SN Refsdal
 SN Refsdal (inset picture) and galaxy cluster MACS J1149.6+2223. Credit: Hubble/NASA/ESA/STScI/UCLA | |
| Event type | Supernova  |
|---|---|
| Unknown | |
| Date | 11 November 2014 Patrick Kelly (GLASS) |
| Constellation | Leo |
| Right ascension | 11h 49m 35.45s[1] |
| Declination | 22° 23′ 44.84″[1] |
| Epoch | J2000 |
| Distance | z=1.49[1] |
| Progenitor | unknown |
| Notable features | First multiply-lensed supernova |
 Related media on Commons | |
SN Refsdal is the first detected multiply-lensed supernova, visible within the field of the galaxy cluster MACS J1149+2223. It was given its nickname in honor of the Norwegian astrophysicist Sjur Refsdal, who, in 1964, first proposed using time-delayed images from a lensed supernova to study the expansion of the universe.[1][2][3] The observations were made using the Hubble Space Telescope.[4]
The host galaxy of SN Refsdal is at a redshift of 1.49, corresponding to a comoving distance of 14.4 billion light-years.[5] The multiple images are arranged around the elliptical galaxy at z = 0.54 in a cross-shaped pattern, also known an Einstein Cross.[1]
When the four images fade away, astronomers predict they will have the rare opportunity to see the supernova again. This is because the current four-image pattern is only one component of the lensing display. The supernova may have appeared as a single image some 40-50 years ago elsewhere in the cluster field, and it is expected to reappear once more in about a decade. The magnifications and staggered arrivals of the supernova images will help astronomers probe the cosmic expansion rate, as well as the distribution of matter and dark matter in the galaxy and cluster lenses.[1]
References
- ^ a b c d e f Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi: 10.1126/science.aaa3350, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with
|doi= 10.1126/science.aaa3350instead. - ^ Overbye, Dennis (March 5, 2015). "Astronomers Observe Supernova and Find They're Watching Reruns". New York Times. Retrieved March 5, 2015.
- ^ Amina Khan (5 March 2015). "Don't believe the light: Supernova in 'Einstein Cross' is a cosmic trick". Los Angeles Times.
- ^ Attention: This template ({{cite doi}}) is deprecated. To cite the publication identified by doi:10.1088/2041-8205/800/2/L26, please use {{cite journal}} (if it was published in a bona fide academic journal, otherwise {{cite report}} with
|doi=10.1088/2041-8205/800/2/L26instead. - ^ "Cosmological redshift z=1.49". Wolfram Alpha. Retrieved 11 March 2015.
See also
External links
- Images of SN Refsdal at hubblesite.org
- NASA’s Hubble Discovers Four Images of Same Supernova Split by Cosmic Lens - by NASA
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