An intriguing young-looking dwarf galaxy

The bright streak of glowing gas and stars in this NASA/ESA Hubble Space Telescope image is known as PGC 51017, or SBSG 1415+437. It is type of galaxy known as a blue compact dwarf.

This particular dwarf is well studied and has an interesting star formation history. Astronomers initially thought that SBS 1415+437 was a very young galaxy currently undergoing its very first burst of star formation, but more recent studies have suggested that the galaxy is in fact a little older, containing stars over 1.3 billion years old.

Starbursts are an area of ongoing research for astronomers — short-lived and intense periods of star formation, during which huge amounts of gas within a galaxy are hungrily used up to form newborn stars.

They have been seen in gas-rich disc galaxies, and in some lower-mass dwarfs. However, it is still unclear whether all dwarf galaxies experience starbursts as part of their evolution. It is possible that dwarf galaxies undergo a star formation cycle, with bursts occurring repeatedly over time.

SBS 1415+437 is an interesting target for another reason. Dwarf galaxies like this are thought to have formed early in the Universe, producing some of the very first stars before merging together to create more massive galaxies. Dwarf galaxies which contain very few of the heavier elements formed from having several generations of stars, like SBS 1415+437, remain some of the best places to study star-forming processes similar to those thought to occur in the early Universe. However, it seems that our nearby patch of the Universe may not contain any galaxies that are currently undergoing their first burst of star formation.

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

Credit:

ESA/Hubble & NASA
Acknowledgement: Alessandra Aloisi (STScI) and Nick Rose

About the Image

Id:potw1511a
Type:Observation
Release date:16 March 2015, 10:00
Size:4044 x 1968 px

About the Object

Name:PGC 51017
Type:Local Universe : Galaxy : Size : Dwarf
Distance:45 million light years
Constellation:Bootes
Category:Galaxies

Image Formats

Large JPEG
4.5 MB
Screensize JPEG
142.2 KB

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Wallpapers

1024x768
384.7 KB
1280x1024
730.8 KB
1600x1200
1.1 MB
1920x1200
1.3 MB
2048x1536
1.9 MB

Coordinates

Position (RA):14 17 1.71
Position (Dec):43° 30' 23.45"
Field of view:3.37 x 1.64 arcminutes
Orientation:North is 75.7° left of vertical

Colours & filters

BandWavelengthTelescope
Optical
V
606 nm Hubble Space Telescope
ACS
Infrared
I
814 nm Hubble Space Telescope
ACS
Optical
H-alpha
658 nm Hubble Space Telescope
ACS

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