Results 21 to 30 of about 198 (153)

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

Molecular Bars in Spiral Galaxies [PDF]

International Astronomical Union Colloquium, 1996
Images of molecular gas in spiral galaxies show two types of bar structure: large-scale bars, which are correlated with the presence of stellar bars, and generally follow the spiral structure, and nuclear “bars” of a few hundred parsecs in size, which show no direct correlation with the presence of a stellar bar.
openaire   +1 more source

CO OBSERVATIONS OF BARRED SPIRAL GALAXIES [PDF]

Journal of The Korean Astronomical Society, 2006
We present the results of a highly sensitive ( mK rms) survey toward the central parts of 22 barred spiral galaxies in line using the NRAO 12m telescope at Kitt Peak. Seven of the target galaxies were detected in CO; NGC 3686 has been detected with CO for the first time. We estimated central CO fluxes of and molecular gas masses of for those galaxies.
Min-Young Lee, Chang-Won Lee, Hyo-Ryoung Kim, Myung-Hyun Rhee   +3 more
openaire   +1 more source

Asymptotic orbits in barred spiral galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2010
We study the formation of the spiral structure of barred spiral galaxies, using an $N$-body model. The evolution of this $N$-body model in the adiabatic approximation maintains a strong spiral pattern for more than 10 bar rotations. We find that this longevity of the spiral arms is mainly due to the phenomenon of stickiness of chaotic orbits close to ...
M. Harsoula, C. Kalapotharakos, G. Contopoulos   +2 more
openaire   +3 more sources

The SVP–FRO6 Module Integrates the Control of Leaf Senescence and Flowering in Arabidopsis

Plant, Cell &Environment, Volume 49, Issue 9, Page 7191-7209, September 2026.
ABSTRACT Plants coordinate major developmental transitions by integrating intrinsic genetic programs with environmental signals, where nutrient availability serves as a critical external factor shaping growth and fitness. Iron (Fe), an essential micronutrient for cellular respiration and photosynthesis, is strictly regulated through sophisticated ...
Hyunsu Park, Yeong Seon Yoon, Sanghoon Park, Ukcheol Jeong, Hyeyoung Choi, Hyunwoo Oh, Dovran Shamamedov, Zhonghai Li, Hye Ryun Woo   +8 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   +3 more sources

ALMA FACTS. III. High-resolution CO(2–1)/CO(1–0) Maps of Twelve Nearby Galaxies

The Astrophysical Journal
We present early results from a high-resolution analysis (∼100–200 pc) of the CO(2–1)/CO(1–0) line ratio in 12 nearby galaxies. We use new Atacama Large Millimeter/submillimeter Array (ALMA) CO(1–0) observations from the Fundamental CO(1–0) Transition ...
Amanda M Lee, Jin Koda, Fumi Egusa, Akihiko Hirota, Shinya Komugi, Fumiya Maeda, Tsuyoshi Sawada   +6 more
doaj   +1 more source

Normal Spiral Grand-Design Morphologies in Self-Consistent N-Body Models

Galaxies
Grand-design spiral structures typically emerge in N-body simulations of disk galaxies as barred-spiral configurations forming during the early evolutionary stages of the system.
P. A. Patsis, P. Okalidis
doaj   +1 more source

Solvent‐Guided Chiral Assemblies and Chemical Doping of OEG‐Functionalized Conjugated Polymers

Advanced Materials, Volume 38, Issue 45, 13 August 2026.
Solvent‐dependent aggregation pathways dictate whether conjugated polymers form chiral lyotropic liquid‐crystalline assemblies or achiral packed aggregates. Mapping solvent‐controlled β₁ and β2 states reveals that weaker backbone association favors β₁ aggregates and reorganizable twisted mesophases, whereas stronger backbone association favors β2 ...
Sanghyun Jeon, Justin Scott Neu, Nahyun Ahn, Ayse Senlik, Yen‐Chi Chen, Pravini S. Fernando, Priyotosh Bairagya, Chetan Kumar Prasad, Janice Mihyun Baek, Wei You, Ying Diao   +10 more
wiley   +1 more source

Discovery of a Barred-spiral Galaxy at zspec = 3.16. I. Bar Identification and Properties

The Astrophysical Journal
The formation of stellar bars is an important milestone in the secular evolution of spiral galaxies, which typically indicates the presence of a massive rotationally supported disk.
Daniel Ivanov, Mauro Giavalisco, Yingjie Cheng, Yuchen Guo, Luca Costantin, Elena D’Onghia, John R. Weaver, Shardha Jogee, Katherine E. Whitaker   +8 more
doaj   +1 more source