Results 61 to 70 of about 176,075 (225)
The Astrophysical Journal, 2023 We present a detailed analysis of the structure of the Local Group flocculent spiral galaxy M33, as measured using the Panchromatic Hubble Andromeda Treasury Triangulum Extended Region (PHATTER) survey. Leveraging the multiwavelength coverage of PHATTER,
Adam Smercina +16 more
doaj +1 more source
Spiral arm formation mechanisms: Spiral Structure in Barred galaxies. Observational constraints to spiral arm formation mechanisms [PDF]
MNRAS, 2019, 482, 5362, 2019 A method which we have developed for determining corotation radii, has allowed us to map in detail the radial resonant structures of barred spiral galaxies. Here we have combined this information with new determinations of the bar strength and the pitch angle of the innermost segment of the spiral arms to find relationships between these parameters of ...
arxiv +1 more source
Surface Brighteness Distribrtion of NGC 7755 [PDF]
Journal of Astronomy and Space Sciences, 1992 Isophote map and luminosity profile of the barred spiral galaxy NGC 7755 are obtained from PDS scanning of PAL 0-471 plate. From the isophote map, NGC 7755 can be classified SBbc(r) with asymmetric bar ring. We get several physical parameters (MTo U(R)CB,
Mun-Suk Chun, Seong-Min Sohn
doaj
International Journal of Engineering and Management Sciences, 2018 Recently, it has been suggested that entangled particles may be connected by a wormhole. If that is right, what is the distance between them we have to take into account when applying Newton's law of universal gravitation to these particles?
Sándor Buglyó
doaj +1 more source
A Technique for Separating the Gravitational Torques of Bars and Spirals in Disk Galaxies [PDF]
Astron.J. 126 (2003) 1148, 2003 We describe a Fourier-based method of separating bars from spirals in near-infrared images. The method takes advantage of the fact that a bar is typically a feature with a relatively fixed position angle, and uses the simple assumption that the relative Fourier amplitudes due to the bar decline with radius past a maximum in the same or a similar manner
arxiv +1 more source
The shapes of spiral arms in the S$^4$G survey and their connection with stellar bars [PDF]
A&A 631, A94 (2019), 2019 Spiral galaxies are common in the local Universe, but their formation, evolution, and interplay with bars remain poorly understood. We use a sample of 391 nearby galaxies from the S$^4$G survey to characterise the winding angle and amplitude of spiral arms as a function of disc properties, such as bar strength, in all kinds of spirals (grand-design ...
arxiv +1 more source
Dense Molecular Gas Associated with the Circumnuclear Star-forming Ring in the Barred Spiral Galaxy NGC 6951 [PDF]
, 1998 We present high-resolution (3''-5'') observations of CO (1-0) and HCN (1-0) emission from the circumnuclear star-forming ring in the barred spiral galaxy NGC 6951, a host of a type 2 Seyfert nucleus, using the Nobeyama Millimeter Array and the Nobeyama ...
K. Kohno, R. Kawabe, B. Vila-Vilaro
semanticscholar +1 more source
Diffusion in barred-spiral galaxies
, 2010 We characterize the radial migration of stars in the disk plane by calculating the diffusion coefficient and the diffusion time-scale for a bulge-disk N-body self-consistent system with a marginally-stable Toomre-Q parameter. We find that diffusion is not constant in time, but follows the evolution of the bar, and becomes maximum near the corotation ...
Brunetti, Maura +2 more
openaire +3 more sources
Short-term dynamical evolution of grand-design spirals in barred galaxies [PDF]
, 2015 We investigate the short-term dynamical evolution of stellar grand-design spiral arms in barred spiral galaxies using a three-dimensional (3D) $N$-body/hydrodynamic simulation. Similar to previous numerical simulations of unbarred, multiple-arm spirals, we find that grand-design spiral arms in barred galaxies are not stationary, but rather dynamic ...
arxiv +1 more source
ASTE CO (3-2) Observations of the Barred Spiral Galaxy M 83: I. Correlation between CO (3-2)/ CO (1-0) Ratios and Star Formation Efficiencies [PDF]
, 2007 We present CO (J = 3–2) emission observations with the ASTE toward the 50 50 (or 6.6 kpc 6.6 kpc at the distance D = 4.5 Mpc) region of the nearby barred spiral galaxy M 83.
K. Muraoka +16 more
semanticscholar +1 more source