The Evaporating Massive Embedded Stellar Cluster IRS 13 Close to Sgr A*. II. Kinematic structure

Abstract

The existence of two distinct and apparently unrelated populations of dusty stellar objects in the Nuclear Stellar Cluster (NSC) of the Milky Way, namely IRS 13 and the S-cluster, are potentially prone to a general process describing the star formation history in the Galactic Center (GC). The former cluster is thought to be entangled in the clockwise and counterclockwise disks, a large-scale stellar distribution revealed by the analysis of stars at different distances from Sgr A*, the supermassive black hole in the GC. Recently, this large-scale distribution was reported to exhibit a multi-disk structure with at least four components. Motivated by this finding, we revisit the anisotropic IRS 13 cluster and find strong evidence for a disk-like structure. An examination of about 50 individual stellar orbits reveals a new structure that does not follow any trend known in the literature. Furthermore, we investigate the possibility of an inspiral cluster undergoing star formation processes, as proposed by several authors. Using a simplified N-body simulation to reproduce our observational results, we conclude that, under certain conditions, a massive cluster can migrate from the Circum Nuclear Disk toward the inner parsec. Based on this classification, we revisit the large-scale NACO (VLT) observations of IRS 13 and find evidence for a separation of the cluster into a gravitationally stable core remnant and a dissipating part. With the velocity-resolved H30α line and the broadband spectral energy distribution of IRS 13E3, we provide tentative support for the existence of an intermediate-mass black hole of ~ 3 x 10^26 M_sun surrounded by a hot gaseous stream.

41 pages, 26 figures, Accepted and published at the ApJ

References in corpus (36)

• Binary interaction dominates the evolution of massive stars
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• A multiphysics and multiscale software environment for modeling astrophysical systems
• Star Formation Around Super-Massive Black Holes
• Performance Analysis of Direct N-Body Algorithms on Special-Purpose Supercomputers
• Twelve years of spectroscopic monitoring in the Galactic Center: the closest look at S-stars near the black hole
• Simulations of the formation of stellar discs in the Galactic centre via cloud-cloud collisions
• A modular set of synthetic spectral energy distributions for young stellar objects
• On the Formation of Compact Stellar Disks Around Sgr A*
• Investigating the Relativistic Motion of the Stars Near the Supermassive Black Hole in the Galactic Center
• The Fate of Binaries in the Galactic Center: The Mundane and the Exotic
• S62 and S4711: Indications of a population of faint fast moving stars inside the S2 orbit -- S4711 on a 7.6 year orbit around Sgr~A*
• A Cool Accretion Disk around the Galactic Centre Black Hole
• S62 on a 9.9 yr Orbit around SgrA*
• The S-Star Cluster at the Center of the Milky Way: On the nature of diffuse NIR emission in the inner tenth of a parsec
• Kinematic Structure of the Galactic Center S-cluster
• The dark mass signature in the orbit of S2
• X-ray and IR Point Source Identification and Characteristics in the Embedded, Massive Star-Forming Region RCW 108
• IRS 13N: a new comoving group of sources at the Galactic Center
• Observation of S4716 -- a Star with a 4 yr Orbit around Sgr A*
• The Post-Periapse Evolution of Galactic Center Source G1: The second case of a resolved tidal interaction with a supermassive black hole
• The Second Galactic Center Black Hole?; A Possible Detection of Ionized Gas Orbiting around an IMBH embedded in the Galactic Center IRS13E complex
• Molecular Gas Feeding the Circumnuclear Disk of the Galactic Center
• Monitoring dusty sources in the vicinity of Sgr A*
• The evolutionary tracks of young massive star clusters
• The stellar correlation function from SDSS - A statistical search for wide binary stars
• M-Band Spectra of Dust Embedded Sources at the Galactic Center
• Colliding Winds in and around the Stellar Group IRS 13E at the Galactic Center
• Stellar Populations in the Central 0.5 pc of Our Galaxy III: The Dynamical Sub-structures
• Near- and mid-infrared observations in the inner tenth of a parsec of the Galactic center -- Detection of proper motion of a filament very close to Sgr~A*
• ALMA and VLA observations of emission from the environment of Sgr A*
• The apparent tail of the Galactic center object G2/DSO
• The Swansong of the Galactic Center Source X7: An Extreme Example of Tidal Evolution near the Supermassive Black Hole
• First observed interaction of the circumstellar envelope of an S-star with the environment of Sgr A*
• X3: a high-mass Young Stellar Object close to the supermassive black hole Sgr~A*

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• Discovery of a Dense Association of Stars in the Vicinity of the Supermassive Black Hole Sgr A*
• Closing the gap: Follow-up observations of peculiar dusty objects close to Sgr A* using ERIS
• Photometric Constraints on Intermediate-mass Black Holes in the Galactic Centre