Self-Consistent Models of Barred Spiral Galaxies
نویسندگان
چکیده
منابع مشابه
“Rotation curves” in self-consistent models of barred galaxies
We compare the “rotation curves” in self-consistent models of barred galaxies with the ones of SB0’s. The models are constructed with Schwarzschild’s method. The models reproduce the wavy pattern in the rotation curves observed in most SB0 galaxies. Depending on the local spatial mass fraction of retrograde orbits, the line-of-sight velocity is lowered or even negative. The local counter-rotati...
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The oxygen (O/H) and N/O abundance ratios along the bar of 16 barred spiral starburst galaxies are determined using long–slit spectroscopy. The abundance gradients and the spatial distribution of the ionized gas along the bar are used to understand the role of bars in starburst galaxies. The oxygen abundance gradients are steeper than in normal barred galaxies, with a mean of –0.15 dex/kpc, whi...
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To quantify the effect that bar driven mass inflow can have on the evolution of a galaxy requires an understanding of the dynamics of the inflowing gas. In this paper we study the kinematics of the dense molecular gas in a set of seven barred spiral galaxies to determine which dynamical effects dominate. The kinematics are derived from observations of the CO J=(1−0) line made with the Berkeley-...
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We have measured the bar lengths and widths of 125 barred galaxies observed with CCDs. The dependence of bar strength (identified with bar axis ratio) on morphological type, nuclear activity, central and mid-bar surface brightness is investigated. The properties of the bars are best explained if the sample is divided into early(< SBbc) and late-type galaxies, and into active (starburst, Seyfert...
متن کاملThe Formation of Spiral Arms and Rings in Barred Galaxies
We propose a theory to explain the formation of both spirals and rings in barred galaxies using a common dynamical framework. It is based on the orbital motion driven by the unstable equilibrium points of the rotating bar potential. Thus, spirals, rings and pseudo-rings are related to the invariant manifolds associated to the periodic orbits around these equilibrium points. We examine the param...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of the Pacific
سال: 1994
ISSN: 0004-6280,1538-3873
DOI: 10.1086/133371