UNCOVERING THE ORIGINS OF SPIRAL STRUCTURE BY MEASURING RADIAL VARIATION IN PATTERN SPEEDS
UNCOVERING THE ORIGINS OF SPIRAL STRUCTURE BY MEASURING RADIAL VARIATION IN PATTERN SPEEDS
复制标题
通过测量图案速度的径向变化来揭示螺旋结构的起源
DOI:
10.1088/0004-637x/702/1/277
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Meidt S
中科院分区:
文献类型:
--
作者:
Meidt S
Current theories of spiral and bar structure predict a variety of pattern speed behaviors, calling for detailed, direct measurement of the radial variation of pattern speeds. Our recently developed Radial Tremaine–Weinberg (TWR) method allows this goal to be achieved for the first time. Here, we present TWR spiral pattern speed estimates for M101, IC 342, NGC 3938, and NGC 3344 in order to investigate whether spiral structure is steady or winding, whether spirals are described by multiple pattern speeds, and the relation between bar and spiral speeds. Where possible, we interpret our pattern speeds estimates according to the resonance radii associated with each (established with the disk angular rotation), and compare these to previous determinations. By analyzing the high-quality H i and CO data cubes available for these galaxies, we show that it is possible to determine directly multiple pattern speeds within these systems, and hence identify the characteristic signatures of the processes that drive the spiral structure. Even this small sample of galaxies reveals a surprisingly complex taxonomy, with the first direct evidence for the presence of resonant coupling of multiple patterns found in some systems, and the measurement of a simple single-pattern speed in others. Overall, this study demonstrates that we are now in a position to uncover more of the apparently complex physics that lies behind spiral structure.
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DOI:
10.1086/169577
发表时间:
1991
期刊:
The Astrophysical Journal
影响因子:
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作者:
J. Kenney;N. Scoville;C. Wilson
通讯作者:
J. Kenney;N. Scoville;C. Wilson
DOI:
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2000
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发表时间:
2002
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作者:
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通讯作者:
Makoto Ideta
DOI:
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发表时间:
2008
期刊:
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作者:
U. Klein;Gianfranco Gentile;P. Salucci;G. Józsa;F. Kenn
通讯作者:
F. Kenn
DOI:
--
发表时间:
1990
期刊:
影响因子:
--
作者:
M. Thomasson;B. Elmegreen;K. J. Donner;B. Sundelius
通讯作者:
B. Sundelius