Exploring the origin of the distance bimodality of stars in the periphery of the Small Magellanic Cloud with APOGEE and Gaia

被引：3

作者：

Almeida, Andres ^{[1
]}

Majewski, Steven R. ^{[1
]}

Nidever, David L. ^{[2
]}

Olsen, Knut A. G. ^{[3
]}

Monachesi, Antonela ^{[4
,5
]}

Kallivayalil, Nitya ^{[1
]}

Hasselquist, Sten ^{[6
,7
]}

Choi, Yumi ^{[3
,8
]}

Povick, Joshua T. ^{[2
]}

Wilson, John C. ^{[1
]}

Geisler, Doug ^{[4
,5
,9
]}

Lane, Richard R. ^{[10
]}

Nitschelm, Christian ^{[11
]}

Sobeck, Jennifer S. ^{[12
]}

Stringfellow, Guy S. ^{[13
]}

机构：

[1] Univ Virginia, Dept Astron, POB 400325, Charlottesville, VA 22904 USA

[2] Montana State Univ, Dept Phys, POB 173840, Bozeman, MT 59717 USA

[3] NSFs Natl Opt Infrared Astron Res Lab, 950 N Cherry Ave, Tucson, AZ 85719 USA

[4] Univ La Serena, Inst Multidisciplinario Invest & Postgrad, Raul Bitran 1305, La Serena, Chile

[5] Univ La Serena, Dept Astron, Av Cisternas 1200, La Serena 1720169, Chile

[6] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[7] Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA

[8] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[9] Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion 4070409, Chile

[10] Univ Bernardo OHiggins, Ctr Invest Astron, Ave Viel 1497, Santiago 8370993, Chile

[11] Univ Antofagasta, Ctr Astron CITEVA, Ave Angamos 601, Antofagasta 1270300, Chile

[12] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[13] Univ Colorado, Ctr Astrophys & Space Astron, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 529卷 / 04期

基金：

美国国家科学基金会;

关键词：

surveys; galaxies: dwarf; galaxies: interactions; galaxies: abundances; galaxies: kinematics and dynamics; Magellanic Clouds; FINAL TARGETING STRATEGY; LARGE-SCALE STRUCTURE; PROPER-MOTION FIELD; DIGITAL SKY SURVEY; STELLAR POPULATIONS; VMC SURVEY; DATA RELEASE; 3-DIMENSIONAL STRUCTURE; FORMATION HISTORY; EDGES SURVEY;

D O I：

10.1093/mnras/stae373

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Magellanic Cloud system represents a unique laboratory for study of both interacting dwarf galaxies and the ongoing process of the formation of the Milky Way and its halo. We focus on one aspect of this complex, three-body interaction - the dynamical perturbation of the Small Magellanic Cloud (SMC) by the Large Magellanic Cloud (LMC), and specifically potential tidal effects on the SMC's eastern side. Using Gaia astrometry and the precise radial velocities (RVs) and multielement chemical abundances from Apache Point Observatory Galactic Evolution Experiment (APOGEE-2) Data Release 17, we explore the well-known distance bimodality on the eastern side of the SMC. Through estimated stellar distances, proper motions, and RVs, we characterize the kinematics of the two populations in the bimodality and compare their properties with those of SMC populations elsewhere. Moreover, while all regions explored by APOGEE seem to show a single chemical enrichment history, the metallicity distribution function (MDF), of the 'far' stars on the eastern periphery of the SMC is found to resemble that for the more metal-poor fields of the western periphery, whereas the MDF for the 'near' stars on the eastern periphery resembles that for stars in the SMC Centre. The closer eastern periphery stars also show RVs (corrected for SMC rotation and bulk motion) that are, on average, approaching us relative to all other SMC populations sampled. We interpret these trends as evidence that the near stars on the eastern side of the SMC represent material pulled out of the central SMC as part of its tidal interaction with the LMC.

引用

页码：3858 / 3876

页数：19

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