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NGC 2146 (Barred Spiral Galaxy)


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NGC 2146
Barred Spiral Galaxy (棒渦巻銀河)
Gx SBab/P


別名 (Other names)
PGC 18797, UGC 3429, MCG 13-5-22

明るさ (Brightness)
10.5等級

星座 (Constellation)
きりん座 (Cam) (Camelopardalis)

距離 (Distance)

7,000万光年 (70 million light-years)

NGC 2146 is a barred spiral galaxy located 70 million light years from the Earth in the constellation Camelopardalis.

NGC 2146 (Barred Spiral Galaxy) : Picture

NGC 2146 (Barred Spiral Galaxy)
NGC 2146 (Barred Spiral Galaxy)
(C) Peter Lipscomb/Flynn Haase/NOAO/AURA/NSF
Located in Camelopardis, this galaxy has been violently perturbed by an interaction with a nearby galaxy. This is an example of a "peculiar galaxy" and is a strong source of radio emission. It is believed to be in the final stages of a collision and merger and may be interacting with NGC2146A, which lies 18 arc-minutes away.

NGC 2146 (Barred Spiral Galaxy)
NGC 2146 (Barred Spiral Galaxy)
(C) NASA/ESA/Hubble
A galaxy being stretched out of shape has been imaged by the NASA/ESA Hubble Space Telescope. Known as NGC 2146, it has been severely warped and deformed so that an immense dusty arm of glittering material now lies directly in front of the centre of the galaxy, as seen in the image.

NGC 2146 is classified as a barred spiral due to its shape, but the most distinctive feature is the dusty spiral arm that has looped in front of the galaxy's core as seen from our perspective. The forces required to pull this structure out of its natural shape and twist it up to 45 degrees are colossal. The most likely explanation is that a neighbouring galaxy is gravitationally perturbing it and distorting the orbits of many of NGC 2146’s stars. It is probable that we are currently witnessing the end stages of a process which has been occurring for tens of millions of years.

NCG 2146 is undergoing intense bouts of star formation, to such an extent that it is referred to as a starburst galaxy. This is a common state for barred spirals, but the extra gravitational disruption that NGC 2146 is enduring no doubt exacerbates the situation, compressing hydrogen-rich nebulae and triggering stellar birth.

Measuring about 80,000 light-years from end to end, NGC 2146 is slightly smaller than the Milky Way. It lies approximately 70 million light-years distant in the faint northern constellation of Camelopardalis. Although it is fairly easy to see with a moderate-sized telescope as a faint elongated blur of light it was not spotted until 1876 when the German astronomer Friedrich Winnecke found it visually using just a 16 cm telescope.

NGC 2146 NGC 2146
NGC 2146 (Barred Spiral Galaxy)
(C) NOAO
NGC 2146 (Barred Spiral Galaxy)
(C) NASA/ESA/Hubble
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