Results 91 to 100 of about 176,075 (225)
Deep Learning Segmentation of Spiral Arms and Bars [PDF]
arXiv, 2023 We present the first deep learning model for segmenting galactic spiral arms and bars. In a blinded assessment by expert astronomers, our predicted spiral arm masks are preferred over both current automated methods (99% of evaluations) and our original volunteer labels (79% of evaluations).
arxiv
Fortschritte der Physik, Volume 73, Issue 3, March 2025.Abstract Current observations show that a significant fraction of the Universe is composed of dark energy and dark matter. In this paper, the simultaneous effects of these dark sectors on the Euler–Heisenberg black hole are investigated, using the quintessence matter field and perfect fluid to model them. In particular, the black hole's thermodynamics,
Bilel Hamil, Bekir Can Lütfüoğlu
wiley +1 more source
Unstable Bar and Spiral Modes of Disk Galaxies [PDF]
The Astrophysical Journal, 2005 Submitted to the Astrophysical ...
Mir Abbas Jalali, C. Hunter
openaire +3 more sources
Star Formation Properties in Barred Galaxies(SFB). III. Statistical Study of Bar-driven Secular Evolution using a sample of nearby barred spirals [PDF]
, 2014 Stellar bars are important internal drivers of secular evolution in disk galaxies. Using a sample of nearby spiral galaxies with weak and strong bars, we explore the relationships between the star formation feature and stellar bars in galaxies. We find that galaxies with weak bars tend to be coincide with low concentrical star formation activity, while
arxiv +1 more source
CO in the Disk of the Barred Spiral Galaxy M83: CO (1-0), CO (2-1), and Neutral Gas
, 2002 We present "on-the-fly" maps of CO (1–0) and CO (2–1) in the barred spiral galaxy M83. The entire optical disk is filled with CO emission in both lines, including interarm regions.
L. P. Crosthwaite +4 more
semanticscholar +1 more source
Hydrodynamical Simulations of the Barred Spiral Galaxy NGC 6782 [PDF]
, 2006 NGC 6782 is an early-type barred spiral galaxy exhibiting a rich and complex morphology with multiple ring patterns. To provide a physical understanding of its structure and kinematical properties, two-dimensional hydrodynamical simulations have been ...
Lien-Hsuan Lin, C. Yuan, R. Buta
semanticscholar +1 more source
Journal of Geophysical Research: Planets, Volume 130, Issue 3, March 2025.Abstract As part of the Apollo Next‐Generation Sample Analysis (ANGSA) program, we provide bulk composition, mineralogy, petrology, and noble gas assays of lunar particles and soils from the top half of the 73001/2 double‐drive tube (i.e., 73002) studied by the ANGSA consortium.
Barbara A. Cohen +7 more
wiley +1 more source
What determines the sizes of bars in spiral galaxies? [PDF]
Monthly Notices of the Royal Astronomical Society, 2019 ABSTRACT I use volume- and mass-limited subsamples and recently published data from the Spitzer Survey of Stellar Structure in Galaxies (S4G) to investigate how the size of bars depends on galaxy properties. The known correlation between bar semimajor axis a and galaxy stellar mass (or luminosity) is actually bimodal: for $\log \, (M_ ...
openaire +2 more sources
Rings and spirals in barred galaxies â II. Ring and spiral morphology [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 15 pages, 11 figures, accepted for publication in ...
E. Athanassoula +4 more
openaire +3 more sources
Bar Fraction in Early- and Late-type Spirals [PDF]
, 2019 Bar fractions depend on the properties of the host galaxies, which are closely related to the formation and evolution of bars. However, observational studies do not provide consistent results. We investigate the bar fraction and its dependence on the properties of the host galaxies by using three bar classification methods: visual inspection, ellipse ...
arxiv +1 more source