Observations of cold dust in nearby elliptical galaxies

Spectral energy distribution (SED) analyses that include new millimeter to far-infrared (FIR) observations obtained with continuum instruments on the Nobeyama and James Clerk Maxwell Telescopes and the Infrared Space Observatory are presented for seven nearby (<45 Mpc) FIR-bright elliptical galaxies. These are analyzed together with archival FIR and shortwave radio data obtained from the NASA/IPAC Extragalactic Database (NED). The radio to infrared SEDs are best-fitted by power law plus graybody models of dust residing in the central galactic regions within a 2.4 kpc diameter and with temperatures between ~21 and 28 K, emissivity index simeq2, and masses from ~1.6 to 19 × 105 M☉. The emissivity index is consistent with dust constituting amorphous silicate and carbonaceous grains previously modeled for stellar-heated dust observed in the Galaxy and other nearby extragalactic sources. Using updated dust absorption coefficients for this type of dust, dust masses are estimated that are similar to those determined from earlier FIR data alone, even though the latter results implied hotter dust temperatures. Fluxes and masses that are consistent with the new FIR and submillimeter data are estimated for dust cooler than 20 K within the central galactic regions. Tighter physical constraints for such cold, diffuse dust (if it exists) with low surface brightness will need sensitive FIR to submillimeter observations with the Spitzer Space Telescope, SCUBA2, or ALMA

Comment from the Editors

This is the first issue of the third volume of the International Public Management Network e-publication The International Public Management Review (IPMR). IPMR is published twice per year on the IPMR website at www.ipmr.net. Volume 1, Number 1 appeared in December 2000 as a double issue to inaugurate the series. Volume 2, Issues 1 was published in March 2001 and Issues 2 appeared in November 2001. Back issues are available at www.ipmr.net

Comment from the editors

The articles in this issue are intended to be of interest to both academics and practitioners. The first piece presents the views of four internationally recognized public management scholars, Steven Kelman, Fred Thompson, L. R. Jones, and Kuno Schedler, on how the PM may be defined and understood as an emergent discipline. Their dialogue took place on the International Public Management list server in October 2003 and is reproduced here with only minor editorial changes. The second work in this issue by Clay Wescott explores how decentralization supports the policy commitments made by the Viet Nam government to increase citizen participation and accountability, and to reduce poverty and regional disparities. The article includes a review of basic definitions of decentralization to place this case study into an international context, a brief look at the unique historical context of Viet Nam, a comparison of policy intention versus implementation reality, an analysis of the impact of decentralization, and a concluding section on remaining challenges

Comment from the Editors

The articles in this issue are intended to be of interest to both academics and practitioners

Hyperfine Populations Prior to Muon Capture

It is shown that the 1S level hyperfine populations prior to muon capture will be statistical when either target or beam are unpolarised independent of the atomic level at which the hyperfine interaction becomes appreciable. This assertion holds in the absence of magnetic transitions during the cascade and is true because of minimal polarisation after atomic capture and selective feeding during the cascade.Comment: (revtex, 6 preprint pages, no figures

Virtual and Soft Pair Corrections to Polarized Muon Decay Spectrum

Radiative corrections to the muon decay spectrum due to soft and virtual electron--positron pairs are calculated.Comment: 10pp, 2 PS figs, details of calculations are adde