Results 1 to 10 of about 744,035 (326)
Symposium - International Astronomical Union, 1964 The title which the organizers of the Symposium have suggested for this introductory report covers an enormous domain. Even if one limits oneself, as I intend to do, to the large-scale structure, it is impossible to summarize this adequately in one communication.
J. H. Oort
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Spiral structure of our Galaxy and of other galaxies [PDF]
Symposium - International Astronomical Union, 1970 Time and again Dr. B. Bok publishes his reviews on the state of optical searches of the spiral arms in our Galaxy. A great optimist at the beginning, concerning the agreement of different results, he became later more critical in his conclusions. But in his paper of 1967 he claims anew, as well established, that we can trace the spiral arms up to a ...
B.A. Vorontsov-Velyaminov
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Spiral structure in external galaxies [PDF]
Symposium - International Astronomical Union, 1970 The need for observing at least four different categories of optical objects for a satisfactory definition of optical spiral structure is emphasized. A sequence of optical form-types for the description of spiral structure is outlined. A pronounced difference in the nature of the spiral structure of the outer and inner parts of Messier 33 is ...
W. W. Morgan
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Spiral Structure and Galaxy Environment [PDF]
The Astronomical Journal, 2002 Among 330 normal spirals of types Sa-Sc the fraction of objects exhibiting ``ring'', ``intermediate'' and ``spiral'' arm varieties does not correlated with environment.
Buta R. +3 more
core +4 more sources
Something about the structure of the Galaxy [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 We analyse a sample of 507 evolved stars in the inner galactic Plane. We derive average ages for subsets of this sample and use those sets as beacons for the evolution of the Galaxy.
M. N. Sevenster, Sridhar
core +6 more sources
The Galaxy Structure-Redshift Relationship [PDF]
, 2004 There exists a gradual, but persistent, evolutionary effect in the galaxy population such that galaxy structure and morphology change with redshift. This galaxy structure-redshift relationship is such that an increasingly large fraction of all bright and
A Graham +49 more
core +4 more sources
Structure and Evolution of Dwarf Galaxies [PDF]
, 2014 Different structural parameter correlations show how classical bulge components and elliptical galaxies are different from spiral and S0 galaxy disks, irregular (Im) galaxies, and spheroidal (Sph) galaxies. In contrast, the latter, apparently diverse galaxies or galaxy components have almost identical parameter correlations.
arxiv +5 more sources
The spiral structure of galaxies [PDF]
Nature, 1979 Bernard J. T. Jones, Scott Tremaine
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The Distribution of Open Clusters in the Galaxy
Frontiers in Astronomy and Space Sciences, 2021 In this work we explore the new catalog of galactic open clusters that became available recently, containing 1,750 clusters that have been re-analyzed using the Gaia DR2 catalog to determine the stellar memberships.
Hektor Monteiro +3 more
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Properties of galaxies with ring structures [PDF]
Astronomy & Astrophysics, 2021 Aims. We present a statistical analysis of different characteristics of ringed spiral galaxies with the aim of assessing the effects of rings on disk galaxy properties. Methods. We built a catalog of ringed galaxies from the Sloan Digital Sky Survey Data Release 14 (SDSS-DR14).
Georgina Coldwell +5 more
openaire +5 more sources