Young and dynamic

This NASA/ESA Hubble Space Telescope image shows an elliptical galaxy called NGC 2865. It lies just over 100 million light-years away from us in the constellation of Hydra — The Sea Serpent — and was discovered in 1835 by astronomer John Herschel.

Elliptical galaxies are usually filled with old, dying stars. NGC 2865, however, is relatively youthful and dynamic, with a rapidly rotating disc full of young stars and metal-rich gas. For an elliptical galaxy it contains an unusually high number of young stars — suggesting that a galaxy-wide starburst took place about one billion years ago.

The starburst itself was induced by a merger between a spiral galaxy, similar to our galaxy, the Milky Way, and an elliptical galaxy some three times more massive — the progenitor galaxy of NGC 2865. The new gas from the spiral galaxy revitalised the dying population of old stars in the elliptical galaxy, and several new generations of stars were born.

The faint halo surrounding the galaxy, visible in this image, is also a result of this merger. It consists of cold gas that was ripped away from the spiral galaxy during the merging process. The gas now forms an almost closed shell around its host galaxy.

A version of this image was entered into the Hubble’s Hidden Treasures image processing competition by contestant Judy Schmidt.

Link:

Credit:

ESA/Hubble & NASA
Acknowledgement: Judy Schmidt

About the Image

Id:potw1515a
Type:Observation
Release date:13 April 2015, 10:00
Size:4108 x 3952 px

About the Object

Name:NGC 2865
Type:Local Universe : Galaxy : Type : Elliptical
Distance:100 million light years
Constellation:Hydra
Category:Galaxies

Image Formats

Large JPEG
5.7 MB
Screensize JPEG
171.3 KB

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Coordinates

Position (RA):9 23 31.08
Position (Dec):-23° 9' 47.52"
Field of view:3.42 x 3.29 arcminutes
Orientation:North is 2.1° left of vertical

Colours & filters

BandWavelengthTelescope
Optical606 nm Hubble Space Telescope
ACS
Infrared814 nm Hubble Space Telescope
ACS

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