Candidate Young Stellar Objects in the S-cluster: The Kinematic Analysis of a Sub-population of the Low-mass G-objects close to Sgr A*

Abstract

The observation of several L-band emission sources in the S cluster has led to a rich discussion of their nature. However, a definitive answer to the classification of the dusty objects requires an explanation for the detection of compact Doppler-shifted Br$\gamma$ emission. The ionized hydrogen in combination with the observation of mid-infrared $L$-band continuum emission suggests that most of these sources are embedded in a dusty envelope. These embedded sources are part of the S-cluster, and their relationship to the S-stars is still under debate. Until now, the question of the origin of these two populations is vague, although all explanations favor migration processes for the individual cluster members. This work revisits the S-cluster and its dusty members orbiting the supermassive black hole Sgr~A* on bound Keplerian orbits from a kinematic perspective. The aim is to explore the Keplerian parameters for patterns that might imply a non-random distribution of the sample. Additionally, various analytical aspects are considered to address the nature of the dusty sources. Based on the photometric analysis, we estimated the individual $H-K$ and $K-L$ colors for the source sample and compared the results to known cluster members. The classification revealed a noticeable contrast between the S-stars and the dusty sources. To fit the flux-density distribution, we utilized the radiative transfer code HYPERION and implemented a Young Stellar Object Class I model. We obtained the position angle from the Keplerian fit results, and additionally, we analyzed the distribution of the inclinations and the longitudes of the ascending node. The colors of the dusty sources suggest a stellar nature consistent with the spectral energy distribution in the near and mid-infrared domains.

36 pages, 32 figures, accepted and published by A&A

References in corpus (58)

• 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
• Physical Properties of Wolf-Rayet Stars
• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multi-wavelength Observations, Data Processing, and Calibration
• Star Formation Around Super-Massive Black Holes
• Galactic Centre stellar winds and Sgr A* accretion
• 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
• Tracing the young massive high-eccentricity binary system Theta 1 Orionis C through periastron passage
• A modular set of synthetic spectral energy distributions for young stellar objects
• Detection of Galactic Center source G2 at 3.8 $\mu$m during periapse passage
• The Milky Way's nuclear star cluster: Old, metal-rich, and cuspy
• The Galactic Center cloud G2 and its gas streamer
• The Fate of Binaries in the Galactic Center: The Mundane and the Exotic
• Investigating the Relativistic Motion of the Stars Near the Supermassive Black Hole in the Galactic Center
• 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*
• An upper limit on the spin of SgrA${}^{\ast }$ based on stellar orbits in its vicinity
• A population of dust-enshrouded objects orbiting the Galactic black hole
• Radio Continuum Observations of the Galactic Center: Photoevaporative Proplyd-like Objects near Sgr A*
• BRITE-Constellation high-precision time-dependent photometry of the early-O-type supergiant $\zeta$ Puppis unveils the photospheric drivers of its small- and large-scale wind structures
• Accretion of cool stellar winds on Sgr A*: another puzzle of the Galactic Centre?
• First proper motions of thin dust filaments at the Galactic Center
• Photometric Stellar Variability in the Galactic Center
• S62 on a 9.9 yr Orbit around SgrA*
• Monitoring the Dusty S-Cluster Object (DSO/G2) on its Orbit towards the Galactic Center Black Hole
• 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
• The Circumstellar Disk Mass Distribution in the Orion Trapezium Cluster
• [Fe II] and H2 filaments in the Supernova Remnant G11.2-0.3: Supernova Ejecta and Presupernova Circumstellar Wind
• Dusty Sources at the Galactic Center: The N- and Q-band view with VISIR
• Electron and Proton Heating in Transrelativistic Guide Field Reconnection
• 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
• Dust-enshrouded star near supermassive black hole: predictions for high-eccentricity passages near low-luminosity galactic nuclei
• On the behaviour of stellar winds that exceed the photon-tiring limit
• Monitoring dusty sources in the vicinity of Sgr A*
• ALMA Detection of Bipolar Outflows: Evidence for Low Mass Star Formation within 1pc of Sgr A*
• Detailed AGB evolutionary models and near infrared colours of intermediate-age stellar populations: Tests on star clusters
• Polarized near-infrared light of the Dusty S-cluster Object (DSO/G2) at the Galactic Center
• 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
• 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*
• Stellar Populations in the Central 0.5 pc of Our Galaxy III: The Dynamical Sub-structures
• Evidence of a Decreased Binary Fraction for Massive Stars Within 20 Milliparsecs of the Supermassive Black Hole at the Galactic Center
• The enigma of GCIRS 3 - Constraining the properties of the mid-infrared reference star of the central parsec of the Milky Way with optical long baseline interferometry
• A new bow-shock source with bipolar morphology in the vicinity of Sgr A*
• ALMA and VLA observations of emission from the environment of Sgr A*
• The apparent tail of the Galactic center object G2/DSO
• Scary Barbie: An Extremely Energetic, Long-Duration Tidal Disruption Event Candidate Without a Detected Host Galaxy at z = 0.995
• 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*
• Observation of the apoapsis of S62 in 2019 with NIRC2 and SINFONI
• The evolution of circumstellar discs in the Galactic Centre: an application to the G-clouds
• Upper Limit on Brackett-gamma Emission from the Immediate Accretion Flow onto the Galactic Black Hole
• X3: a high-mass Young Stellar Object close to the supermassive black hole Sgr~A*
• Mid-Infrared studies of dusty sources in the Galactic Center

Cited by in corpus (1)

• A binary system in the S cluster close to the supermassive black hole Sagittarius A*