The distribution of atomic gas and dust in nearby galaxies - III. Radial distributions and metallicity gradients

被引：22
作者：
Thomas, HC
Alexander, P
Clemens, MS
Green, DA
Dunne, L
Eales, S
机构：
[1] Cavendish Lab, Mullard Radio Astron Observ, Cambridge CB3 0HE, England
[2] Univ Padua, Dept Astron, I-35122 Padua, Italy
[3] Univ Wales Coll Cardiff, Dept Phys & Astron, Cardiff CF2 3YB, S Glam, Wales
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2004年 / 351卷 / 01期
关键词：
galaxies : abundances; galaxies : ISM; galaxies : structure; radio lines : galaxies;
D O I：
10.1111/j.1365-2966.2004.07795.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The radial distribution of dust and gas in 38 nearby galaxies is investigated, using a sample of galaxies for which matched resolution (25 arcsec) neutral hydrogen (H I) and 850-mum images are available. Most of these radial profiles are fitted well by an exponential model, and the derived 850-mum scalelengths are proportional to the H I scalelengths. From this relation, it is found that the metallicity gradients of these galaxies are much shallower than previous studies, unless the dust temperature is constant within the disc, or a significant component of molecular gas exists at large radii that is not traced by CO observations.
引用
收藏
页码：362 / 374
页数：13
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