Different studies of the global pitch angle of the Milky Way's spiral arms

Vallée, J. P.

doi:10.1093/mnras/stv862

Cited by 48 publications

(52 citation statements)

References 57 publications

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“…Their ring R1 is made up of an 'ascending' segment of pitch +6° (near the Carina arm, their Figures 2(b) and 4(a)) and a 'descending' segment of pitch −6° (near the Sagittarius arm -their Figures 2(b) and 4(a)), giving a mean ring pitch of 0°. But the observations show the Carina-Sagittarius arm to be a continuous spiral with the same pitch of −13° [20].…”

Section: Discussionmentioning

confidence: 90%

“…In the more recent period from 2002 to 2016, the observed 's' value, calibrated with R sun near 8.0 kpc, turns out to be near 3.1 kpc [17,20].…”

Section: The Interarm 'S'mentioning

confidence: 87%

“…Angles a and b in this plot are for mathematical uses here in equations; they should not be used to describe physical galactic latitude. Adapted and updated from [20].…”

Section: Discussionmentioning

confidence: 99%

“…Then one needs a meta-analysis to mosaic them and to reconstruct a full view or model as seen from above -see [7,8,[13][14][15][16][17][18][19][20].…”

Section: Spiral Arm Shapementioning

confidence: 99%

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A guided map to the spiral arms in the galactic disk of the Milky Way

Vallée

2017

Astronomical Review

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An up-to-date overview of the recent history is given, aiming is to present a helpful working guide to the literature and at the same time introduce key systems and observational results, starting from the Sun and going toward the Galactic Center and parts of the Zona Galactica Incognita, and beyond. We start by presenting an observational view of the Milky Way's disk plane (cartographic, dynamical, chemical crosscut, magnetic). This included the four long spiral arms in the disk of the Milky Way galaxy, their geometry, components, velocity, their widths and internal layers as well as onion-like ordered offsets, the central galactic bars, arm tangents, arm pitch and arm shape, arm origins near the Galactic Center, and other possible players in the spiral arm, such as the magnetic field and the dark matter content. After, we present a basic analysis of some theoretical predictions from galactic arm formation: numerical simulations or analytical theories, and observations are checked against predictions from various numerical simulations and analytical (theoretical) models.

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Section: Discussionmentioning

confidence: 90%

“…In the more recent period from 2002 to 2016, the observed 's' value, calibrated with R sun near 8.0 kpc, turns out to be near 3.1 kpc [17,20].…”

Section: The Interarm 'S'mentioning

confidence: 87%

“…Angles a and b in this plot are for mathematical uses here in equations; they should not be used to describe physical galactic latitude. Adapted and updated from [20].…”

Section: Discussionmentioning

confidence: 99%

“…Then one needs a meta-analysis to mosaic them and to reconstruct a full view or model as seen from above -see [7,8,[13][14][15][16][17][18][19][20].…”

Section: Spiral Arm Shapementioning

confidence: 99%

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A guided map to the spiral arms in the galactic disk of the Milky Way

Vallée

2017

Astronomical Review

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“…Many values for the interarm separation, tangent to spiral arms (as seen from the Sun) and pitch angle of individual spiral arm segments in the Galaxy, have been published (Hou & Han ; Vallée ).…”

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confidence: 99%

The nearby spiral density‐wave structure of the Galaxy: Line‐of‐sight and longitudinal velocities of 61 masers

et al. 2017

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This paper is the eighth in a series presenting the results of the dynamical analysis of velocity fields of Galactic objects on the assumption that the system is subject to moderately unstable, low‐amplitude, tightly wound, and rigidly rotating Lin–Shu density waves. The data of 61 masers associated with star‐forming regions having distances d<4 kpc from the Sun and h<200 pc from the plane are collected from the work by Reid et al. Both line‐of‐sight vlos and transverse along the Galactic longitude vlvelocities of these objects are analyzed. It is shown that there may coexist at least two radial scales of irregularity of a velocity field with different wavelengths λ≈2 and λ≈3.5 kpc and amplitudes of the perturbed gravitational potential for all values of the number of spiral arms considered, m = 1, 2, 3, and 4. To be consistent with the current ideas as to the spiral structure of the Galaxy, we argue respectively that the Sun is located at the inner edge of the Cygnus–Orion arm (very close to the arm center), between the nearby inner Carina–Sagittarius and outer Perseus arms (closer to the inner one). Estimates obtained from an analysis of two independent velocities vlos and vl are fairly consistent. As for us, the latter establishes further evidence to support the Lin–Shu wave proposal.

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The Building Blocks of Spiral Arms in Galaxies

Harsoula

2023

Springer Proceedings in Complexity

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Different studies of the global pitch angle of the Milky Way's spiral arms

Cited by 48 publications

References 57 publications

A guided map to the spiral arms in the galactic disk of the Milky Way

A guided map to the spiral arms in the galactic disk of the Milky Way

The nearby spiral density‐wave structure of the Galaxy: Line‐of‐sight and longitudinal velocities of 61 masers

The Building Blocks of Spiral Arms in Galaxies

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