NUCLEAR MOLECULAR GAS BAR PERPENDICULAR TO THE STELLAR BAR IN NGC-3351

被引:59
作者
DEVEREUX, NA
KENNEY, JDP
YOUNG, JS
机构
[1] NEW MEXICO STATE UNIV,DEPT ASTRON,LAS CRUCES,NM 88003
[2] CALTECH,OWENS VALLEY RADIO OBSERV,PASADENA,CA 91125
[3] UNIV MASSACHUSETTS,FIVE COLL RADIO ASTRON OBSERV,AMHERST,MA 01003
关键词
D O I
10.1086/116100
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
New interferometric observations of the molecular gas within the early type barred spiral galaxy NGC 3351 (M95) have revealed a nuclear molecular gas bar approximately 1 kpc long, that is aligned perpendicular to the large scale stellar bar. The mass of gas associated with the nuclear molecular gas bar is approximately 1.8 x 10(8) M. representing approximately 25% of the total molecular gas mass. NGC 3351 is associated with other distinguishing morphological characteristics including a nuclear ring of H II regions, which brought NGC 3351 early notoriety as a "hotspot nucleus," and a much larger ring of H II regions that encircles the stellar bar. Collectively, the distinctive morphology of the neutral and ionized medium within NGC 3351 can be understood in terms of resonances associated with a stellar bar pattern rotating at an angular velocity of approximately 60 km/s kpc-1.
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页码:784 / 792
页数:9
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