JWST Little Red Dots (LRDs) Spectrum Simulator & Diagnostic Workbench

JWST Target Field & Rest-Frame Spectral Line Profile

Drag crosshair on spectrum to inspect FWHM & rest wavelength

What are Little Red Dots (LRDs)?

Discovered by JWST at $z=4-10$, LRDs exhibit extremely compact physical radii ($<100\text{ pc}$) with distinct broad Balmer emission line wings ($V_{\text{FWHM}} > 3,000\text{ km/s}$) and steep red UV continuum slopes. Scientists actively debate whether these are over-massive accreting Supermassive Black Holes (SMBHs) or ultra-dense dust-reddened stellar clusters without active nuclei.

Astrophysical Model

Physical Mechanism Model

Redshift ($z$) 7.04

SMBH Mass ($\log M_{\text{BH}}/M_\odot$) 7.70

Dust Attenuation ($A_V$ mag) 2.50

Stellar Mass ($\log M_*/M_\odot$) 9.00

Calculated Diagnostic Metrics

Broad Hα FWHM Velocity 4,200 km/s

Virial BH Mass 5.0 × 10⁷ M☉

UV Slope (β) -0.20

Core Compactness < 150 pc

Observational Summary Record

Target Name: RUBIES-EGS-QSO-1

Redshift (z): 7.04

Broad Line FWHM: 4,200 km/s

Dust Attenuation A_V: 2.50 mag

Core Fit Assessment: SMBH AGN Favored