منابع مشابه
Star clusters as tracers of galaxy evolution
Star clusters represent the most common ‘mode’ of star formation. They are found in all types of environments, cascading down from galaxy groups and merging pairs through starbursts to normal galaxies and dwarves and even isolated regions in extragalactic space. As they maintain a link to the overall star formation in a system, they can be used as tracers of the star formation history of enviro...
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Molecular gas plays an important role in the structure of planetary nebulae: it is a major component of the equatorial tori of bipolar nebulae, it forms the cores of globules and related mircostructures, and is the likely origin of multiple arcs. It is also a key component during the early stages of formation where interactions with outflows or jets provide an important shaping mechanism.
متن کاملPlanetary nebulae as tracers of galaxy stellar populations
We address the general problem of the luminosity-specific planetary nebula (PN) number, better known as the “α” ratio, given by α = NPN/Lgal, and its relationship with age and metallicity of the parent stellar population. Our analysis relies on population synthesis models, that account for simple stellar populations (SSPs), and more elaborated galaxy models covering the full star-formation rang...
متن کاملMetastable helium molecules as tracers in superfluid 4He.
Metastable helium molecules generated in a discharge near a sharp tungsten tip immersed in superfluid 4He are imaged using a laser-induced-fluorescence technique. By pulsing the tip, a small cloud of He(2*) molecules is produced. We can determine the normal-fluid velocity in a heat-induced counterflow by tracing the position of a single molecule cloud. As we run the tip in continuous field-emis...
متن کاملGalaxy tracers in cosmological N-body simulations
Galaxies, and the large-scale structure that they trace, grew via gravitational instability from small amplitude Gaussian density fluctuations. This nonlinear process can be studied by means of N -body simulations. The main target of this approach is to evaluate various cosmological theories of structure formation. Unfortunately, the dynamical range of current cosmological simulations is inadeq...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2012
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921313001105