English

Update on Dusty Sources and Candidate Young Stellar Objects in the S-cluster

Astrophysics of Galaxies 2024-12-18 v1

Abstract

The Galactic Center provides a unique opportunity to observe a galactic core, objects in close proximity to a supermassive black hole (SMBH), and star formation channels that exhibit imprints of this peculiar environment. This habitat hosts, in addition to the SMBH Sgr A*, a surprisingly young cluster with the so-called S-stars. These stars orbit the SMBH on timescales of a few years with thousands of km/s. While the presence of high-velocity stars in the S-cluster already raises a variety of scientific questions, the observation of several bright L-band emission sources has resulted in a rich discussion of their nature. The detection of a prominent Doppler-shifted Brγ\gamma line accompanies most of these sources that seem to be embedded in a dusty envelope. Using the radiative-transfer model HYPERION, we find strong indications of the presence of a stellar low-mass population embedded in the S-cluster. We revisit this intriguing cluster and its dusty members that orbit the supermassive black hole Sgr A* on bound Keplerian trajectories. Among these cluster members, there is one source that initiated the studies of this analysis: G1. We find that the flux density of G1 in the NIR and MIR resembles a spectral energy distribution of a Class I YSO, which contributes to the "Paradox of Youth".

Keywords

Cite

@article{arxiv.2412.12917,
  title  = {Update on Dusty Sources and Candidate Young Stellar Objects in the S-cluster},
  author = {Maria Melamed and Florian Peißker},
  journal= {arXiv preprint arXiv:2412.12917},
  year   = {2024}
}

Comments

11 pages, 6 figures; an accepted contribution for the 17th Marcel Grossmann Meeting proceedings (invited talk at the session 'Latest results from Galactic center observations')

R2 v1 2026-06-28T20:38:53.069Z