ASASSN-15lh
2015 hypernova event in the constellation Indus / From Wikipedia, the free encyclopedia
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ASASSN-15lh (supernova designation SN 2015L) is an extremely luminous astronomical transient event discovered by the All Sky Automated Survey for SuperNovae (ASAS-SN), with the appearance of a superluminous supernova event. It was first detected on June 14, 2015, located within a faint galaxy in the southern constellation Indus, and was the most luminous supernova-like object ever observed.[4] At its peak, ASASSN-15lh was 570 billion times brighter than the Sun, and 20 times brighter than the combined light emitted by the Milky Way Galaxy.[4] The emitted energy was exceeded by PS1-10adi.
SLSNe (Type Ic), SNSLSN-I | |
Right ascension | 22h 2m 15.45s[2] |
---|---|
Declination | −61° 39′ 34.64″[2] |
Distance | 1,171 megaparsecs 3.82 gigalight-years |
Redshift | 0.2326 |
Host | APMUKS(BJ) B215839.70−615403.9[3] |
Peak apparent magnitude | 16.9 |
Other designations | SN 2015L |
The nature of ASASSN-15lh is disputed. The most popular explanations are that it is the most luminous type I supernova (hypernova) ever observed, or a tidal disruption event around a supermassive black hole. Other hypotheses include: gravitational lensing; a quark nova inside a Wolf–Rayet star; or a rapid magnetar spindown.