| 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 |
