Cosmic Red Dot Cocoon Simulator JWST Early BH Seeds

2D Spatial Ray Diffusion & Cocoon Cross-Section

Click canvas to inject photon burst
Scale: Center BH accretion disk → Trapping zone → Dense H Shroud → Photosphere

Physical Shroud Parameters

BH Seed Mass (M⊙)106.0
Accretion Rate (× Eddington)4.20 ×
Cocoon Radius (AU)120 AU
Hydrogen Gas Density (cm-3)1.0 × 109
Cosmological Redshift (z)z = 7.50
Classification: Optically Thick Super-Eddington Cocoon
High optical depth (τ > 1) traps intrinsic UV/X-rays, thermalizing radiation into a bright, solar-system-scale red photosphere.
Thomson Optical Depth (τ)
48.60
> 1: Highly Shrouded / Trapping
Total Bolometric Luminosity
5.3e+44 erg/s
Super-Eddington regime
Effective Photosphere Temp
4200 K
Warm Optical / Rest-frame Peak
Stellar Brightness Ratio
1.2e+11 ×
vs. Physical Massive Star Limit

Spectral Energy Distribution (SED)

Observed Peak: 3.80 μm (JWST NIRCam/MIRI)
Intrinsic Accretion Disc (UV/X-ray)
Rest-Frame Thermalized Cocoon
Observed JWST Frame (Redshifted)

Astrophysical Diagnostics & Balmer Wings

Trapped super-Eddington accretion creates turbulent electron scattering producing extremely broad Hα / Hβ emission lines with full-width-at-half-maximum > 2,500 km/s.

Photon Diffusion Timescale: 3.4 days Photon Trapping Radius: 18.5 AU
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