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(Redirected from Arp 23)
Distorted dwarf barred spiral galaxy in the constellation Canes Venatici
Unlike most spiral galaxies, NGC 4618 has a single spiral arm, which gives the galaxy an asymmetric appearance. This galaxy was included in the Atlas of Peculiar Galaxies as one of three examples of nearby galaxies with single spiral arms. Although NGC 4618 is labeled as peculiar, many similar galaxies have been identified.
It has been hypothesized that this galaxy's asymmetric structure may be the result of a gravitational interaction with NGC 4625. Such asymmetric structure is commonly seen among many interacting galaxies. However, observations of neutral hydrogen gas in NGC 4618 and NGC 4625 imply that only some of the gas outside the optical disks of NGC 4618 is affected by the gravitational interaction. This may indicate that NGC 4618's one-arm shape forms as the result of processes that are intrinsic to the galaxy itself.
R. W. Sinnott, ed. (1988). The Complete New General Catalogue and Index Catalogue of Nebulae and Star Clusters by J. L. E. Dreyer. Sky Publishing Corporation and Cambridge University Press. ISBN978-0-933346-51-2.
Filippenko, A. V.; Sargent, W. L. W. (1985). "Unusual Object in NGC 4618". International Astronomical Union Circular (4042): 1. Bibcode:1985IAUC.4042....1F.
"SN 1985F". Transient Name Server. IAU. Retrieved 5 December 2024.
Barred spiral galaxy NGC 4618 imaged by the Hubble Space Telescope
Media related to NGC 4618 at Wikimedia Commons
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