689 research outputs found
The Central Gas Systems of Early-Type Galaxies Traced by Dust Feature: Based on the HST WFPC2 Archival Images
We investigated the central gas systems of E/S0 galaxies by making use of the
WFPC2 images of the Hubble Space Telescope archive. We searched the gas systems
that were traced by the dust with a new method of making color excess images in
F555W - F814W (V-I). Out of 25 sample galaxies, we detected gas system in 14
galaxies. The dust was newly detected in two galaxies that were thought to
contain no dust based on single band, pre-refurbishment data. The full extents
of the gas systems are 0.1 to 3.5 kpc, and the masses of the gas, log M(gas)
[M(solar)], are 4.2 to 7.2. The AGN activity is well correlated with existence
of the gas systems. None of galaxies without the gas systems show the AGN
activity. On the other hand, some galaxies with the gas systems show the AGN
activity; optical AGN activities are shown in 5 out of 11 galaxies of which
AGNs are optically studied, and radio activities are shown in 6 out of 14
galaxies. This shows that the AGN activity is driven with the gas system.Comment: gzipped tarred file containing 7 files: Tomita.tex (main text, needs
aaspp4.sty), Tomita.tab[1,2].tex (tables, need aj_pt4.sty), Tomita.fig
[1a,1b,1c,2].ps (PS figures). To be appeared in AJ, Vol.120, No.1 (July 2000
Public-Private Partnerships in the Sewerage Projects
J-GLOBAL ID:202101013193905836目 次
第1章 はじめに
第2章 下水道事業における官民連携
第3章 PFI (コンセッション方式) の導入事例
第4章 おわりに1520016217210717952application/pdfdepartmental bulletin pape
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