Results 21 to 30 of about 455,148 (185)

Nuclear stellar disks in spiral galaxies [PDF]

, 2002
We report the discovery of a nuclear stellar disk in 3 early-type spirals, namely NGC 1425, NGC 3898 and NGC 4698, revealed by WFPC2/F606W images out of a sample of 38 spiral galaxies, selected from the HST Data Archive.
PIZZELLA, ALESSANDRO, BERTOLA, FRANCESCO, SARZI, MARC, STIAVELLI M., SCARLATA C., CORSINI, ENRICO MARIA, MORELLI, LORENZO, M. Sarzi, L. Morelli, E. M. Corsini, M. Stiavelli, A. Pizzella, C. Scarlata, F. Bertola   +13 more
core   +1 more source

Hydrodynamical simulations of the barred spiral galaxy NGC 1097 [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractNGC 1097 is a nearby barred spiral galaxy believed to be interacting with the elliptical galaxy NGC 1097A located to its northwest. It hosts a Seyfert 1 nucleus surrounded by a circumnuclear starburst ring. Two straight dust lanes connected to the ring extend almost continuously out to the bar.
Lin, Lien-Hsuan, Wang, Hsiang-Hsu, Hsieh, Pei-Ying, Taam, Ronald E., Yang, Chao-Chin, Yen, David C. C.   +5 more
openaire   +3 more sources

Comparison of physical characteristics of mass and luminosity function of disk systems in barred and unbarred spiral galaxies

مجلة بغداد للعلوم
Among the most important ways to investigate galaxies' distribution over cosmic time is the luminosity function LF in terms of baryonic disc mass ψS(Mb), magnitude  .
Al Najm M.N., Y. E. Rashed , H. H. AL-Dahlaki   +2 more
doaj   +1 more source

PHANGS–JWST First Results: Interstellar Medium Structure on the Turbulent Jeans Scale in Four Disk Galaxies Observed by JWST and the Atacama Large Millimeter/submillimeter Array

The Astrophysical Journal Letters, 2023
JWST/Mid-Infrared Instrument imaging of the nearby galaxies IC 5332, NGC 628, NGC 1365, and NGC 7496 from PHANGS reveals a richness of gas structures that in each case form a quasi-regular network of interconnected filaments, shells, and voids.
Sharon E. Meidt, Erik Rosolowsky, Jiayi Sun, Eric W. Koch, Ralf S. Klessen, Adam K. Leroy, Eva Schinnerer, Ashley. T. Barnes, Simon C. O. Glover, Janice C. Lee, Arjen van der Wel, Elizabeth J. Watkins, Thomas G. Williams, F. Bigiel, Médéric Boquien, Guillermo A. Blanc, Yixian Cao, Mélanie Chevance, Daniel A. Dale, Oleg V. Egorov, Eric Emsellem, Kathryn Grasha, Jonathan D. Henshaw, J. M. Diederik Kruijssen, Kirsten L. Larson, Daizhong Liu, Eric J. Murphy, Jérôme Pety, Miguel Querejeta, Toshiki Saito, Karin M. Sandstrom, Rowan J. Smith, Mattia C. Sormani, David A. Thilker   +33 more
doaj   +1 more source

Formation of Major Types of Galaxies Based on the Energy Circulation Theory

Reports in Advances of Physical Sciences, 2022
The standard cosmology can answer almost nothing about how the structure of a galaxy is formed. It expects a supermassive black hole at the center and dark matter in the halo to explain the circulation of stars and its velocity.
Shigeto Nagao
doaj   +1 more source

Story2Board: A Training‐Free Approach for Expressive Visual Storytelling

Computer Graphics Forum, EarlyView.
Abstract We present Story2Board, a training‐free framework for expressive storyboard generation from natural language. Existing methods narrowly focus on subject identity, overlooking key aspects of visual storytelling such as spatial composition, background evolution, and narrative pacing.
D. Dinkevich, M. Levy, O. Avrahami, D. Samuel, D. Lischinski   +4 more
wiley   +1 more source

Regulation by the Transcriptional Regulator YdcI in E. coli and (p)ppGpp‐Dependent Activation of ydcI Expression

Molecular Microbiology, Volume 126, Issue 5, Page 503-518, November 2026.
YdcI, a LysR‐type transcription regulator in Escherichia coli, regulates loci like iraP and mqo. Its expression is induced by (p)ppGpp under stress conditions, and protein levels rise during mid‐exponential growth, connecting its role to stress response and metabolism control. ABSTRACT YdcI, a LysR‐type transcription regulator, has been associated with
Ria Basu Roy, Karin Schnetz
wiley   +1 more source

Invariant manifolds and the response of spiral arms in barred galaxies

, 2008
The unstable invariant manifolds of the short-period family of periodic orbits around the unstable Lagrangian points L1 and L2 of a barred galaxy define loci in the configuration space, which take the form of a trailing spiral pattern.
G. Contopoulos, P. Tsoutsis, C. Efthymiopoulos, C. Kalapotharakos   +3 more
core   +1 more source

Active galactic nucleus activity in nearby disk galaxies: The roles of bar strength and spiral arm morphology

Astronomy & Astrophysics
Context. The transport of gas toward galactic centers and its connection to active galactic nucleus (AGN) activity remain key open questions in galaxy evolution.
Martirosyan Zh. R., Hakobyan A. A., Adibekyan V., Barkhudaryan L. V., Gevorgyan M. H., Karapetyan A. G.   +5 more
doaj   +1 more source

PHANGS–JWST First Results: Rapid Evolution of Star Formation in the Central Molecular Gas Ring of NGC 1365

The Astrophysical Journal Letters, 2023
Large-scale bars can fuel galaxy centers with molecular gas, often leading to the development of dense ringlike structures where intense star formation occurs, forming a very different environment compared to galactic disks.
Eva Schinnerer, Eric Emsellem, Jonathan D. Henshaw, Daizhong Liu, Sharon E. Meidt, Miguel Querejeta, Florent Renaud, Mattia C. Sormani, Jiayi Sun, Oleg V. Egorov, Kirsten L. Larson, Adam K. Leroy, Erik Rosolowsky, Karin M. Sandstrom, T. G. Williams, Ashley. T. Barnes, F. Bigiel, Mélanie Chevance, Yixian Cao, Rupali Chandar, Daniel A. Dale, Cosima Eibensteiner, Simon C. O. Glover, Kathryn Grasha, Stephen Hannon, Hamid Hassani, Jaeyeon Kim, Ralf S. Klessen, J. M. Diederik Kruijssen, Eric J. Murphy, Justus Neumann, Hsi-An Pan, Jérôme Pety, Toshiki Saito, Sophia K. Stuber, Robin G. Treß, Antonio Usero, Elizabeth J. Watkins, Bradley C. Whitmore, PHANGS   +39 more
doaj   +1 more source