Results 101 to 110 of about 30,211 (248)

The Impacts of Bars, Spirals, and Bulge Size on Gas-phase Metallicity Gradients in MaNGA Galaxies

The Astrophysical Journal
As galaxies evolve over time, the orbits of their constituent stars are expected to change in size and shape, moving stars away from their birth radius. Radial gas flows are also expected. Spiral arms and bars in galaxies are predicted to help drive this
M. E. Wisz, Karen L. Masters, Kathryne J. Daniel, David V. Stark, Francesco Belfiore   +4 more
doaj   +1 more source

Statistical Study of the Star Formation Efficiency in Bars: Is Star Formation Suppressed in Gas-rich Bars?

The Astrophysical Journal, 2023
The dependence of the star formation efficiency (SFE) on galactic structures—especially whether the SFE in the bar region is lower than those in other regions—has recently been debated. We report the SFEs of 18 nearby gas-rich massive star-forming barred
Fumiya Maeda, Fumi Egusa, Kouji Ohta, Yusuke Fujimoto, Asao Habe   +4 more
doaj   +1 more source

The HST/ACS Coma Cluster Survey. VIII. Barred Disk Galaxies In The Core Of The Coma Cluster [PDF]

, 2012
We use high-resolution (similar to 0.'' 1) F814W Advanced Camera for Surveys (ACS) images from the Hubble Space Telescope ACS Treasury survey of the Coma cluster at z similar to 0.02 to study bars in massive disk galaxies (S0s), as well as low-mass dwarf
Balcells, Marc, Carter, David, den Brok, Mark, Erwin, Peter, Ferguson, Henry C., Goudfrooij, Paul, Graham, Alister W., Guzman, Rafael, Hammer, Derek, Hoyos, Carlos, Jogee, Shardha, Kleijn, Gus V., Marinova, Irina, Mobasher, Bahram, Mouhcine, Mustapha, Peletier, Reynier F., Peng, Eric W., Trentham, Neil, Weinzirl, Tim   +18 more
core   +2 more sources

Characterization of Pilin A and Thioredoxin A Mutant Strains of Acinetobacter baumannii, From a Transposon Insertion Library, for Pili Production and Virulence‐Associated Properties

MicrobiologyOpen, Volume 14, Issue 6, December 2025.
Acinetobacter baumannii transposon insertion mutant strains ΔpilA and ΔtrxA display marked reductions of surface pili. The PilA (a major pilin protein) and TrxA (thioredoxin A) deficient bacteria also show attenuation in pathogenesis including the reduction of intestinal bacterial attachment, increased phagocytic uptake and decreased mortality from ...
Jadelynn Aki, Sara B. Papp, Bayley Polk, Sean Jeffreys, Megan P. Tompkins, Anwar A. Kalalah, Mark Eppinger, Guoquan Zhang, M. N. Guentzel, James P. Chambers, Bernard P. Arulanandam, Jieh‐Juen Yu   +11 more
wiley   +1 more source

Dark Gaps and Resonances in Barred Galaxies

The Astrophysical Journal
Dark gaps, low surface brightness regions along the bar minor axis, are expected to form as a consequence of secular evolution in barred galaxies. Although several studies have proposed links between dark gap locations and dynamical resonances, the ...
Taehyun Kim, Dimitri A. Gadotti, Myeong-gu Park, Yun Hee Lee, Francesca Fragkoudi, Minjin Kim, Woong-Tae Kim   +6 more
doaj   +1 more source

Photometric structure of the peculiar galaxy ESO 235-G58

, 2004
We present the near-infrared and optical properties of the peculiar galaxy ESO 235-G58, which resembles a late-type ringed barred spiral seen close to face-on.
Arnaboldi, Arnaboldi, Athanassoula, Bell, Bothun, Bothun, Bournaud, Bruzual, Buta, Buta, Buta, Cardelli, de Jong, de Jong, E. Iodice, Erwin, Iodice, Iodice, Iodice, Iodice, Iodice, Jungwiert, K. C. Freeman, Khosroshahi, Knapen, L. S. Sparke, M. Arnaboldi, M. Capaccioli, Makarova, McGaugh, McGregor, Michard, Michard, Möllenhoff, O'Neil, R. Buta, Reshetnikov, Rieke, Salpeter, Schlegel, Scorza, van Driel, van Driel, van Driel, van Gorkom, Walterbos, Whitmore, Wozniak   +47 more
core   +1 more source

The dynamics of stellar disks in live dark-matter halos [PDF]

, 2018
Recent developments in computer hardware and software enable researchers to simulate the self-gravitating evolution of galaxies at a resolution comparable to the actual number of stars. Here we present the results of a series of such simulations.
Baba, Junichi, Bédorf, Jeroen, Fujii, Michiko S., Zwart, Simon Portegies   +3 more
core   +3 more sources

Betaine‐Conjugated ß‐Peptide Foldamers: Influence of Quaternary Charge on Self‐Organization and MorphologyFormation

ChemistryOpen, Volume 14, Issue 12, December 2025.
N‐terminal betaine conjugation modifies β‐peptide helices, influencing folding and self‐organization. For [1S, 2S]‐ACPC, folding to an H12 helix was unaffected, while [1R, 2R]‐ACHC formed an H14 helix instead of H10. Alternating heterochiral oligomers made of enantiomeric pairs of trans‐ACPC showed enhanced solubility and E‐strand formation.
Nikolett Varró, Eszter Erdei, Dóra Bogdán, Eszter Kalydi, Ruth Deme, Balázs Balogh, Imola Cs. Szigyártó, Tamás Beke‐Somfai, Zoltán Varga, Pál Szabó, István M. Mándity   +10 more
wiley   +1 more source

Conditions for Bar Formation in Bulgeless Disk Galaxies

The Astrophysical Journal
While bars are commonly observed in disk galaxies, the precise conditions governing their formation remain incompletely understood. To investigate these conditions, we perform a suite of N -body simulations of bulgeless disk galaxies with stellar masses ...
Dajeong Jang, Woong-Tae Kim, Yun Hee Lee
doaj   +1 more source

Effects of the Central Mass Concentration on Bar Formation in Disk Galaxies

The Astrophysical Journal, 2023
While bars are common in disk galaxies, their formation conditions are not well understood. We use N -body simulations to study the formation and evolution of a bar in isolated galaxies consisting of a stellar disk, a classical bulge, and a dark halo. We
Dajeong Jang, Woong-Tae Kim
doaj   +1 more source