Studying the Kinematics of Faint Stellar Populations with the Planetary Nebula Spectrograph - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




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Abstract: Galaxies are faint enough when one observes just their light distributions,but in studying their full dynamical structure the stars are spread over thesix dimensions of phase space rather than just the three spatial dimensions,making their densities very low indeed. This low signal is unfortunate, asstellar dynamics hold important clues to these systems- life histories, and theissue is compounded by the fact that the most interesting information comesfrom the faintest outer parts of galaxies, where dynamical timescales andhence memories of past history are longest.To extract this information, we have constructed a special-purposeinstrument, the Planetary Nebula Spectrograph, which observes planetary nebulaeas kinematic tracers of the stellar population, and allows one to study thestellar dynamics of galaxies down to extremely low surface brightnesses. Here,we present results from this instrument that illustrate how it can uncover thenature of low surface-brightness features such as thick disks by studying theirkinematics, and trace faint kinematic populations that are photometricallyundetectable.



Autor: Michael R. Merrifield University of Nottingham, the PN.S Consortium

Fuente: https://arxiv.org/







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