On the Spiral Structure of Disk Galaxies Iii. Comparison With Observations

LIN, C. C.; Yuan, Charles; SHU, FRANK H.

doi:10.1142/9789814415651_0039

Cited by 3 publications

(3 citation statements)

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“…a-Reversal of the inner arm edge with the Galactic Meridian (Section 2): Density wave theory (Lin & Shu 1964;Lin et al 1969) predicts that the interarm gas, in a circular orbit around the Galactic Center, will overtake a slower moving spiral pattern, and be shocked at the entrance (leading to a hot dust lane), thus the hot dust lane would face inward toward the Galactic Center (below a galactic radius called co-rotation, at about 9 kpc in the Milky Way disk). In the density wave theory, the dust lane corresponds to the predicted location of a shock lane.…”

Section: Interpretation and Comparisonmentioning

confidence: 99%

A Substructure Inside Spiral Arms, and a Mirror Image Across the Galactic Meridian

Vallée

2016

ApJ

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While the galactic density wave theory is over 50 years old and well known in science, whether it fits our own Milky Way disk has been difficult to say. Here we show a substructure inside the spiral arms. This substructure is reversing with respect to the Galactic Meridian (longitude zero), and crosscuts of the arms at negative longitudes appear as mirror images of crosscuts of the arms at positive longitudes. Four lanes are delineated: mid-arm (extended 12 CO gas at mid arm, HI atoms), in-between offset by about 100 pc (synchrotron, radio recombination lines), in between offset by about 200 pc (masers, colder dust), and inner edge (hotter dust seen in Mid-IR and Near-IR).

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Section: Interpretation and Comparisonmentioning

confidence: 99%

A Substructure Inside Spiral Arms, and a Mirror Image Across the Galactic Meridian

Vallée

2016

ApJ

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“…It is worth noting that the chlorophyll distributions around the eddies usually have abundant fine structures with horizontal scales much smaller than the eddies. Spiral band is one of the most representative fine structures of vortex phenomenon, such as spiral arms of vortex galaxy (Hou et al, 2009; Kalnajs, 1973; Lin et al, 1969), spiral rain bands of tropical cyclones (MacDonald, 1968; Montgomery & Kallenbach, 1997; Senn & Hiser, 1959), and spiral chlorophyll bands of oceanic mesoscale eddies. One example of the oceanic spiral chlorophyll band is shown in Figure 1a around a cyclonic eddy located around 103°E, 38°S, and the surface chlorophyll concentration is greatly enhanced along the spiral band.…”

Section: Introductionmentioning

confidence: 99%

Surface Chlorophyll Enhancement in Mesoscale Eddies by Submesoscale Spiral Bands

Qiu

2020

Geophysical Research Letters

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Oceanic submesoscale processes (with scales ~1–10 km and approximately days) have been progressively recognized as an important upwelling mechanism to close the upper ocean nutrient budget and sustain the primary production in euphotic layer. Spiral band is one of the most typical submesoscale structures of mesoscale eddies, characterized with enhancement of surface chlorophyll concentration. By combining satellite ocean‐color, satellite‐altimetry, and surface drifter data, we find that the oceanic spiral chlorophyll bands emerge globally and share a series of structural and kinematic features with atmospheric spiral rain bands of tropical cyclones, which indicate that they are footprints of the vertical motions induced by vortex Rossby waves embedded in eddies. As vortex Rossby waves are closely related to eddy evolution under background deformation, further observational analysis indicates that an intense eddy energy variation and a strong background deformation field constitute the favorable conditions for the emergence of the spiral chlorophyll bands.

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“…Since then, many models have been proposed (4) and debated (5). Popular models (6, 7) suggest a grand design morphology with two-or four-armed spiral structure (8), such as M 51 or NGC 1232 ( Fig. 1).…”

Section: Introductionmentioning

confidence: 99%