Tracing the Origin of Moving Groups. III. Detecting Moving Groups in LAMOST DR7

Yang, Y. G.; Zhao, Jingkun; Zhang, Jiajun; Ye, Xianhao; Zhao, Gang

doi:10.3847/1538-4357/ac289e

Cited by 10 publications

(10 citation statements)

References 45 publications

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“…In recent years, the detection of the Gaia-Sausage structure in velocity space is associated to the largest merge event of the Gaia-Sausage-Enceladus dwarf galaxy with the MW, which also brought a lot of debris stars into the Galactic disk. The LAMOST spectroscopic survey makes it possible to identify its metal-rich component after merging into the Galactic disk a long time ago (Yang et al 2021;Zhao & Chen 2021). Recent merging of Sgr dwarf galaxy in the outer disk is reported, leaving many substructures in the anticenter region, which are interesting targets in many works.…”

Section: Introductionmentioning

confidence: 99%

The Substructures in the Anticenter Region of the Milky Way

Zhang

Shi

Chen

et al. 2022

ApJ

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We investigated the observational properties of Triangulum-Andromeda (TriAnd), Monoceros Ring (MRi), and Anti-Center Stream (ACS) in the anticenter region using K giants, M giants, and RGB stars from LAMOST and SDSS survey. The Friends of Friends algorithm was applied to select member stars of these structures. We found a new spur of TriAnd at l ∼ 133° based on member stars selected in this work and compiled from the literature. The distributions of radial velocity and proper motion of its member stars indicate that TriAnd is gradually moving away from the Sun. The comparisons of [Fe/H] and [α/Fe] between TriAnd and thick-disk/halo stars reveal that TriAnd is likely to originate from the thick disk. MRi and ACS are adjacent in space with a boundary around latitude 30°, and there is no significant difference between the two structures in velocity, proper motions, and orbits. We suggested that MRi and ACS probably have a common origin. We made projections of the four structures in three-dimensional space for the exploration of the movements between the Sagittarius (Sgr) stellar stream and MRi, and found that a new spur was formed by the Sgr stream members in the velocity distribution as it passed through the MRi region.

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Section: Introductionmentioning

confidence: 99%

The Substructures in the Anticenter Region of the Milky Way

Zhang

Shi

Chen

et al. 2022

ApJ

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“…We require that detected extrema are separated by at least the wavelet scale size (2 𝑗 ). This is accomplished using the peak_local_max function in the scikit-image package (van der Walt et al 2014). We then ensure that if there are two peaks or two troughs within 2 𝑗 pixels, we only keep the extremum with the larger wavelet coefficient.…”

Section: Wavelet Transform Methodsmentioning

confidence: 99%

“…Recent work has also utilized the WT to explore the kinematic space of the MW (Antoja et al 2008;Kushniruk et al 2017;Ramos et al 2018;Yang et al 2021;Bernet et al 2022). Ramos et al (2018) (hereafter R18) used Gaia DR2 and the WT to detect moving groups in the 𝑉 𝑟 −𝑉 𝜙 plane and found many arch features covering the majority of previously known moving groups.…”

Section: Introductionmentioning

confidence: 99%

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Moving groups across Galactocentric radius with Gaia DR3

Lucchini,

Pellett,

D'Onghia

et al. 2022

Preprint

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The kinematic plane of stars near the Sun has proven an indispensable tool for untangling the complexities of the structure of our Milky Way (MW). With ever improving data, numerous kinematic "moving groups" of stars have been better characterized and new ones continue to be discovered. Here we present an improved method for detecting these groups using MGwave, a new open-source 2D wavelet transformation code that we have developed. Our code implements similar techniques to previous wavelet software; however, we include a more robust significance methodology and also allow for the investigation of underdensities which can eventually provide further information about the MW's non-axisymmetric features. Applying MGwave to the latest data release from Gaia (DR3), we detect 45 groups of stars with coherent velocities. We reproduce the majority of the previously detected moving groups in addition to identifying four additional significant candidates: one near Antoja12-GCSIII-13, one near GMG 5, and two with very low 𝑉 𝑟 and similar 𝑉 𝜙 to Hercules. Finally, we have followed these associations of stars beyond the solar neighborhood, from Galactocentric radius of 6.5 to 10 kpc. Most detected groups are extended throughout radius indicating that they are streams of stars possibly due to non-axisymmetric features of the MW.

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“…An increasing amount of data from revolutionary surveys are revealing that the Milky Way is full of substructures, either in the disk (e.g., Zhao et al 2009;Liang et al 2017;Ramos et al 2018;Zhao et al 2018;Antoja et al 2018;Ye et al 2021;Re Fiorentin et al 2021;Yang et al 2021;Zhao & Chen 2021), or in the halo (e.g., Ibata et al 1994;Newberg et al 2002Newberg et al , 2009Law & Majewski 2010;Helmi et al 2018;Zhao et al 2020). Among those substructures, dynamically cold streams, which are usually related to globular clusters (GCs), play an important role (e.g., Grillmair & Johnson 2006;Grillmair & Dionatos 2006;Odenkirchen et al 2009;Bonaca et al 2012;Koposov et al 2014).…”

Section: Introductionmentioning

confidence: 99%

A New Cold Stream near the Southern Galactic Pole

Yang

Zhao

Xue³

et al. 2022

ApJL

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We report the discovery of a cold stream near the southern Galactic pole (dubbed as SGP-S) detected in Gaia Early Data Release 3. The stream is at a heliocentric distance of ∼9.5 kpc and spans nearly 58° by 0.°6 on sky. The color–magnitude diagram of SGP-S indicates an old and metal-poor (age ∼12 Gyr, [M/H] ∼ −2.0 dex) stellar population. The stream’s surface brightness reaches an exceedingly low level of Σ G ≃ 36.2 mag arcsec−2. Neither extant globular clusters nor other known streams are associated with SGP-S.

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Tracing the Origin of Moving Groups. III. Detecting Moving Groups in LAMOST DR7

Cited by 10 publications

References 45 publications

The Substructures in the Anticenter Region of the Milky Way

The Substructures in the Anticenter Region of the Milky Way

Moving groups across Galactocentric radius with Gaia DR3

A New Cold Stream near the Southern Galactic Pole

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