A mysterious hermit

The drizzle of stars scattered across this image forms a galaxy known as UGC 4879. UGC 4879 is an irregular dwarf galaxy — as the name suggests, galaxies of this type are a little smaller and messier than their cosmic cousins, lacking the majestic swirl of a spiral or the coherence of an elliptical.

This galaxy is also very isolated. There are about 2.3 million light years between UGC 4879 and its closest neighbour, Leo A, which is about the same distance as that between the Andromeda Galaxy and the Milky Way.

This galaxy’s isolation means that it has not interacted with any surrounding galaxies, making it an ideal laboratory for studying star formation uncomplicated by interactions with other galaxies. Studies of UGC 4879 have revealed a significant amount of star formation in the first 4-billion-years after the Big Bang, followed by a strange nine-billion-year lull in star formation, ended 1-billion-years ago by a more recent reignition. The reason for this behaviour, however, remains mysterious, and the solitary galaxy continues to provide ample study material for astronomers looking to understand the complex mysteries of starbirth throughout the Universe.

Credit:

NASA & ESA

About the Image

Id:potw1623a
Type:Observation
Release date:6 June 2016, 06:00
Size:3986 x 2964 px

About the Object

Name:UGC 4879
Type:Local Universe : Galaxy : Type : Irregular
Local Universe : Galaxy : Size : Dwarf
Distance:4 million light years
Constellation:Ursa Major
Category:Galaxies

Image Formats

Large JPEG
5.5 MB
Screensize JPEG
365.0 KB

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346.2 KB
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626.1 KB
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936.1 KB
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1.2 MB
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1.6 MB

Coordinates

Position (RA):9 16 1.43
Position (Dec):52° 50' 54.42"
Field of view:3.32 x 2.47 arcminutes
Orientation:North is 156.6° right of vertical

Colours & filters

BandWavelengthTelescope
Optical606 nm Hubble Space Telescope
ACS
Optical606 nm Hubble Space Telescope
ACS
Optical814 nm Hubble Space Telescope
ACS
Optical814 nm Hubble Space Telescope
ACS

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