interacting galaxies Two, three, or (more rarely) four or more galaxies that show signs of mutual disturbance, such as perturbed morphologies or extruded filaments of stellar material, called tidal tails, which can sometimes link to form bridges between the galaxies. Infrared spectroscopy and photometry and optical spectroscopy of the exceedingly luminous interacting galaxies Arp 220 (= IC 4553) and NGC 6240 are presented. Almost all of its power output (99 percent) is emitted at far-infrared wavelengths.

Hubble Interacting Galaxy Arp 220 (2008-04-24).jpg 3,372 × 3,372; 7.02 MB SEDApr220.png 1,123 × 794; 60 KB The merging galaxy system Arp 220 from ALMA and Hubble.jpg 955 × 692; 166 KB • The LRIGs contribute with <6% of the total FIR emission in the local universe. This interacting galaxy duo is collectively called Arp 142. This image is part of a large collection of 59 images of merging galaxies taken by the Hubble Space Telescope and released on the occasion of its 18th anniversary on 24 April 2008. This list may not reflect recent changes (). Arp 220 appears to be a single, odd-looking galaxy, but is in fact a nearby example of the aftermath of a collision between two spiral galaxies. Galaxies with adjacent loops: Arp 215 - 220 Galaxies with amorphous spiral arms: Arp 221 - 226 Galaxies with concentric rings: Arp 227 - 232 Galaxies with the appearance of fission: Arp 233 - 256 Galaxies with irregular clumps: Arp 257 - 268 Double and multiple galaxies Galaxies with connected arms: Arp 269 - 274 Interacting galaxies: Arp 275 - 280 Arp 220 is the 220th galaxy in Arp's Atlas of Peculiar Galaxies. It is the brightest of the three galactic mergers closest to Earth, about 250 million light-years away in the constellation of Serpens, the Serpent. Arp 220 is 100 times more luminous than normal spiral galaxies, with power output equal to that of distant quasars, equivalent to 2 trillion suns. Once part of a flat, spiral disk, the orbits of the galaxy’s stars have become scrambled due to gravitational tidal interactions with the other galaxy. The galaxy is a nearby example of the aftermath of two colliding galaxies. Arp 220 appears to be a single, odd-looking galaxy, but is in fact a nearby example of the aftermath of a collision between two spiral galaxies. Arp 220, a merging pair of galaxies with characteristic tidal tails, is only 75Mpcaway,givingusaclose-upviewofaULIRG.Itismaking ∼200M# yr−1 of new stars, but only a few percent of their light escapes directly.

The merging process in Arp 220, however, is farther along than in the Antennae. Examples include the Antennae, Arp 220 and the Mice. It is receding from us at about 5434 kilometers per second. In fact, said Wilson, one cannot even see the two galaxies that combined to make up Arp 220.

de Virginia) Indeed the only LIRG we find is Arp 220. • The frequency of mergers increases with Arp 220 shares a kinship with other interacting galaxies, such as the well-known Antennae galaxies. Happy Birthday Hubble. The maximum of the infrared energy distribution can now clearly be determined.