By K.C. Freeman (auth.), R. S. DE JONG (eds.)

ISBN-10: 1402055722

ISBN-13: 9781402055720

ISBN-10: 1402055730

ISBN-13: 9781402055737

This booklet comprises an updated overview of the constitution and evolution of disk galaxies from either the observational and theoretical viewpoint. The booklet is the court cases of the "Island Universes" convention held on the island of Terschelling, The Netherlands in July 2005, which attracted approximately a hundred thirty specialists and scholars within the box. The convention was once equipped as a tribute to Dr. Piet C. van der Kruit for receiving the honorary Jacobus C. Kapteyn Professorship in Astronomy. The 8 topical subject matters mentioned on the assembly are mirrored in those lawsuits: 1) homes of Stellar Disks, 2) Kinematics and Dynamics of Disk Galaxies, three) Bars, Spiral constitution, and Secular Evolution in Disk Galaxies, four) The Outskirts and surroundings of Disk Galaxies, five) Interstellar topic, 6) (Evolution of) big name Formation in Galactic Disks, 7) Disk Galaxies via Cosmic Time, and eight) Formation types of Disk Galaxies. those court cases are concluded with a convention precis reflecting at the most vital contemporary development and extraordinary difficulties. This quantity is exclusive in that it brings jointly any such huge diversity of elements of disk galaxies: constitution and dynamics, the most recent multi-wavelength surveys, low- and excessive redshift observations, thought and observations. This e-book is addressed to expert astronomers and their students.

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This conference) argue that the halo of M31 extends even further, out to a radius of about 150 kpc. New kinematical data confirms that the disk of M31 extends beyond 50 kpc (10 scalelengths). The outer disk is rotating almost as rapidly as the inner disk (Ibata et al. 2005), with a small rotational lag and a velocity dispersion of about 30 km s−1 . Stars in fields out to 80 kpc, away from the M31 stellar stream, have typical lags of 54 km s−1 and dispersions of 37 km s−1 . Ibata et al. argue that the outer disk formed from accretion of many small subgalactic structures.

If this turns out to be correct, then it would exclude heating of an early thin disk as the origin for the thick disk in this galaxy. At least one edge-on disk galaxy, NGC 4244 (Fry et al. 1999) appears to be a pure thin disk. Surface brightness cuts perpendicular to its disk show only a single exponential component, with no indication of a thick disk component down to a surface brightness level of about µ(R) = 28 mag acrsec−2 (see Fig. 12). The existence of such a pure disk galaxy is interesting because, at least for some late-type disks 14 ISLAND UNIVERSES Figure 12.

The relative baryonic mass fractions of the thin and thick disks therefore constrain the ratio of stars to gas in the early galaxy. In Yoachim & Dalcanton 2005b we have inferred the luminosities of the thick and thin disks from the two-dimensional decompositions, and then adopted color-dependent stellar mass-to-light ratios to derive the stellar mass of each disk component. The resulting “baryon budget” is reproduced in Figure 4, as a function of galaxy mass for the late-type Dalcanton & Bernstein (2000) sample, after assuming that any gas is confined to the thin disk.

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