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The lifetime of grand design

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Abstract
The lifetime of the structure in grand design spiral galaxies is observationally ill-determined, but is essentially set by how accurately the rotation of the pattern can be characterized by a single angular pattern speed. This paper derives a generalized version of the Tremaine-Weinberg method for observationally determining pattern speeds, in which the pattern speed is allowed to vary arbitrarily with radius. The departures of the derived pattern speed from a constant then provide a simple metric of the lifetime of the spiral structure. Application of this method to CO observations of NGC 1068 reveals that the pattern speed of the spiral structure in this galaxy varies rapidly with radius, and that the lifetime of the spiral structure is correspondingly very short. If this result turns out to be common in grand-design spiral galaxies, then these features will have to be viewed as highly transient phenomena.
Keywords
TREMAINE-WEINBERG METHOD, PATTERN SPEEDS, SPIRAL STRUCTURE, MOLECULAR, CLOUDS, NEARBY GALAXIES, GALACTIC DISKS, BIMA SONG, CO, DENSITY, SCALES, galaxies : individual, NGC 1068, galaxies : kinematics and dynamics, galaxies : spiral, galaxies : structure

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Citation

Please use this url to cite or link to this publication:

MLA
Merrifield, MR, et al. “The Lifetime of Grand Design.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 366, no. 1, 2006, pp. L17–21.
APA
Merrifield, M., Rand, R., & van der Wel, S. M. (2006). The lifetime of grand design. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 366(1), L17–L21.
Chicago author-date
Merrifield, MR, RJ Rand, and Sharon Meidt van der Wel. 2006. “The Lifetime of Grand Design.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 366 (1): L17–21.
Chicago author-date (all authors)
Merrifield, MR, RJ Rand, and Sharon Meidt van der Wel. 2006. “The Lifetime of Grand Design.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 366 (1): L17–L21.
Vancouver
1.
Merrifield M, Rand R, van der Wel SM. The lifetime of grand design. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2006;366(1):L17–21.
IEEE
[1]
M. Merrifield, R. Rand, and S. M. van der Wel, “The lifetime of grand design,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 366, no. 1, pp. L17–L21, 2006.
@article{8622915,
  abstract     = {The lifetime of the structure in grand design spiral galaxies is observationally ill-determined, but is essentially set by how accurately the rotation of the pattern can be characterized by a single angular pattern speed. This paper derives a generalized version of the Tremaine-Weinberg method for observationally determining pattern speeds, in which the pattern speed is allowed to vary arbitrarily with radius. The departures of the derived pattern speed from a constant then provide a simple metric of the lifetime of the spiral structure. Application of this method to CO observations of NGC 1068 reveals that the pattern speed of the spiral structure in this galaxy varies rapidly with radius, and that the lifetime of the spiral structure is correspondingly very short. If this result turns out to be common in grand-design spiral galaxies, then these features will have to be viewed as highly transient phenomena.},
  author       = {Merrifield, MR and Rand, RJ and van der Wel, Sharon Meidt},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  keywords     = {TREMAINE-WEINBERG METHOD,PATTERN SPEEDS,SPIRAL STRUCTURE,MOLECULAR,CLOUDS,NEARBY GALAXIES,GALACTIC DISKS,BIMA SONG,CO,DENSITY,SCALES,galaxies : individual,NGC 1068,galaxies : kinematics and dynamics,galaxies : spiral,galaxies : structure},
  language     = {eng},
  number       = {1},
  pages        = {L17--L21},
  title        = {The lifetime of grand design},
  url          = {http://dx.doi.org/10.1111/j.1745-3933.2005.00122.x},
  volume       = {366},
  year         = {2006},
}

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