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Libralato, Mattia; Lennon, Daniel J; Bellini, Andrea; van der Marel, Roeland; Clark, J. Simon; Najarro, Francisco; Patrick, Lee R; Anderson, Jay; Bedin, Luigi R; Crowther, Paul A; de Mink, Selma E; Evans, Christopher J; Platais, Imants; Sabbi, Elena and Sohn, Sangmo Tony
(2021).
DOI: https://doi.org/10.1093/mnras/staa3329
Abstract
Abstract The presence of massive stars (MSs) in the region close to the Galactic Center (GC) poses several questions about their origin. The harsh environment of the GC favors specific formation scenarios, each of which should imprint characteristic kinematic features on the MSs. We present a 2D kinematic analysis of MSs in a GC region surrounding Sgr A* based on high-precision proper motions obtained with the Hubble Space Telescope. Thanks to a careful data reduction, well-measured bright stars in our proper-motion catalogs have errors better than 0.5 mas yr−1. We discuss the absolute motion of the MSs in the field and their motion relative to Sgr A*, the Arches and the Quintuplet. For the majority of the MSs, we rule out any distance further than 3–4 kpc from Sgr A* using only kinematic arguments. If their membership to the GC is confirmed, most of the isolated MSs are likely not associated with either the Arches or Quintuplet clusters or Sgr A*. Only a few MSs have proper motions suggesting they are likely members of the Arches cluster, in agreement with previous spectroscopic results. Line-of-sight radial velocities and distances are required to shed further light on the origin of most of these massive objects. We also present an analysis of other fast-moving objects in the GC region, finding no clear excess of high-velocity escaping stars. We make our astro-photometric catalogs publicly available.
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About
- Item ORO ID
- 73636
- Item Type
- Journal Item
- ISSN
- 1365-2966
- Keywords
- Galaxy: center – Galaxy: open clusters and associations: individual: Arches – Galaxy: open clusters and associations: individual: Quintuplet – Stars: massive stars – Proper motions
- Academic Unit or School
-
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM) - Copyright Holders
- © 2020 Mattia Libralato, © 2020 Daniel J Lennon, © 2020 Andrea Bellini, © 2020 Roeland van der Marel, © 2020 Simon J Clark, © 2020 Francisco Najarro, © 2020 Lee R Patrick, © 2020 Jay Anderson, © 2020 Luigi R Bedin, © 2020 Paul A Crowther, © 2020 Selma E de Mink, © 2020 Christopher J Evans, © 2020 Imants Platais, © 2020 Elena Sabbi, © 2020 Sangmo Tony Sohn
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