Sequence

Sequence

There are four major types: F, G, L, E. Also there are transition types: FG, GL.
The sequence is based on how much gravity source affect the galaxy or how many mergers happend.
From F (Internal only), to G(Outer gravity causing DW), to L (merger in progress), to E(Eventual shape after mergers).

Flocculent Galaxy
"F" sequence is a Flocculent Galaxy. No outer force, thus the structure is based only rotation curve and SSPSF.
There are F0 to F7. The number represents Rotation Curve ID (see parameters page).

FG is the transition from F to G.

Grand Design Galaxy
The grand design comes from Density Wave, which is probably caused by nearby galaxy or something that have high gravity outside.
There G7 to G0. The number represents Rotation Curve ID (see parameters page).
"c" represents the size of bulge.
"dw5" means m=1 density wave + m=2 density wave

GL is the transition from G to L.

Lenticular Galaxy
L is cased by merger of galaxyes. Thus, less DW effect, and more strong halo density. Dust lane remain visible.
There are L0 to L7. The number represents mostly the density of halo, and amount of matters.

Elliptical Galaxy
Good old Elliptical Galaxy. The number represent the shape of the galaxy.
There are E7 to E0.
E0 is total round.

Detail
F0
F1
F2
F3
F4
F5
F6
F7
FG4Transition from F to G
FG5
FG6
FG7
G7
G6
G5
G4
G4c2
G4c2dw5
G3
G2 - BarredRC=2 generate Barred Galaxy
G1 - BarredRC=1 generate Barred Galaxy
G1c3
G0
G0c3
G0c5
GL3 Transition from G to L
GL2
GL1
L0
L1
L2
L3
L4
L5
L6
L7
E7
E5
E3
E1
E0