38,371 research outputs found
The Tail of the HI Mass Function
The contribution of extragalactic objects with HI masses below
to the HI mass function remains uncertain. Several aspects of the detection of
low-mass sources in HI surveys are not always considered, and as a result
different analysis techniques yield widely different estimates for their number
density. It is suggested at one extreme that the number density of galaxies
follows a shallow Schechter power-law slope, and at the other extreme that it
follows a steep faint-end rise like that found for field optical sources. Here
we examine a variety of selection effects, issues of completeness, and
consequences of LSS. We derive results for the large Arecibo Dual Beam Survey
which indicate that the field mass function does rise steeply, while within the
Virgo Cluster environs, the slope appears to be much shallower. Dependence on
the local density of galaxies may partially explain differences between
surveys.Comment: 8 pages, presented at Mapping the Hidden Universe: The Universe in
HI. eds Kraan-Korteweg, Henning, Andernac
Using a VAT for Deficit Reduction
Examines implications of imposing a value-added tax, compared with increasing individual income tax rates (including capital gains tax), such as the distribution of the tax burden on households, distortions on economic decisions, and government costs
Using a VAT to Reform the Income Tax
Analyzes a proposal to simplify the tax system and improve economic incentives by adopting a value-added tax, removing most current taxpayers from income tax rolls, reforming the corporate income tax, and lowering the top individual and corporate rates
Reducing the Deficit by Increasing Individual Income Tax Rates
Estimates impact on debt-to-GDP ratio of raising all individual income tax rates, including the capital gains tax; raising the top three rates and leaving capital gains rate unchanged; and raising the top two rates and leaving capital gains unchanged
Methodology for Distributing a VAT
Proposes a revised methodology for analyzing the distributional effects of a value-added tax - the economic burden placed on households of different income levels and demographics - as well as on government revenues and spending and capital
Gas and Stars in an HI-Selected Galaxy Sample
We present the results of a J-band study of the HI-selected Arecibo Dual-Beam
Survey and Arecibo Slice Survey galaxy samples using the 2 Micron All-Sky
Survey data. We find that these galaxies span a wide range of stellar and gas
properties. However, despite the diversity within the samples, we find a very
tight correlation between luminosity and size in the J-band, similar to that we
previously found (Rosenberg & Schneider 2003) between the HI mass and size. We
also find that the correlation between the baryonic mass and the J-band
diameter is even tighter than between the baryonic mass and the rotational
velocity.Comment: AJ in press, 17 pages (including tables and figures) + 6 additional
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