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26 April 2024 |
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Star Clusters in the Galactic Anticenter Stellar Structure and the Origin of Outer Old Open Clusters | | Peter M. Frinchaboy
; Steven R. Majewski
; Jeffrey D. Crane
; I. Neill Reid
; Helio J. Rocha-Pinto
; Randy L. Phelps
; Richard J. Patterson
; Ricardo R. Munoz
; | | Date: |
4 Nov 2003 | | Journal: | Astrophys.J. 602 (2004) L21-L24 | | Subject: | astro-ph | | Abstract: | The Galactic Anticenter Stellar Structure (GASS) has been identified with excess surface densities of field stars in several large area sky surveys, and with an unusual, string-like grouping of five globular clusters. At least two of these are diffuse, young ``transitional’’ clusters between open and globular types. Here we call attention to the fact that four {it younger} open or transitional clusters extend the previously identified, string-like cluster grouping, with at least one having a radial velocity consistent with the previously found GASS velocity-longitude trend. All nine clusters lie close to a plane tipped 17$arcdeg$ to the Galactic plane. This planar orientation is used to forage for additional potential cluster members in the inner Galaxy, and a number are found along the same plane and string-like sequence, {it including almost all fifteen known outer, old open clusters}. Tidal accretion of a dwarf satellite galaxy on a low inclination orbit -- perhaps the GASS system -- appears to be a plausible explanation for the origin of the outer, old open and transitional clusters of the Milky Way. We use these clusters to explore the age-metallicity relation of the putative accreted GASS progenitor. Finally, we provide the first radial velocity of a star in the cluster BH 176 and discuss its implications. | | Source: | arXiv, astro-ph/0311101 | | Services: | Forum | Review | PDF | Favorites | |
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