The Fingerprint of Dark Matter
165 real galaxies · SPARC rotation curves
This is real measured data — not a simulation. For each galaxy we plot how fast it actually spins
(Vobs, from Doppler shifts) against how fast the visible
matter — gas, stars, bulge — could ever make it spin. The stars should fall off at the edge like planets past
Neptune. They don't. The gap is pull with no light behind it: dark matter.
across all galaxies, the outer spin is on average unexplained by visible matter
Vobs — measured spin
Vbar — visible matter
dark-matter gap
How the gap is computed (honest, standard). V
bar is the Newtonian speed from the measured gas + stellar mass:
V_bar² = Vgas·|Vgas| + 0.5·Vdisk² + 0.7·Vbul² (the 0.5/0.7 are standard 3.6µm mass-to-light ratios). The dark-matter
curve is simply
√(V_obs² − V_bar²). No fitting.
An honest alternative exists —
MOND reads the same gap as
modified gravity rather than unseen mass; SPARC is a battleground for both. Either way the
data is real and the discrepancy
is undeniable.
Where this meets our model. In Manny's picture the gap is where matter/energy geodesics get too
cluttered to carry a
clean luminous label — the
noise / dark-matter pole made of real starlight's shortfall. The same data forms
the
Radial Acceleration Relation — the "clog threshold" — where the engine sorts these 165 galaxies into
free-flow / clogged regimes.
What's plotted here. The list above holds
16 representative galaxies drawn as full interactive curves — dwarfs to giants; the
70%-dark average spans the entire
165-galaxy sample (165 of the 175 galaxies in the SPARC catalog).
The Clog Threshold → · The Four Poles · Project Genesis · data: SPARC, Lelli et al. 2016