Local Spiral Structure Traced by Red Clump Stars

Lin, Zuzhang; Xu, Ye; Hou, Ligang; Liu, Dejian; Li, Yingjie; Hao, Chaojie; Li, Jingjing; Bian, S. B.

doi:10.3847/1538-4357/ac67a6

Cited by 8 publications

(9 citation statements)

References 58 publications

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“…We find a correspondence between the overdensities in this sample and these reported by Poggio et al (2021) for the younger UMS population (fourth panel); although some discrepancies are observed at (X, Y) ≈ (−1, −9) kpc and (−2,−6.5) kpc. The presence of the spiral arms traced by an old population has been recently proposed by Lin et al (2022), who identified the Local Arm in a sample of 87 000 Gaia EDR3-2MASS (Gaia Collaboration 2021; Skrutskie et al 2006), Red Clump stars (RC) and could be related to the metallicity asymmetry in Sample B and C in Poggio et al (2022, see their Fig. 1).…”

Section: Spiral Armsmentioning

confidence: 64%

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Spiral-like features in the disc revealed by Gaia DR3 radial actions

Palicio

Recio–Blanco

Poggio

et al. 2023

A&A

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Context. The so-called action variables are specific functions of the positions and velocities that remain constant along the stellar orbit. The astrometry provided by Gaia Early Data Release 3 (EDR3), combined with the velocities inferred from the Radial Velocity Spectrograph (RVS) spectra of Gaia DR3, allows for the estimation of these actions for the largest volume of stars to date. Aims. We explore such actions with the aim of locating structures in the Galactic disc. Methods. We computed the actions and the orbital parameters of the Gaia DR3 stars, assuming an axisymmetric model for the Milky Way. Using Gaia DR3 photometric data, we also selected a subset of giant stars with better astrometry as a control sample. Results. We find that the maps of the percentiles of the radial action JR reveal arc-like segments. We found a high JR region centered at R ≈ 10.5 kpc of 1 kpc width, as well as three arc-shape regions dominated by circular orbits at inner radii. We also identified the spiral arms in the overdensities of the giant population. Conclusions. For Galactic coordinates (X, Y, Z), we find good agreement with the literature in the innermost region for the Scutum-Sagittarius spiral arms. At larger radii, the low JR structure tracks the Local arm at negative X, while for the Perseus arm, the agreement is restricted to the X < 2 kpc region, with a displacement with respect to the literature at more negative longitudes. We detected a high JR area at a Galactocentric radii of ∼10.5 kpc, consistent with some estimations of the Outer Lindblad Resonance location. We conclude that the pattern in the dynamics of the old stars is consistent in several places with the spatial distribution of the spiral arms traced by young populations, with small potential contributions from the moving groups.

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Section: Spiral Armsmentioning

confidence: 64%

“…The J R maps suggest a connection between the Perseus and the Local Arm (Structures C and B, respectively). However, the spatial geometry of the spiral arms from UMS stars (Poggio et al 2021), Red Clump stars (Lin et al 2022), and the giant sample does not coincide with the observed features in J R in this region.…”

Section: Spiral Armsmentioning

confidence: 74%

Spiral-like features in the disc revealed by Gaia DR3 radial actions

Palicio

Recio–Blanco

Poggio

et al. 2023

A&A

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“…For instance, the structures traced by young OB stars are consistent with those traced by masers associated with HMSFRs (e.g., Xu et al 2018aXu et al , 2018bXu et al , 2021b. Additionally, the large age spans of open clusters made them suitable for studying the motion and evolution of spiral arms (e.g., Hao et al 2021), and even main-sequence stars and old stars can be used to constrain spiral arm structure (e.g., Poggio et al 2021;Lin et al 2022).…”

Section: Introductionmentioning

confidence: 66%

“…By comparing the spiral arm structures traced by masers with those traced by OB stars and open clusters obtained from Gaia astrometry, it is possible to study the consistency of the spiral arm structures traced by different young objects and the homogeneity of the distribution of star formation in the spiral arms (e.g., Xu et al 2018aXu et al , 2021b. Naturally, we also expect SKA-VLBI to be able to observe the spiral arm structure depicted by other tracers, such as AGB stars (see Section 3.1.2), which can be compared with the results from Gaia astrometry to study the spiral arm structure traced by old objects (e.g., Poggio et al 2021;Lin et al 2022). It is also interesting to compare the spiral structure traced by old and young objects (e.g., Lin et al 2022).…”

Section: The Structure Of the Milky Waymentioning

confidence: 87%

“…Naturally, we also expect SKA-VLBI to be able to observe the spiral arm structure depicted by other tracers, such as AGB stars (see Section 3.1.2), which can be compared with the results from Gaia astrometry to study the spiral arm structure traced by old objects (e.g., Poggio et al 2021;Lin et al 2022). It is also interesting to compare the spiral structure traced by old and young objects (e.g., Lin et al 2022).…”

Section: The Structure Of the Milky Waymentioning

confidence: 95%

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VLBI with SKA: Possible Arrays and Astrometric Science

Li,

Xu,

et al. 2024

Res. Astron. Astrophys.

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The next generation of very long baseline interferometry (VLBI) is stepping into the era of microarcsecond ($\mu$as) astronomy, and pushing astronomy, especially astrometry, to new heights. VLBI with the Square Kilometre Array (SKA), SKA-VLBI, will increase current sensitivity by an order of magnitude, and reach astrometric precision routinely below 10 $\mu$as, even challenging 1 $\mu$as. This advancement allows precise parallax and proper motion measurements of various celestial objects. Such improvements can be used to study objects (including isolated objects, and binary or multiple systems) in different stellar stages (such as star formation, main-sequence stars, asymptotic giant branch stars, pulsars, black holes, white dwarfs, etc.), unveil the structure and evolution of complex systems (such as the Milky Way), benchmark the international celestial reference frame, and reveal cosmic expansion. Furthermore, the theory of general relativity can also be tested with SKA-VLBI using precise measurements of light deflection under the gravitational fields of different solar system objects and the perihelion precession of solar system objects.

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Catalog of spiral arm tangents (Galactic longitudes) in the Milky Way, and the age gradient based on various arm tracers

Vallée

2022

New Astronomy

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Local Spiral Structure Traced by Red Clump Stars

Cited by 8 publications

References 58 publications

Spiral-like features in the disc revealed by Gaia DR3 radial actions

Spiral-like features in the disc revealed by Gaia DR3 radial actions

VLBI with SKA: Possible Arrays and Astrometric Science

Catalog of spiral arm tangents (Galactic longitudes) in the Milky Way, and the age gradient based on various arm tracers

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