| NGC 3521 | |
|---|---|
 NGC 3521 imaged by theHubble Space Telescope | |
| Observation data (J2000epoch) | |
| 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 is aflocculent[4]intermediate spiral galaxy located in theconstellationLeo. Its velocity with respect to thecosmic microwave background is 1167 ± 26 km/s, which corresponds to aHubble distance of 56.1 ± 4.1 Mly (17.21 ± 1.26 Mpc).[1] However, 26non-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 astronomerWilliam Herschel on 22 February 1784.[6]
NGC 3521 has amorphological 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 lowellipticity and the galaxy is at a high inclination[2] of 72.7° to theline 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] Thenucleus of this galaxy is classified as an HII LINER,[8] as there is anH II region at the core and the nucleus forms alow-ionization nuclear emission-line region.
Onesupernova has been observed in NGC 3521: SN 2024aecx (type Ic, mag. 14.543) was discovered byATLAS on 16 December 2024.[9] Astronomers originally classified it astype IIb, but spectroscopy suggests this supernova is very similar toSN 1994I.[9]
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