UGC-7636 AND NGC-4472 - TIDAL INTERACTION BETWEEN A STRIPPED DWARF IRREGULAR AND A GIANT ELLIPTIC GALAXY

被引：22

作者：

PATTERSON, RJ ^{[1
]}

THUAN, TX ^{[1
]}

机构：

[1] UNIV VIRGINIA,DEPT ASTRON,CHARLOTTESVILLE,VA 22903

来源：

ASTROPHYSICAL JOURNAL | 1992年 / 400卷 / 02期

关键词：

GALAXIES; EVOLUTION; INDIVIDUAL; (UGC-7636; NGC-4472); INTERACTIONS; INTERSTELLAR MATTER; PHOTOMETRY;

D O I：

10.1086/186648

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present new B and I CCD and H I observations of the system in the Virgo Cluster composed of the dwarf irregular galaxy UGC 7636 and the giant elliptical galaxy NGC 4472. These observations strongly suggest that both ram-pressure and tidal stripping have occurred in this system. The H I gas between the two galaxies has been stripped from UGC 7636. Its M(H I)/L(B) ratio is 0.26 M./L(B)., in the range observed for dwarf irregulars. Ram-pressure stripping of the H I gas from the dwarf is suggested by the large velocity width (DELTAv50 approximately 110 km s-1) of the spatially extended H i envelope. The presence of a red optical tidal tail and countertail in the dwarf, with the same colors as the stars in the dwarf's outer regions, as well as a disturbed morphology in the dwarf's inner parts, are evidence for tidal interaction between the two galaxies.

引用

页码：L55 / &

共 29 条

[1]

Arp H. C., 1966, ATLAS PECULIAR GALAX

[2]

BESSELL MS, 1979, 14 DUDL OBS REP, P279

[3] H-I IN GIANT ELLIPTICAL GALAXIES WITH COOLING FLOWS [J].