Arp Classifications of Peculiar Galaxies

Arp SPIRAL GALAXIES: Examples
1-6Low surface brightness NGC 2537
7-12Split armNGC 2523
13-18Detached segments NGC 4088, NGC 7314
19-21Three-armedNGC 145
22-24One-armedNGC 4027, NGC 4618
25-30One heavy armM101, NGC 6946
31-36Integral signNGC 4615
SPIRALS WITH COMPANIONS ON ARMS:
37-48Low surface brightness companions M77, NGC 1232
49-78Small, high surface brightness companions M90, NGC 1097
79-91Large, high surface brightness companions M51, NGC 5395
92-101Elliptical companions NGC 3227, Hickson 93
ELLIPTICAL GALAXIES:
102-108Connected to spirals NGC 5218
109-112Repelling spiral arms NGC 7805
113-132Close to & perturbing spirals M60, NGC 2300
133-136With nearby fragments M49, NGC 1023
137-145Material emanating from E galaxies NGC 275, NGC 2444
GALAXIES:
146-148With associated rings IC 298
149-152With jetsM87
153-160Disturbed with Interior Absorption NGC 5128, NGC 520
161-166With diffuse filaments NGC 3414, NGC 750
167-172Diffuse counter-tails NGC 2672, NGC 5718
173-178Narrow counter-tails NGC 5613, NGC 4933
179-193Narrow filaments NGC 4651, NGC 6217
194-208Material ejected from nucleus NGC 3432, NGC 5544
209-214Irregularities, absorption & resolution NGC 1569, NGC 7625
215-220Adjacent loops NGC 2782, NGC 3310
221-226Amorphous spiral arms NGC 2655, NGC 7727
227-231Concentric rings NGC 474, NGC 508
232-256Appearance of Fission NGC 4038, NGC 4676
257-268Irregular clumps NGC 3239, NGC 4861
DOUBLE GALAXIES:
269-274Connected arms NGC 4490, NGC 3395
275-280InteractingNGC 3769, NGC 1253
281-286Infall & attraction NGC 4631, NGC 5566
287-292Wind effectsNGC 3981, IC 195
294-297Long filaments NGC 3786, NGC 3690
311-321Groups of galaxies M66, Hickson 44
322-332Chains of galaxies Hickson 55, Hickson 56