Results 21 to 30 of about 226,178 (344)

Vertical Density Distribution of the Galaxy from Star Count Analysis [PDF]

Journal of Astronomy and Space Sciences, 2002
The five space density distribution D(z) with distance perpendicular to the Galactic plane were combined. The scale heights and the local densities at z = 0 of the thin disk, thick disk, and the halo components were estimated from the nonlinear least ...
Young-Jong Sohn
doaj   +1 more source

On a mechanism that structures galaxies [PDF]

Symposium - International Astronomical Union, 1979
By considering the interaction of a single stellar orbit with a weak cos 2Φ potential it is shown that in the central regions of galaxies with slowly rising rotation curves, the elongations of the orbits will align along any potential valley and oscillate about it. This effect is more pronounced for elongated orbits.
openaire   +4 more sources

Some Properties of Galaxy Structures [PDF]

Open Astronomy, 2011
Abstract We analysed some properties of galaxies structures based on the PF catalog of galaxy structures (Panko & Flin 2006) and the Tully NBG catalog (Tully 1988). At first, we analyzed the orientation of galaxies in the 247 optically selected rich Abell clusters, having at least 100 members. The distribution of the position angles
Piotr Flin, Wlodzimierz Godlowski, Elena Panko, Paulina Piwowarska, Monika Biernacka   +4 more
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A new (2+1)D cluster finding algorithm based on photometric redshifts: large scale structure in the Chandra Deep Field South [PDF]

, 2006
Aims: We study galaxy clustering and explore the dependence of galaxy properties on the the environment up to a redshift z~1, on the basis of a deep multi-band survey in the Chandra Deep Field South.
A. Fontana, Abell, Arimoto, Arnaud, Bahcall, Balogh, Bell, Blakeslee, Botzler, Bower, Carlberg, Cimatti, Cimatti, Connolly, D. Trevese, De Propris, Dressler, Dressler, E. Giallongo, Fontana, Giacconi, Giallongo, Giallongo, Gilli, Girardi, Gladders, Gomez, Goto, Grazian, Heisler, Huchra, Kauffmann, Kodama, Lanzetta, Ledlow, Lumsden, M. Castellano, Menci, Mullis, Poggianti, Poli, Postman, Rosati, Schechter, Strateva, Tanaka, York   +46 more
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Dynamics of the Spiral-Arm Corotation and Its Observable Footprints in the Solar Neighborhood

Frontiers in Astronomy and Space Sciences, 2021
This article discusses the effects of the spiral-arm corotation on the stellar dynamics in the Solar Neighborhood (SN). All our results presented here rely on: (1) observational evidence that the Sun lies near the corotation circle, where stars rotate ...
Douglas A. Barros, Angeles Pérez-Villegas, Angeles Pérez-Villegas, Tatiana A. Michtchenko, Jacques R. D. Lépine   +4 more
doaj   +1 more source

Helical Structures in Seyfert Galaxies [PDF]

International Astronomical Union Colloquium, 2002
Abstract Seyfert galaxies with Z-shaped emission filaments in the Narrow Line Region (NLR) are considered. We assume that observable Z-shaped structures and the velocity pattern of the NLR may be explained as tri-dimensional helical waves in the ionization cone.
V. V. Mustsevoi, S. N. Dodonov, S. S. Khrapov, V. L. Afanasiev, Alexei Moiseev   +4 more
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THE ALIGNMENT OF GALAXY STRUCTURES

The Astrophysical Journal, 2015
We analyzed the orientation of the sample of ACO galaxy clusters. We examined the alignment in a subsample of 1056 galaxy structures taken from the Panko–Flin (2006) Catalog with known BM morphological types. We were looking for a correlation between the orientation of the cluster and the positions of neighboring clusters.
Piotr Flin, Elena Panko, Wlodzimierz Godlowski, Katarzyna Bajan, Monika Biernacka   +4 more
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THE STRUCTURE OF 2MASS GALAXY CLUSTERS [PDF]

The Astrophysical Journal, 2011
We use a sample of galaxies from the Two Micron All Sky Survey (2MASS) Extended Source Catalog to refine a matched filter method of finding galaxy clusters that takes into account each galaxy's position, magnitude, and redshift if available. The matched filter postulates a radial density profile, luminosity function, and line-of-sight velocity ...
Christopher S. Kochanek, Jeffrey A. Blackburne   +1 more
openaire   +3 more sources

Translators of Galaxy Morphology Indicators between Observation and Simulation

The Astrophysical Journal, 2023
Based on the recent advancements in numerical simulations of galaxy formation, we anticipate the achievement of realistic models of galaxies in the near future.
J. K. Jang, Sukyoung K. Yi, Yohan Dubois, Jinsu Rhee, Christophe Pichon, Taysun Kimm, Julien Devriendt, Marta Volonteri, Sugata Kaviraj, Sebastien Peirani, Sree Oh, Scott Croom   +11 more
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Analytical Approximations to Galaxy Clustering [PDF]

, 1997
We discuss some recent progress in constructing analytic approximations to the galaxy clustering. We show that successful models can be constructed for the clustering of both dark matter and dark matter haloes.
AJS Hamilton, B Jain, G Kauffmann, HJ Mo, HJ Mo, HJ Mo, HJ Mo, J Bardeen, JA Peacock, PJE Peebles, RJ Bower, T Padmanabhan, WH Press   +12 more
core   +3 more sources