OH 471 | |
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![]() The quasar/blazar OH 471. | |
Observation data (J2000.0 epoch) | |
Constellation | Auriga |
Right ascension | 06h 46m 32.0260s |
Declination | +44° 51′ 16.590″ |
Redshift | 3.396000 |
Heliocentric radial velocity | 1,018,295 km/s |
Distance | 11.442 Gly |
Apparent magnitude (V) | 18.49 |
Apparent magnitude (B) | 19.57 |
Characteristics | |
Type | Opt. var; LPQ, FSRQ |
Other designations | |
2E 1729, QSO B0642+449, NVSS J064632+445116, KODIAQ JJ064632+445116, S4 0642+449 |
OH 471 (OHIO H 471) is a distant powerful quasar located in the northern constellation of Auriga. First discovered in 1974 from a photoelectric spectrophotometry, the object has a redshift of (z) 3.40. [1] [2] [3] This high redshift makes it one of the most distant objects observed, giving it a nickname of "the blaze marking the edge of the universe." [4] It is found to be significantly variable thus classifying it as a blazar. [5] [6]
OH 471 is a low polarized quasar but also a high frequency peaker (HFP). [7] It is a radio-loud gamma ray blazar with a central supermassive black hole mass of 9.1 Mʘ and a luminosity of 6.8 x 1028 W Hz-1. [8] [9] In its spectrum, it shows an inverted and steep spectra, reaching a peak at 18.6 GHz. [7]
In additional, OH 471 also displayed two major flares, visible at higher frequencies of 15 and 8 GHz, in March 2003 and October 2008. Reduced activity was observed in the object with its flux density decreasing following 2009. [6] During 1985 to 1996, the object exhibited an increase in its radio flux with its factor showing a slight increase by 1.6. [10]
Observations by Very Long Baseline Interferometry found the object has a core-jet morphology. [11] [12] Based on radio images, the source is compact. Its non-linear structure described as a jet, is found to be extended by 8 milliarcseconds to the east direction. The jet also appears as twisted with a bending angle of 50°. [13] Superluminal motion was also implied as the inner jet component displayed an estimated core separation of 0.76 ± 0.11c. [14] A nuclear region was detected, containing most of the flux density. There is a resolved radio core extending along a position angle of 81°, which is further broken up into two individual circular nuclear components with a separation of 0.76 mas. [15] [16] A fainter component can be seen west from the core. [17]
Digicon and image-tube spectroscopy of the spectrum of OH 471, found there are 89 absorption lines. Four absorption-line redshift systems are identified. Based on results, they are located at redshifts (z) 3.122, 3.191, 3.246 and 3.343. [1]