NGC 5584
Galaxy in the constellation Virgo
From Wikipedia, the free encyclopedia
NGC 5584 is a barred spiral galaxy[8] in the constellation Virgo. It was discovered July 27, 1881 by American astronomer E. E. Barnard.[10] Distance determination using Cepheid variable measurements gives an estimate of 75 million light years,[6] whereas the tip of the red-giant branch approach yields a distance of 73.4 million light years.[7] It is receding with a heliocentric radial velocity of 1,637 km/s.[4] It is a member of the Virgo III Groups, a series of galaxies and galaxy clusters strung out to the east of the Virgo Supercluster of galaxies.[11]
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| NGC 5584 | |
|---|---|
| |
| Observation data (J2000 epoch) | |
| Constellation | Virgo |
| Right ascension | 14h 22m 3.811s[2] |
| Declination | −00° 23′ 14.82″[2] |
| Redshift | 0.005525[3] |
| Heliocentric radial velocity | 1,637 km/s[4] |
| Distance | 91.9 Mly (28.2 Mpc)[5] 75.0 Mly (23.01 Mpc)[6] 73.4 Mly (22.5 Mpc)[7] |
| Apparent magnitude (B) | 12.80 |
| Characteristics | |
| Type | SAB(rs)cd,[8] SA(s)cd[9] |
| Apparent size (V) | 1.320′ × 0.766′[2] |
| Other designations | |
| IRAS 14198-0009, 2MASX J14222381-0023148, NGC 5584, UGC 9201, LEDA 51344, MCG +00-37-001, SDSS J142223.76-002315.6[3] | |
The morphological class of NGC 5584 is SAB(rs)cd,[8] which indicates this spiral galaxy has an inner bar (SAB), an incomplete inner ring structure (rs), and loosely wound spiral arms (cd). It is flocculent in appearance with only a small nucleus. Star formation is occurring along the spiral arms.[8] The galactic plane is inclined at an angle of 42.4° to the line of sight from the Earth,[7] and it spans more than 50,000 light-years across.[12] 250 Cepheid variables have been observed in NGC 5584.[1]
Supernovae
Two supernovae have been observed in NGC 5584:
- SN 1996aq (Type Ic, mag. 15.7) was discovered by Masakatsu Aoki on 17 August 1996.[13][14] It was offset by 15″ west and 8″ south of the galactic center. It reached magnitude 14.7 on August 18.
- SN 2007af (type Ia, mag. 15.4) was discovered by Kōichi Itagaki on 24 February 2007, located at an offset 40″ west and 22″ of the galaxy's center.[15][16][17] A light echo of this event was observed about 1,000 days after its discovery.[18]
