OJ 508
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| OJ 508 | |
|---|---|
 SDSS image of OJ 508 | |
| Observation data (J2000.0 epoch) | |
| Constellation | Lynx |
| Right ascension | 08h 08m 39.66s [1] |
| Declination | +49° 50′ 36.53″ [1] |
| Redshift | 1.434400 [1] |
| Heliocentric radial velocity | 430,022 km/s[1] |
| Distance | 9.355 Gly |
| Apparent magnitude (V) | 19.18 |
| Apparent magnitude (B) | 19.55 |
| Characteristics | |
| Type | blazar; HPQ FSRQ [1] |
| Size | ~170,000 ly (52 kpc) (estimated)[1] |
| Other designations | |
| SDSS J080839.56+495036.5, LEDA 2355150, BP 71, INTREF 344, QSO B0804+599, GB1 0805+500, FIRST J080839.6+495036 | |
OJ 508 also known as SBS 0804+499, is a quasar located in the constellation of Lynx. The redshift of the quasar is estimated to be (z) 1.434[1] and it was first discovered as an astronomical radio source in 1981 by astronomers.[2] The radio spectrum of the quasar is estimated to be flat, making it a flat-spectrum radio quasar.[3]
The radio source of OJ 508 is compact. When observed with Very Long Baseline Interferometry (VLBI), the source has an asymmetrical complicated radio structure made up of an unresolved component and weak extended structure that is located in the southeast region.[4] Further observations found there are multiple components displaying superluminal motion. In addition, the quasar has a broad radio jet travelling southeast from east direction, reaching about one to three milliarcseconds. Imaging made at 22 Hz, showed this jet has a twisted appearance.[5] The radio core of the quasar is only 0.15 milliarcseconds in extent, with the presence of extended radio emission east.[6]
OJ 508 is described as a highly polarized quasar (HPQ).[7] The quasar has polarization levels ranging between 8.6% up to 11.3%.[8] It is variable on a short measured timescale which lasted around 22 days.[5] An outburst was detected from the quasar, beginning in 1997 and ending at the end of the monitoring period. The modulation index of the quasar was observed rising 18% at various wavelengths before declining 14% when observed at 1.3 centimeter wavelengths.[9] High amplitude variability was observed, increasing to 35% in April 1990.[10]
The host galaxy of OJ 508 has been classified as unresolved, but has a faint tidal tail extension that is expanding by 3.5 arcseconds north from the quasar, and also in off-center direction. This is possibly a recent sign of a tidal interaction.[11] Later, when observed in 2010, it was found the disturbed morphology of the quasar isn't related to any interactions.[12] A faint galaxy is 10 arcseconds away from the quasar.[11]
References
- 1 2 3 4 5 6 7 "NED Search results for OJ 508". NASA/IPAC Extragalactic Database. Retrieved 2025-10-05.
- ↑ Peacock, J. A.; Wall, J. V. (January 1981). "Bright extragalactic radio sources at 2.7 GHz - I. The northern hemisphere catalogue". Monthly Notices of the Royal Astronomical Society. 194 (2): 331–349. Bibcode:1981MNRAS.194..331P. doi:10.1093/mnras/194.2.331. ISSN 0035-8711.
- ↑ Zensus, J. A.; Porcas, R. W.; Pauliny-Toth, I. I. K. (April 1984). "VLBI study of 57 flat spectrum radio sources at 5 GHz". Astronomy and Astrophysics. 133: 27–30. Bibcode:1984A&A...133...27Z. ISSN 0004-6361.
- ↑ Pearson, T. J.; Readhead, A. C. S. (May 1988). "The Milliarcsecond Structure of a Complete Sample of Radio Sources. II. First-Epoch Maps at 5 GHz". The Astrophysical Journal. 328: 114. Bibcode:1988ApJ...328..114P. doi:10.1086/166274. ISSN 0004-637X.
- 1 2 Jorstad, Svetlana G.; Marscher, Alan P.; Mattox, John R.; Wehrle, Ann E.; Bloom, Steven D.; Yurchenko, Alexei V. (June 2001). "Multiepoch Very Long Baseline Array Observations of EGRET-detected Quasars and BL Lacertae Objects: Superluminal Motion of Gamma-Ray Bright Blazars". The Astrophysical Journal Supplement Series. 134 (2): 181–240. arXiv:astro-ph/0101570. Bibcode:2001ApJS..134..181J. doi:10.1086/320858. ISSN 0067-0049.
- ↑ Dodson, R.; Fomalont, E. B.; Wiik, K.; Horiuchi, S.; Hirabayashi, H.; Edwards, P. G.; Murata, Y.; Asaki, Y.; Moellenbrock, G. A.; Scott, W. K.; Taylor, A. R.; Gurvits, L. I.; Paragi, Z.; Frey, S.; Shen, Z.-Q. (April 2008). "The VSOP 5 GHz Active Galactic Nucleus Survey. V. Imaging Results for the Remaining 140 Sources". The Astrophysical Journal Supplement Series. 175 (2): 314–355. arXiv:0710.5707. Bibcode:2008ApJS..175..314D. doi:10.1086/525025. ISSN 0067-0049.
- ↑ Nolan, P. L.; Bertsch, D. L.; Chiang, J.; Dingus, B. L.; Esposito, J. A.; Fichtel, C. E.; Fierro, J. M.; Hartman, R. C.; Hunter, S. D.; Kanbach, G.; Kniffen, D. A.; Lin, Y. C.; Mattox, J. R.; Mayer-Hasselwander, H. A.; Michelson, P. F. (March 1996). "EGRET Observations of Gamma Rays from Point Sources with Galactic Latitude +10 degrees < B < +40 degrees". The Astrophysical Journal. 459: 100. arXiv:astro-ph/9509023. Bibcode:1996ApJ...459..100N. doi:10.1086/176872. ISSN 0004-637X.
- ↑ Thompson, D. J.; Bertsch, D. L.; Dingus, B. L.; Fichtel, C. E.; Hartman, R. C.; Hunter, S. D.; Kanbach, G.; Kniffen, D. A.; Lin, Y. C.; Mattox, J. R.; Mayer-Hasselwander, H. A.; Michelson, P. F.; von Montigny, C.; Nolan, P. L.; Schneid, E. J. (September 1993). "EGRET Observations of Active Galactic Nuclei: 0836+710, 0454-234, 0804+499, 0906+430, 1510-089, and 2356+196". The Astrophysical Journal. 415: L13. Bibcode:1993ApJ...415L..13T. doi:10.1086/187021. ISSN 0004-637X.
- ↑ Peng, B.; Kraus, A.; Krichbaum, T. P.; Witzel, A. (July 2000). "Long-term monitoring of selected radio sources" (PDF). Astronomy and Astrophysics Supplement Series. 145: 1–10. Bibcode:2000A&AS..145....1P. doi:10.1051/aas:2000230. ISSN 0365-0138.
- ↑ Kraus, A.; Krichbaum, T. P.; Wegner, R.; Witzel, A.; Cimò, G.; Quirrenbach, A.; Britzen, S.; Fuhrmann, L.; Lobanov, A. P.; Naundorf, C. E.; Otterbein, K.; Peng, B.; Risse, M.; Ros, E.; Zensus, J. A. (April 2003). "Intraday variability in compact extragalactic radio sources. II. Observations with the Effelsberg 100 m radio telescope" (PDF). Astronomy and Astrophysics. 401: 161–172. Bibcode:2003A&A...401..161K. doi:10.1051/0004-6361:20030118. ISSN 0004-6361.
- 1 2 Hutchings, J. B.; Crampton, David; Morris, S. L.; Durand, D.; Steinbring, E. (March 1999). "QSO Hosts and Environments at Z=0.9-4.2: JHK Images with Adaptive Optics". The Astronomical Journal. 117 (3): 1109–1121. arXiv:astro-ph/9812159. Bibcode:1999AJ....117.1109H. doi:10.1086/300787. ISSN 0004-6256.
- ↑ Karouzos, M.; Britzen, S.; Eckart, A.; Witzel, A.; Zensus, A. (2010-09-01). "Tracing the merger-driven evolution of active galaxies using the CJF sample". Astronomy & Astrophysics. 519: A62. arXiv:1005.2177. Bibcode:2010A&A...519A..62K. doi:10.1051/0004-6361/200913550. ISSN 0004-6361.
