar initial mass function (uIMF) in 375 young and compact star clusters in five nearby galaxies within ∼5 Mpc. All the young stellar clusters (YSCs) in the sample have ages ≲ 4 Myr and masses above
Dooseok Escher Jung, Daniela Calzetti, Matteo Messa, Mark Heyer, Mattia Sirressi, Sean T. Linden, Angela Adamo, Rupali Chandar, Michele Cignoni, David O. Cook, Clare L. Dobbs, Bruce G. Elmegreen, Aaron S. Evans, Michele Fumagalli, John S. Gallagher III, Deidre A. Hunter, Kelsey E. Johnson, Robert C. Kennicutt Jr., Mark R. Krumholz, Daniel Schaerer, Elena Sabbi, Linda J. Smith, Monica Tosi, Aida Wofford   +23 more
doaj   +1 more source

The initial-final mass relationship of white dwarfs revisited: effect on the luminosity function and mass distribution [PDF]

, 2008
The initial-final mass relationship connects the mass of a white dwarf with the mass of its progenitor in the main-sequence. Although this function is of fundamental importance to several fields in modern astrophysics, it is not well constrained either from the theoretical or the observational points of view.
arxiv   +1 more source

The Initial Properties of Young Star Clusters in M83 [PDF]

, 2020
The initial sizes and masses of massive star clusters provide information about the cluster formation process and also determine how cluster populations are modified and destroyed, which have implications for using clusters as tracers of galaxy assembly.
arxiv   +1 more source

Constraining the Initial Mass Function in the Epoch of Reionization from Astrophysical and Cosmological Data

Universe
We aim to constrain the stellar initial mass function (IMF) during the epoch of reionization. To this purpose, we build up a semi-empirical model for the reionization history of the Universe based on various ingredients: the latest determination of the ...
Andrea Lapi, Giovanni Gandolfi, Lumen Boco, Francesco Gabrielli, Marcella Massardi, Balakrishna S. Haridasu, Carlo Baccigalupi, Alessandro Bressan, Luigi Danese   +8 more
doaj   +1 more source

High Mass Star Formation. II. The Mass Function of Submillimeter Clumps in M17 [PDF]

Astrophys.J. 644 (2006) 990-1005, 2006
We have mapped an approximately 5.5 by 5.5 pc portion of the M17 massive star-forming region in both 850 and 450 micron dust continuum emission using the Submillimeter Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT). The maps reveal more than 100 dusty clumps with deconvolved linear sizes of 0.05--0.2 pc and masses of 0 ...
arxiv   +1 more source

Making tau amyloid models in vitro: a crucial and underestimated challenge

FEBS Letters, EarlyView.
This review highlights the challenges of producing in vitro amyloid assemblies of the tau protein. We review how accurately the existing protocols mimic tau deposits found in the brain of patients affected with tauopathies. We discuss the important properties that should be considered when forming amyloids and the benchmarks that should be used to ...
Julien Broc, Clara Piersson, Yann Fichou
wiley   +1 more source

Fragmentation in Massive Star Formation [PDF]

Science 303 (2004) 1167-1169, 2004
Studies of evolved massive stars indicate that they form in a clustered mode. During the earliest evolutionary stages, these regions are embedded within their natal cores. Here, we show high-spatial-resolution interferometric dust continuum observations disentangling the cluster-like structure of a young massive star-forming region.
arxiv   +1 more source

The solution supramolecular structure of α2 → 8 polysialic acid suggests a structural cause for its low immunogenicity

FEBS Letters, EarlyView.
α2 → 8 polysialic acid elicits poor immunogenicity. Small‐angle scattering shows a supramolecular structure with parallel‐chain binding, although in different forms at μm and mm calcium. The major histocompatibility complex requires molecular weights around 2000 Da to produce antibodies, and 2000 Da polysialic oligomers will bind in these structures ...
Kenneth A. Rubinson
wiley   +1 more source

Semi‐supervised classification of fundus images combined with CNN and GCN

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose Diabetic retinopathy (DR) is one of the most serious complications of diabetes, which is a kind of fundus lesion with specific changes. Early diagnosis of DR can effectively reduce the visual damage caused by DR. Due to the variety and different morphology of DR lesions, automatic classification of fundus images in mass screening can ...
Sixu Duan, Pu Huang, Min Chen, Ting Wang, Xiaolei Sun, Meirong Chen, Xueyuan Dong, Zekun Jiang, Dengwang Li   +8 more
wiley   +1 more source

The Earliest Stage of Galactic Star Formation

The Astrophysical Journal Letters, 2023
Using a recently developed technique to estimate gas temperatures ( T _SF ) in star-forming regions from large photometric surveys, we propose a diagram, analogous to the Hertzsprung–Russell diagram for individual stars, to probe the evolution of ...
Charles L. Steinhardt, Vadim Rusakov, Thomas H. Clark, Andrei Diaconu, John Forbes, Conor McPartland, Albert Sneppen, John Weaver   +7 more
doaj   +1 more source