SDSS J081421.68+522410.0 | |
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Observation data (J2000.0 epoch) | |
Constellation | Lynx |
Right ascension | 08h 14m 21.68s |
Declination | +52° 24′ 10.08″ |
Redshift | 0.24674±0.00006 |
Heliocentric radial velocity | 73,969.90±17.69 km/s |
Galactocentric velocity | 74,013±18 km/s |
Distance | 3.5 billion light-years (1.1 Gpc) |
Apparent magnitude (V) | 17.16 |
Characteristics | |
Type | E (purported with 89% chance)[1] |
Mass | 2.4×1011 M☉ |
Size | 242,700 ly (74.40 kpc) (diameter; 25.0 r-mag/arcsec2) |
Notable features | Giant radio galaxy |
Other designations | |
Alcyoneus, 2MASS J08142169+5224103, WISEA J081421.70+522410.0 | |
References: [2] |
Alcyoneus is a low-excitation, Fanaroff–Riley class II radio galaxy located 3.5 billion light-years (1.1 gigaparsecs) from Earth, corresponding to the galaxy SDSS J081421.68+522410.0.[2] It is located in the constellation Lynx and it was discovered in Low-Frequency Array (LOFAR) data by a team of astronomers led by Martijn Oei. As of 2024 it has the second-largest extent of radio structure of any radio galaxy identified, with lobed structures spanning 5 megaparsecs (16 million light-years) across, described by its discoverers at the time as the "largest known structure of galactic origin."[1][a] It has since been superseded by another radio galaxy, SDSS J081956.41+323537.6, with lobed structures of 5.07 megaparsecs (16.5 million light-years).[3]
Aside from the size of its radio emissions, the central galaxy is otherwise of ordinary radio luminosity, stellar mass, and supermassive black hole mass. It is a standalone galaxy with an isophotal diameter at 25.0 r-mag/arcsec2 of about 242,700 light-years (74.40 kpc), with the nearest cluster located 11 million light years away from it.[1] The galaxy was named after the giant Alcyoneus from Greek mythology.[1]
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