HI in Early-type Galaxies

Publications of the Astronomical Society of Australia

Tom Oosterloo¹ 

[1] Raffaella Morganti

关键词: galaxies: elliptical and lenticular;    cD;    galaxies: ISM;   

DOI  :  10.1071/AS99028

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

We summarise the HI properties of early-type galaxies, in particular the differences in HI morphologies observed in early-type galaxies of different luminosities. We find that in low-luminosity early-type galaxies the HI is almost always in a disk-like structure, with central surface densities high enough for star formation to occur. In a few luminous early-type galaxies the HI is also in a disk or in a ring-like structure, but in most luminous early-type galaxies the HI has a relatively irregular morphology. The surface densities in the HI disks in luminous early-type galaxies are lower than in the HI disks in low-luminosity early-type galaxies and no large-scale star formation should occur in these disks. We discuss these different HI characteristics in the context of other properties of early-type galaxies that correlate with luminosity.

【 授权许可】

Unknown