One galaxy, three supernovae

In astronomy, the devil is in the details — as this image, taken by the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys and Wide-Field Camera 3, demonstrates.

The numerous fuzzy blobs and glowing shapes scattered across this image make up a galaxy cluster named RXC J0949.8+1707. Located to the upper right of the frame sits an especially beautiful and interesting barred spiral galaxy, seen face-on. In the past decade, astronomers peering at this galaxy have possibly discovered not one but three examples of a cosmic phenomenon known as a supernova, the magnificently bright explosion of a star nearing the end of its life.

The newest supernova candidate is nicknamed SN Antikythera, and can be seen to the lower right  of the host galaxy. This shone brightly in visible and infrared light over a number of years before fading slightly. The two other supernovae, nicknamed SN Eleanor and SN Alexander, were present in data collected in 2011 but are not visible in this image, which was taken a few years later — their temporary nature unambiguously confirmed their status as supernovae. If future observations of RXC J0949.8+1707 show SN Antikythera to have disappeared then we can most likely label it a supernova, as with its two older (and now absent from the images) siblings.

This image was taken as part of an observing programme called RELICS (Reionization Lensing Cluster Survey). RELICS imaged 41 massive galaxy clusters with the aim of finding the brightest distant galaxies for the forthcoming NASA/ESA/CSA James Webb Space Telescope (JWST) to study.

Credit:

ESA/Hubble & NASA, RELICS

About the Image

Id:potw1825a
Type:Observation
Release date:18 June 2018, 06:00
Size:4247 x 3679 px

About the Object

Name:RXC J0949.8+1707
Type:Early Universe : Star : Evolutionary Stage : Supernova
Early Universe : Galaxy : Grouping : Cluster
Constellation:Leo
Category:Galaxies

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4.1 MB
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194.7 KB

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Coordinates

Position (RA):9 49 51.57
Position (Dec):17° 7' 10.73"
Field of view:2.12 x 1.84 arcminutes
Orientation:North is 17.6° left of vertical

Colours & filters

BandWavelengthTelescope
Optical
V
606 nm Hubble Space Telescope
ACS
Optical
B
435 nm Hubble Space Telescope
ACS
Optical
I
814 nm Hubble Space Telescope
ACS
Infrared
Z
1.05 μm Hubble Space Telescope
WFC3
Infrared
H
1.6 μm Hubble Space Telescope
WFC3
Infrared
J/H
1.4 μm Hubble Space Telescope
WFC3
Infrared
J
1.25 μm Hubble Space Telescope
WFC3

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