A New Cold Stream near the Southern Galactic Pole

Yang, Y. G.; Zhao, Jingkun; Xue, Xiang-Xiang; Ye, Xianhao; Zhao, Gang

doi:10.3847/2041-8213/ac853c

Cited by 3 publications

(2 citation statements)

References 46 publications

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“…The Milky Way has proven to be full of substructures either embedded in the disk (e.g., Zhao et al 2009;Liang et al 2017;Antoja et al 2018;Zhao et al 2018;Re Fiorentin et al 2021;Yang et al 2021;Ye et al 2021;Zhao & Chen 2021) or hidden in the halo (e.g., Ibata et al 1994;Newberg et al 2009;Law & Majewski 2010;Grillmair & Carlin 2016;Helmi et al 2018;Zhao et al 2020;Ibata et al 2021;Yang et al 2022c;Mateu 2023). Identifying and studying them can help us better understand the current status as well as the past story of our Galaxy, which is especially true for stellar streams formed from the disruption of satellite galaxies.…”

Section: Introductionmentioning

confidence: 99%

A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream

Yang

Zhao²,

et al. 2023

ApJL

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We report the discovery of a new stream (dubbed as Yangtze) detected in Gaia Data Release 3. The stream is at a heliocentric distance of ∼9.12 kpc and spans nearly 27° by 1.°9 on the sky. The color–magnitude diagram of Yangtze indicates a stellar population of age ∼11 Gyr and [M/H] ∼ −0.7 dex. It has a number density of about 5.5 stars deg−2 along with a surface brightness of Σ G ≃ 34.9 mag arcsec−2. The dynamics and metallicity estimate suggest that Yangtze may be closely related to Palomar 1 and the Anticenter Stream.

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Section: Introductionmentioning

confidence: 99%

A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream

Yang

Zhao²,

et al. 2023

ApJL

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“…Specifically, studying the Galactic disk reveals kinematic substructures (e.g., Zhao et al 2009Zhao et al , 2018Liang et al 2017;Antoja et al 2018;Yang et al 2021), streams embedded in the disk (e.g., Necib et al 2020;Re Fiorentin et al 2021;Ye et al 2021), dynamic connections between the inner and outer disk (e.g., Zhang et al 2021;Chen et al 2022), imprints from merger events (e.g., Wu et al 2023), and so on. Focusing on the Galactic halo disentangles plentiful stellar streams (e.g., Grillmair & Carlin 2016;Shipp et al 2018;Thomas et al 2020;Zhao et al 2020;Ibata et al 2021;Yang et al 2022cYang et al , 2023, merger history (e.g., Ibata et al 1994;Helmi et al 2018;Malhan et al 2022), dark matter mass (e.g., Xue et al 2008;Bird et al 2022), etc. In this work, we concentrate on stellar streams as one type of important material probing the Milky Way's structure and evolution.…”

Section: Introductionmentioning

confidence: 99%

The Spectacular Tidal Tails of Globular Cluster M3 (NGC 5272)

Yang,

Zhao,

Tang

et al. 2023

ApJ

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We provide a detailed analysis of the tidal tails of the globular cluster M3 (NGC 5272). We first discover clear extratidal structures with a slight S shape near the cluster. This inspires us to examine the existence of its long tidal tails. We highlight potential stream stars using the proper motions (PMs) of a model stream combined with the cluster’s locus in a color–magnitude diagram (CMD). A 35° long leading tail and a 21° long trailing tail are successfully detected at the same time. Their corresponding overdensities can be recognized in CMD and PM space after subtracting the background. We estimate the stream width, star number density, and surface brightness for both tails, as well as the distance variation along the entire stream. We then verify the connection of M3 and the Svöl stream. Finally, we tabulate 11 member stars belonging to the M3 tidal stream with available spectroscopic observations.

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Charting the Galactic Acceleration Field. II. A Global Mass Model of the Milky Way from the STREAMFINDER Atlas of Stellar Streams Detected in Gaia DR3

Ibata,

Malhan,

Tenachi

et al. 2024

ApJ

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We present an atlas and follow-up spectroscopic observations of 87 thin stream-like structures detected with the STREAMFINDER algorithm in Gaia DR3, of which 28 are new discoveries. Here, we focus on using these streams to refine mass models of the Galaxy. Fits with a double-power-law halo with the outer power-law slope set to −β h = −3 yield an inner power-law slope of − γ h = - ( 0.97 − 0.21 + 0.17 ) , a scale radius of r 0 , h = 14.7 − 1.0 + 4.7 kpc , a halo density flattening q m,h = 0.75 ± 0.03, and a local dark matter density of ρ h,⊙ = 0.0114 ± 0.0007 M ⊙ pc−3. Freeing β yields β = 2.53 − 0.16 + 0.42 , but this value is heavily influenced by our chosen virial mass limit. The stellar disks are found to have a combined mass of 4.20 − 0.53 + 0.44 × 10 10 M ⊙ , with the thick disk contributing 12.4% ± 0.7% to the local stellar surface density. The scale lengths of the thin and thick disks are 2.17 − 0.08 + 0.18 and 1.62 − 0.13 + 0.72 kpc , respectively, while their scale heights are 0.347 − 0.010 + 0.007 and 0.86 − 0.02 + 0.03 kpc , respectively. The virial mass of the favored model is M 200 = 1.09 − 0.14 + 0.19 × 10 12 M ⊙ , while the mass inside of 50 kpc is M R<50 = 0.46 ± 0.03 × 1012 M ⊙. We introduce the Large Magellanic Cloud (LMC) into the derived potential models, and fit the Orphan stream therein, finding a mass for the LMC that is consistent with recent estimates. Some salient highlights include the nearby trailing arm of ω Cen, and a nearby very metal-poor stream that was once a satellite of the Sagittarius dwarf galaxy. Finally, we unambiguously detect a hot component around the GD-1 stream, consistent with it having been tidally preprocessed within its own dark matter subhalo.

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A New Cold Stream near the Southern Galactic Pole

Cited by 3 publications

References 46 publications

A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream

A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream

The Spectacular Tidal Tails of Globular Cluster M3 (NGC 5272)

Charting the Galactic Acceleration Field. II. A Global Mass Model of the Milky Way from the STREAMFINDER Atlas of Stellar Streams Detected in Gaia DR3

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