Messier 106 | |
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Observation data (J2000 epoch) | |
Constellation | Canes Venatici |
Right ascension | 12h 18m 57.5s[1] |
Declination | +47° 18′ 14″[1] |
Redshift | 448 ± 3 km/s[1] |
Distance | 23.7 ± 1.5 Mly (7 ± 0.5 Mpc)[2][3] |
Apparent magnitude (V) | 8.4[1] |
Characteristics | |
Type | SAB(s)bc[1] |
Size | 135,000 ly (in diameter)[4] |
Apparent size (V) | 18′.6 × 7′.2[1] |
Notable features | Megamaser galaxy,[5] Seyfert II galaxy.[6] |
Other designations | |
M 106, NGC 4258, UGC 7353, PGC 39600.[1][7] |
Messier 106 (also known as NGC 4258) is an intermediate spiral galaxy in the constellation Canes Venatici. It was discovered by Pierre Méchain in 1781. M106 is at a distance of about 22 to 25 million light-years away from Earth. M106 contains an active nucleus classified as a Type 2 Seyfert, and the presence of a central supermassive black hole has been demonstrated from radio-wavelength observations of the rotation of a disk of molecular gas orbiting within the inner light-year around the black hole.[8] NGC 4217 is a possible companion galaxy of Messier 106.[7] Besides the two visible arms, it has two "anomalous arms" detectable using an X-ray telescope.
Two supernovae have been observed in M106: SN 1981K (type II, mag. 17),[9] and SN 2014bc (type II, mag. 14.8).[10][11]
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