| Description | Arp 182 displays two faint filaments extending from what otherwise appears to be an intact spiral galaxy (NGC 7674) with a very close companion, and a second spiral much further away (NGC 7675) but likely gravitationally bound to it. Arp calls out the first filament in his remarks: "Long straight, very faint filament like bow wave from comp[anion]." If you imagine that the companion galaxy is a motorboat headed NW (up, left) to pass 7674 on its starboard bow, the "bow wave" leaves a triangular wake behind it. This is an extremely subtle, progressively widening, triangular filament. I believe it's more clear when I render Arp's plate as a positive [image 2 in gallery]. You see both Arp renderings in comparison to my positive image, which, frankly, does not show it. However, gallery image 3 is a negative (invert) of my capture, which does, particularly the southern side of the wake which appears to connect to NGC 7475 (and likely evidence of gravitational interaction). . Much more obvious in my inverted rendering is a semi-circular filament extending NE from 7674 (to the left and up), likely an extension of its bottom, spiral arm. |
