NGC 3521
Galaxy in the constellation Leo From Wikipedia, the free encyclopedia
NGC 3521 is a flocculent[4] intermediate spiral galaxy located in the constellation Leo. Its velocity with respect to the cosmic microwave background is 1167 ± 26 km/s, which corresponds to a Hubble distance of 56.1 ± 4.1 Mly (17.21 ± 1.26 Mpc).[1] However, 26 non-redshift measurements give a much closer distance of 37.17 ± 1.83 Mly (11.395 ± 0.56 Mpc).[5] It was discovered by German-British astronomer William Herschel on 22 February 1784.[6]

NGC 3521 | |
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![]() NGC 3521 imaged by the Hubble Space Telescope | |
Observation data (J2000 epoch) | |
Constellation | Leo |
Right ascension | 11h 05m 48.581s[1] |
Declination | –00° 02′ 09.11″[1] |
Redshift | 0.002672[1] |
Heliocentric radial velocity | 801[2] km/s |
Distance | 37.17 ± 1.83 Mly (11.395 ± 0.56 Mpc)[1] |
Apparent magnitude (V) | 11.0[1] |
Characteristics | |
Type | SAB(rs)bc[2] |
Size | ~146,000 ly (44.75 kpc) (estimated)[1] |
Apparent size (V) | 11′.0 × 5′.1[1] |
Notable features | HII LINER |
Other designations | |
Bubble Galaxy[3], IRAS 11032+0014, UGC 6150, MCG +00-28-030, PGC 33550, CGCG 010-074[1] |
NGC 3521 has a morphological classification of SAB(rs)bc,[2] which indicates that it is a spiral galaxy with a trace of a bar structure (SAB), a weak inner ring (rs), and moderate to loosely wound arm structure (bc).[7] The bar structure is difficult to discern, both because it has a low ellipticity and the galaxy is at a high inclination[2] of 72.7° to the line of sight.[4] The relatively bright bulge is nearly 3/4 the size of the bar, which may indicate the former is quite massive.[2] The nucleus of this galaxy is classified as an HII LINER,[8] as there is an H II region at the core and the nucleus forms a low-ionization nuclear emission-line region.
NGC 3521 is structurally similar to the Milky Way; additionally, its supermassive black hole has a similar mass to that of the Milky Way, at about 7 million solar masses.[9]
Supernova
One supernova has been observed in NGC 3521: SN 2024aecx (type Ic, mag. 14.543) was discovered by ATLAS on 16 December 2024.[10] Astronomers originally classified it as type IIb, but spectroscopy suggests this supernova is very similar to SN 1994I.[10]
References
External links
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