منابع مشابه
Secular Evolution of Galaxy Morphologies
Today we have numerous evidences that spirals evolve dynamically through various secular or episodic processes, such as bar formation and destruction, bulge growth and mergers, sometimes over much shorter periods than the standard galaxy age of 10− 15 Gyr. This, coupled to the known properties of the Hubble sequence, leads to a unique sense of evolution: from Sm to Sa. Linking this to the known...
متن کاملThe Sombrero galaxy ⋆ III . Ionised
We present the results of new 3D TIGER spectroscopic observations and archived HST/WFPC2 and NICMOS images of the central region of M 104. The [N ii]+Hα images reveal the presence of a nuclear spiral structure, and the gaseous kinematics in the central arc-second shows evidence for kinematical decoupling of the central peak. A straight nuclear dust lane, with a weak symmetric counterpart, is se...
متن کاملGalaxy Scaling Relations as a Result of Secular Evolution
The secular evolution process which slowly transforms the morphology of a given galaxy over its lifetime through mostly internal dynamical mechanisms could naturally account for most of the observed properties of physical galaxies (Zhang 2003a). As an emerging paradigm for galaxy evolution, its dynamical foundations had been established in the past few years (Zhang 1996, 1998, 1999). In this pa...
متن کاملHST photometry of globular clusters in the Sombrero galaxy ⋆
We explore the rich globular cluster (GC) system of the nearby Sa galaxy M104, the “Sombrero” (NGC 4594), using archive WFPC2 data. The GC colour distribution is found to be bimodal at the > 99% confidence level, with peaks at (V −I)0 = 0.96±0.03 and 1.21±0.03. The inferred metallicities are very similar to those of globular clusters in our Galaxy and M31. However the Sombrero reveals a much en...
متن کاملKeck Spectroscopy of Globular Clusters in the Sombrero Galaxy 1
We analyze high signal-to-noise spectra for 14 globular clusters (GCs) in the Sombrero galaxy, NGC 4594 = M104, obtained with the LRIS spectrograph on the Keck I telescope. We find generally good agreement between spectroscopic metallicities and previous photometric metallicites based on V −I colors. Further, we use measurements of various Balmer line indices on co-added spectra of metal-poor a...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1996
ISSN: 0074-1809
DOI: 10.1017/s0074180900232907