FCC 35 and its H I companion: Multiwavelength observations and interpretation

被引:18
作者
Putman, ME [1 ]
Bureau, M
Mould, JR
Staveley-Smith, L
Freeman, KC
机构
[1] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Inst Adv Studies, Weston Creek, ACT 2611, Australia
[2] CSIRO, Australia Telescope Natl Facil, Epping, NSW 2121, Australia
关键词
galaxies; clusters; individual; (Fornax); (FCC; 35); interactions; starburst; intergalactic medium; ISM; clouds;
D O I
10.1086/300367
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The Fornax Cluster galaxy FCC 35 shows an unusual multiply peaked integrated H I profile. We have now observed FCC 35 with the Australia Telescope Compact Array and have found a compact H I source with M-HI = 2.2 x 10(8) M-. and a spatially overlapping complex of H I gas with the same mass. By combining optical observations with the H I data, we are able to identify FCC 35 as a young compact source of star formation with a nearby intergalactic H I cloud that is devoid of stars. We classify FCC 35 as a blue compact dwarf or H II galaxy, having large amounts of neutral hydrogen, very blue colors (U-V = 0.1), and a low-metallicity spectrum with strong narrow emission lines. Together with the presence of the H I cloud, this suggests that FCC 35 is the result of a recent interaction within the Fornax Cluster.
引用
收藏
页码:2345 / 2355
页数:11
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