ATCA HI observations of the peculiar galaxy IC 2554

被引：22

作者：

Koribalski, B

Gordon, S

Jones, K

机构：

[1] CSIRO, Australia Telescope Natl Facil, Epping, NSW 1710, Australia

[2] Univ Queensland, Dept Phys, Brisbane, Qld 4072, Australia

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2003年 / 339卷 / 04期

关键词：

galaxies : individual : IC 2554; galaxies : individual : NGC 3136B; galaxies : individual : ESO 092-G009; galaxies : individual : RKK 1959; galaxies : interactions;

D O I：

10.1046/j.1365-8711.2003.06277.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

ATCA H I and radio continuum observations of the peculiar southern galaxy IC 2554 and its surroundings reveal typical signatures of an interacting galaxy group. We detected a large H I cloud between IC 2554 and the elliptical galaxy NGC 3136B. The gas dynamics in IC 2554 itself, which is sometimes described as a colliding pair, are surprisingly regular, whereas NGC 3136B was not detected. The H I cloud, which emerges from IC 2554 as a large arc-shaped plume, has a size of similar to30 kpc, larger than that of IC 2554. The total H I mass of the IC 2554 system is similar to2 x 10(9) M., one-third of which resides in the H I cloud. It is possible that tidal interaction between IC 2554 and NGC 3136B caused this spectacular H I cloud, but the possibility of IC 2554 being a merger remnant is also discussed. We also detected H I gas in the nearby galaxies ESO 092-G009 and RKK 1959 and an associated H I cloud, ATCA J1006-6710. Together they have an H I mass of similar to4.6 x 10(8) M-.. Another new H I source, ATCA J1007-6659, with an H I mass of only similar to2.2 x 10(7) M. was detected roughly between IC 2554 and ESO 092-G009 and corresponds to a face-on low surface brightness dwarf galaxy. Star formation is evident only in the galaxy IC 2554 with a rate of similar to4 M. yr(-1).

引用

页码：1203 / 1222

页数：20

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