Results 111 to 120 of about 8,434 (230)

Gas and Stellar Motions and Observational Signatures of Co-Rotating Spiral Arms [PDF]

, 2014
We have observed a snapshot of our N-body/Smoothed Particle Hydrodynamics simulation of a Milky Way-sized barred spiral galaxy in a similar way to how we can observe the Milky Way. The simulated galaxy shows a co-rotating spiral arm, i.e.
Cropper, Mark, Grand, Robert J. J., Hunt, Jason A. S., Kawata, Daisuke, Pasetto, Stefano   +4 more
core   +2 more sources

Search for Slow Bars in Two Barred Galaxies with Nuclear Structures: NGC 6951 and NGC 7716

The Astrophysical Journal
We investigate two barred galaxies with nuclear structures, NGC 6951 and NGC 7716, to examine whether they host slow bars. Using Gemini/GMOS long-slit spectroscopy, we calculate the bar pattern speed with the Tremaine–Weinberg method and detect ...
Yun Hee Lee, Ho Seong Hwang, Virginia Cuomo, Myeong-Gu Park, Taehyun Kim, Narae Hwang, Hong Bae Ann, Woong-Tae Kim, Hyun-Jeong Kim, Ji Yeon Seok, Jeong Hwan Lee, Yeon-Ho Choi   +11 more
doaj   +1 more source

Gas Dynamics in the Barred Seyfert Galaxy NGC4151 - II. High Resolution HI Study

, 1998
We present sensitive, high angular resolution (6" x 5") 21-cm observations of the neutral hydrogen in the nearby barred Seyfert galaxy, NGC4151. These HI observations, obtained using the VLA in B-configuration, are the highest resolution to date of this ...
A. Pedlar, A. Robinson, C. G. Mundell, D. L. Shone, SIMKIN   +4 more
core   +1 more source

Fractal basins of escape and the formation of spiral arms in a galactic potential with a bar [PDF]

, 2014
We investigate the dynamics in the close vicinity of and within the critical area in a 2D effective galactic potential with a bar of Zotos. We have calculated Poincar\'e surfaces of section and the basins of escape.
Ernst, Andreas, Peters, Thomas
core   +1 more source

Age‐Associated Decline in Autophagy Pathways in the Retinal Pigment Epithelium and Protective Effects of Topical Trehalose in Light‐Induced Outer Retinal Degeneration in Mice

Aging Cell, Volume 24, Issue 7, July 2025.
Transcriptomic analyses reveal an age‐related decline in autophagy pathways in RPE/choroid. These pathways remain unchanged in early AMD but become bidirectionally dysregulated in later stages, along with increased RPE loss. Pre‐treatment with trehalose eyedrops enhances RPE autophagy flux and prevents light‐induced outer retinal degeneration in mice ...
Katherine Cox, Gongyu Shi, Neve Read, Mohamed T. Patel, Kepeng Ou, Zijia Liu, Jiahui Wu, Suci Cendanawati, Jenna Le Brun Powell, Pola Goldberg Oppenheimer, Lisa J. Hill, Lindsay B. Nicholson, Andrew D. Dick, Jian Liu   +13 more
wiley   +1 more source

Do Strong Bars Exhibit Strong Noncircular Motions?

The Astrophysical Journal
Galactic bars induce characteristic motions deviating from pure circular rotation, known as noncircular motions. As bars are nonaxisymmetric structures, stronger bars are expected to show stronger noncircular motions.
Taehyun Kim, Dimitri A. Gadotti, Yun Hee Lee, Carlos López-Cobá, Woong-Tae Kim, Minjin Kim, Myeong-gu Park   +6 more
doaj   +1 more source

Ring Star Formation Rates in Barred and Nonbarred Galaxies

, 2010
Nonbarred ringed galaxies are relatively normal galaxies showing bright rings of star formation in spite of lacking a strong bar. This morphology is interesting because it is generally accepted that a typical ring forms when material collects near a ...
Athanassoula, Bournaud, Buta, Buta, Buta, Buta, Buta, Buta, Buta, Buta, Byrd, Combes, Contopoulos, Contopoulos, de Vaucouleurs, Donovan, E. Laurikainen, Finn, Friedli, Grouchy, Grouchy, H. Salo, Hameed, Hameed, Howarth, Kennicutt, Kohoutek, Koopmann, Madore, Mark, Martinet, McCall, R. D. Grouchy, R. J. Buta, Rautiainen, Regan, Salo, Sandage, Sandage, Schinnerer, Schwarz, Schwarz, Schwarz, Seaton, Sellwood, Shen, Sil'chenko, Tamburro, Tomita, Treuthardt, Wozniak, Wu, Wu, Yasuda, Zhang   +54 more
core   +1 more source

Plasticity of the heart in response to changes in physical activity

The Journal of Physiology, Volume 603, Issue 13, Page 3665-3677, 1 July 2025.
Abstract figure legend The heart adapts to changes in physical activity, with inactivity (e.g. bed rest or spaceflight) causing cardiac atrophy and ventricular stiffening, and endurance exercise training leading to eccentric hypertrophy and improved ventricular compliance.
Eric T. Hedge, Tiffany L. Brazile, Richard L. Hughson, Benjamin D. Levine   +3 more
wiley   +1 more source

Morphological Evolution of Disk Galaxies and Their Concentration, Asymmetry, and Clumpiness (CAS) Properties in Simulations across Toomre’s Q Parameter

The Astrophysical Journal
We investigate the morphological and structural evolution of disk galaxies in simulations for a wide range of Toomre’s Q parameters. In addition to the inspection of conventional bar modes, we compute the concentration, asymmetry, and clumpiness (CAS ...
T. Chantavat, S. Yuma, P. Malelohit, T. Worrakitpoonpon   +3 more
doaj   +1 more source

Bar-induced central star formation as revealed by integral field spectroscopy from CALIFA

, 2017
We investigate the recent star formation history (SFH) in the inner region of 57 nearly face-on spiral galaxies selected from the Calar Alto Legacy Integral Field Area (CALIFA) survey. For each galaxy we use the integral field spectroscopy from CALIFA to
He, Yanqin, Li, Cheng, Lin, Lin, Wang, Enci, Xiao, Ting   +4 more
core   +1 more source