Structural Characteristics and Stellar Composition of Low Surface Brightness Disk Galaxies

We present UBVI surface photometry of a sample of low surface brightness (LSB) disk galaxies. LSB disk galaxies are fairly well described as exponential disks with no preferred value for either scale length, central surface brightness, or rotational velocity. Indeed, the distribution of scale lengths is indistinguishable from that of high surface brightness spirals, indicating that dynamically similar galaxies (e.g., those with comparable Rv^2) exist over a large range in surface density. These LSB galaxies are strikingly blue. The complete lack of correlation between central surface brightness and color rules out any fading scenario. Similarly, the oxygen abundances inferred from HII region spectra are uncorrelated with color so the low metallicities are not the primary cause of the blue colors. While these are difficult to interpret in the absence of significant star formation, the most plausible scenario is a stellar population with a young mean age stemming from late formation and subsequent slow evolution. These properties suggest that LSB disks formed from low initial overdensities with correspondingly late collapse times.Comment: Astronomical Journal, in press 45 pages uuencoded postscript (368K) including 9 multipart figures also available by anonymous ftp @ ftp.ast.cam.ac.uk /pub/ssm/phot.uu CAP-30-210442962983742937

The politics of modern honor

Modern honor appears to be distinguished by two contradictory impulses, a neglect or even disdain of honor, and an ambition to elevate and promote it as dignity, self-esteem, and recognition. The article argues that these tensions can be traced to a foundational difference regarding the political importance of the passion of honor, evident in the seminal and contending formulations by Machiavelli and Hobbes. In recovering and articulating the bases of these competing modern conceptions of honor and tracing the influence of their divergent trajectories, the article seeks to show the importance of honor for understanding contemporary politics.Griffith Business School, School of Government and International RelationsFull Tex