IRS 13 Cluster Winds Carved Mini-Cavity ~300 Years Ago via Orbital Passage Through Bar
The mini-cavity is attributed to IRS 13 stellar winds during a past orbital crossing of the mini-spiral Bar. Momentum balance and X-ray flare timing both align with a ~300-year-old event. Analytic estimates leave room for hydrodynamical verification.
The paper performs order-of-magnitude wind momentum and ram-pressure calculations using published stellar parameters for IRS 13 members and the measured gas density in the mini-spiral. Orbital back-integration places the cluster inside the Bar at the required epoch, after which proper motions carry the stars to their present offset location. No current in-situ star is needed once the time-dependent geometry is included.
Contextual analysis reveals consistency with the light-travel-time delays of reflected X-ray flares observed in Sgr B2 and other clouds, implying transient accretion onto a putative intermediate-mass black hole within IRS 13 reached ~10^39 erg/s. This links the mechanical carving event directly to the episodic accretion history inferred from molecular-cloud echoes.
The principal limitation remains the analytic treatment of wind–ISM coupling and the assumed cluster orbit; full 3-D hydrodynamical simulations with updated Gaia-level proper motions would tighten the timing and energy budget. Upcoming JWST and Chandra monitoring can test whether residual wind signatures or renewed flare activity appear at the predicted orbital phase.
Future proper-motion refinements from GRAVITY+ will either confirm or falsify the 300-year transit window within the next five years.
GRAVITY+: Refined IRS 13 proper motions will shift the calculated transit epoch by more than 50 years or confirm it within 10 percent by 2029.
Sources (2)
- [1]Primary Source(https://arxiv.org/abs/2606.17131)
- [2]Supporting Source(https://ui.adsabs.harvard.edu/abs/2022ApJ...925..129P)