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NGC 5665
Galaxy in the constellation Boötes From Wikipedia, the free encyclopedia
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NGC 5665 is a spiral galaxy in the northern constellation of Boötes. It was discovered on January 30, 1784 by German-British astronomer William Herschel.[8] This galaxy is located at a distance of 53.6 ± 7.7 million light-years (16.44 ± 2.37 Mpc),[3] and is receding with a heliocentric radial velocity of 2,237 km/s.[3] It is cataloged in Halton Arp's Atlas of Peculiar Galaxies as object number 49.[5]
The morphological classification of NGC 5665 is unclear and differs by author.[5] In the De Vaucouleurs system it was classified as SAB(rs)c pec?,[6] which indicates a weakly-barred spiral galaxy (SAB) with a transitional inner ring structure (rs), loosely wound spiral arms (c), and suspected peculiarities (pec?). The galactic plane is inclined at an angle of 53°±5° to the plane of the sky,[3] with the major axis aligned along a position angle of 145°.[5]
Evidence suggests that NGC 5665 underwent a gravitational interaction with another galaxy some 500 million years ago, swallowing a smaller companion.[5] It is somewhat asymmetrical in appearance,[6] retaining a single main spiral arm and the remains of several others. The galaxy is rich in dust and gas with a small bar at the center. There are numerous sites of star formation in the arm that match the age of the interaction.[5] The spectrum of the core is a blend between a LINER and an H II region.[6]
NGC 5665 is part of the Virgo-Libra Cloud,[9] which is part of the Virgo Supercluster.[10]
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