6C 091740+445437
| 6C 091740+445437 | |
|---|---|
DESI Legacy DR10 image of 6C 091740+445437 | |
| Observation data (J2000 epoch) | |
| Constellation | Ursa Major |
| Right ascension | 09h 20m 58.46s |
| Declination | +44° 41' 53.99" |
| Redshift | 2.18786 |
| Heliocentric radial velocity | 246078 |
| Distance | 12.1 billion ly (3,710 mpc |
| Apparent magnitude (V) | 18.16 |
| Characteristics | |
| Type | FSRQ |
| Mass | 9.55 trillion M☉ |
| Size | 165,600 ly (50,760 pc) |
| Other designations | |
| B3 0917+449, QSO J0920+4441, INTREF 383 | |
6C 091740+445437 also known as B3 0917+449, is a blazar, flat-spectrum radio quasar, and radio galaxy in the constellation of Ursa Major.[1][2] The galaxy is at redshift z = 2.19, equal to roughly 12 billion light years (or 3,710 megaparsecs) away and it has a visual magnitude of 18.16.[1][2] The galaxy was first reported in literature in a 1993 survey of quasi-stellar objects.[3]
Physical properties
6C 091740+445437 is a massive, large galaxy that it is not a part of any galaxy clusters, classifying it as a field galaxy.[1][2] The galaxy is large with a size of approximately 166,000 light years (50,760 parsecs) across or about twice the size of the Milky Way, based on a SDSS isophotal angular diameter of 5.99 arcsecs and a 3K CMB redshift-corrected distance.[2] The galaxy is one of the most massive galaxies discovered.[4] It has an stellar mass of 1012.98, equivalent to 9.55 trillion M☉, and it is comparable in mass to small, compact galaxy clusters.[4]
The galactic center of 6C 091740+445437 contains an active galactic nucleus (also known as an AGN), specifically classified as a flat-spectrum radio quasar (also referred as a FSRQ). A flat-spectrum radio quasar is a subtype of blazar, and it is generally very luminous.[1][2] The flat-spectrum radio quasar in the center of the galaxy has an estimated luminosity of 56 trillion L☉.[5] The flat-spectrum radio quasar is powered by a ultramassive black hole (commonly called a UMBH) with a mass of 1010.32 or 20.9 billion M☉, making it one of the most massive black holes discovered.[5]
In 2023, in the LOFAR Two-Metre Sky Survey (LoTSS) it was discovered that 6C 091740+445437 was a radio galaxy.[4] The radio structure has an extent of 462,000 light years (141,600 parsecs) across, calculated using an angular diameter of 17.1 arcsecs.[4]
See also
- ESO 146-5, another high-mass galaxy.
- QSO J0529-4351, another extremely luminous quasar.
References
- ^ a b c d "SIMBAD Results for 6C 091740+445437". SIMBAD. Retrieved 2025-12-14.
- ^ a b c d e "NED Results for 6C 091740+445437". NASA/IPAC Extragalactic Database. Retrieved 2025-12-14.
- ^ Hewitt, A. (1993). "A Revised and Updated Catalog of Quasi-stellar Objects". NASA ADS. Retrieved 2025-12-14.
- ^ a b c d Hardcastle, M. J. (2023). "The LOFAR Two-Metre Sky Survey. VI. Optical identifications for the second data release". NASA ADS. Retrieved 2025-12-14.
- ^ a b Shen, Yue (2011). "A Catalog of Quasar Properties from Sloan Digital Sky Survey Data Release 7". NASA ADS. Retrieved 2025-12-14.