Arp Classifications of Peculiar Galaxies

Arp SPIRAL GALAXIES: Examples
1-6 Low surface brightness NGC 2537
7-12 Split arm NGC 2523
13-18 Detached segments NGC 4088, NGC 7314
19-21 Three-armed NGC 145
22-24 One-armed NGC 4027, NGC 4618
25-30 One heavy arm M101, NGC 6946
31-36 Integral sign NGC 4615
SPIRALS WITH COMPANIONS ON ARMS:
37-48 Low surface brightness companions M77, NGC 1232
49-78 Small, high surface brightness companions M90, NGC 1097
79-91 Large, high surface brightness companions M51, NGC 5395
92-101 Elliptical companions NGC 3227, Hickson 93
ELLIPTICAL GALAXIES:
102-108 Connected to spirals NGC 5218
109-112 Repelling spiral arms NGC 7805
113-132 Close to & perturbing spirals M60, NGC 2300
133-136 With nearby fragments M49, NGC 1023
137-145 Material emanating from E galaxies NGC 275, NGC 2444
GALAXIES:
146-148 With associated rings IC 298
149-152 With jets M87
153-160 Disturbed with Interior Absorption NGC 5128, NGC 520
161-166 With diffuse filaments NGC 3414, NGC 750
167-172 Diffuse counter-tails NGC 2672, NGC 5718
173-178 Narrow counter-tails NGC 5613, NGC 4933
179-193 Narrow filaments NGC 4651, NGC 6217
194-208 Material ejected from nucleus NGC 3432, NGC 5544
209-214 Irregularities, absorption & resolution NGC 1569, NGC 7625
215-220 Adjacent loops NGC 2782, NGC 3310
221-226 Amorphous spiral arms NGC 2655, NGC 7727
227-231 Concentric rings NGC 474, NGC 508
232-256 Appearance of Fission NGC 4038, NGC 4676
257-268 Irregular clumps NGC 3239, NGC 4861
DOUBLE GALAXIES:
269-274 Connected arms NGC 4490, NGC 3395
275-280 Interacting NGC 3769, NGC 1253
281-286 Infall & attraction NGC 4631, NGC 5566
287-292 Wind effects NGC 3981, IC 195
294-297 Long filaments NGC 3786, NGC 3690
311-321 Groups of galaxies M66, Hickson 44
322-332 Chains of galaxies Hickson 55, Hickson 56