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HCG 44 (Hickson Compact Group 44)


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HCG 44 (Hickson Compact Group 44)

距離 (Distance)
6,000万光年 (60 million light-years)

星座 (Constellation)
しし座 (Leo) (Leo)

HCG 44 (Hickson Compact Group 44) is an interacting galaxy located 60 million light years from the Earth in the constellation Leo.

HCG 44 (Hickson Compact Group 44) : Picture

Hickson 44 in Leo
Hickson 44 in Leo
(C) Stephen Leshin
Scanning the skies for galaxies, Canadian astronomer Paul Hickson and colleagues identified some 100 compact groups of galaxies, now appropriately called Hickson Compact Groups. The four prominent galaxies seen in this intriguing telescopic skyscape are one such group, Hickson 44, about 100 million light-years distant toward the constellation Leo. The two spiral galaxies in the center of the image are edge-on NGC 3190 with its distinctive, warped dust lanes, and S-shaped NGC 3187. Along with the bright elliptical, NGC 3193 at the right, they are also known as Arp 316. The spiral in the upper left corner is NGC 3185, the 4th member of the Hickson group. Like other galaxies in Hickson groups, these show signs of distortion and enhanced star formation, evidence of a gravitational tug of war that will eventually result in galaxy mergers on a cosmic timescale. The merger process is now understood to be a normal part of the evolution of galaxies, including our own Milky Way. For scale, NGC 3190 is about 75,000 light-years across at the estimated distance of Hickson 44.

Galaxy Group Hickson 44
Galaxy Group Hickson 44
(C) NASA
Galaxies, like stars, frequently form groups. A group of galaxies is a system containing more than two galaxies but less than the tens or hundreds typically found in a cluster of galaxies. A most notable example is the Local Group of Galaxies, which houses over 30 galaxies including our Milky Way, Andromeda, and the Magellanic Clouds. Pictured above is nearby compact group Hickson 44. This group is located about 60 million light-years away toward the constellation of Leo. Also known as the NGC 3190 Group, Hickson 44 contains several bright spiral galaxies and one bright elliptical galaxy on the upper left. The bright source on the upper right is a foreground star. Many galaxies in Hickson 44 and other compact groups are either slowly merging or gravitationally pulling each other apart.

NGC 3190 NGC 3185 (Spiral Galaxy)
NGC 3190
(C) NASA
NGC 3185 (Spiral Galaxy)
(C) NASA/ESA
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HCG 44 (Hickson Compact Group 44) : Movie

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