What astronomical object emerges sometimes from supernova instead of a black hole?

Magnetar
Blazar
Quasar
only a black hole can emerge from supernova
A magnetar is a type of neutron star with an extremely powerful magnetic field. The magnetic field decay powers the emission of high-energy electromagnetic radiation, particularly X-rays and gamma rays. As of March 2016, only 23 magnetars are known, with six more candidates awaiting confirmation.
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Answers by country

Magnetar
Blazar
Quasar
only a black hole can emerge from supernova
answers
flagPakistan
50%
5%
22%
22%
18
flagCanada
45%
0%
36%
18%
11
flagthe United States
43%
4%
36%
14%
101
flagAustria
40%
11%
25%
19%
52
flagAustralia
38%
4%
38%
14%
21
flagIndia
37%
11%
35%
14%
199
flagthe United Kingdom
37%
8%
38%
15%
59
flagGermany
35%
16%
23%
22%
375
flagPoland
29%
12%
39%
18%
3558
flagSwitzerland
27%
17%
13%
37%
29
flagLebanon
18%
12%
62%
6%
16
flagGreece
15%
15%
38%
30%
13
flagthe Netherlands
9%
0%
45%
45%
11