QSO B1823+568
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| QSO B1823+568 | |
|---|---|
 The BL Lacertae object QSO B1823+568 taken with Pan-STARRS (center). | |
| Observation data (J2000.0 epoch) | |
| Constellation | Draco |
| Right ascension | 18h 24m 07.068s[1] |
| Declination | +56° 51′ 01.49″[1] |
| Redshift | 0.664000[1] |
| Heliocentric radial velocity | 199,062 km/s[1] |
| Distance | 5.917 Gly[1] |
| Apparent magnitude (V) | 19.3 |
| Apparent magnitude (B) | 18.9 |
| Characteristics | |
| Type | FSRQ BLLAC[1] |
| Other designations | |
| 4C +56.27, NVSS J182407+565101, LEDA 2821401, 87GB 182315.0+564925, OU +539, IERS B1823+568, IRCF J182407.0+565101, WMAP 053, 4FGL J1824.1+5651, 1823+568, 2CXO J182407.0+565101, RX J1824.1+5650[1] | |
QSO B1823+568 is a BL Lacertae object[2] located in the northern constellation of Draco. Its redshift is (z) 0.664[3][1] and it was first discovered as an astronomical radio source by A.N. Argue and Chris Sullivan in 1980.[4] The radio spectrum of the source appears as flat making it a flat-spectrum radio quasar[5] but also has been classified as a blazar in literature where it is alternatively designated as 4C 56.27.[6] It is also a radio-loud quasar.[7]
Host galaxy
The host of QSO B1823+568 is found to be an elongated elliptical galaxy based on imaging made by Hubble Space Telescope.[8][9][10] Its V-band apparent magnitude is 16.4.[11] The host displays non-relaxed isotopes suggesting a past merger.[12] It is extremely bright at near-infrared wavelengths.[13] A highly distorted possible companion galaxy was found located east from QSO B1823+568.[8]
Variability
QSO B1823+568 is variable on the electromagnetic spectrum. It is known to display rapid brightening within a few days based on a light curve, which was obtained during the Hamburg quasar monitoring program, conducted at Calar Alto Observatory in August 1991.[14] Its polarization is known to differ between 9 and 17%, with its flux increasing from 1.4 to 2.0 Jansky.[15] Enhanced gamma ray activity was observed from the source on November 16, 2024.[16]
Radio structure
The source of QSO B1823+568 is classified as compact.[17] Observations made by MERLIN described it as having a triple structure, made up of a bright radio core connected by a radio emission bridge. There are two components located 1.1 and 1.4 milliarcseconds away, straddling the core.[18] 84 GHz radio imaging showed a bare core instead with an estimated flux density of 485 mJy.[19] High polarization was also detected in the core based on polarization images made by Very Long Baseline Interferometry.[20]
QSO B1823+568 has an extended jet towards the south-east direction.[20] When revealed through 43 GHz imaging, the jet displays a rich structure on a scale of 14 parsecs and has four identified jet components, detected through a 15 GHz radio image. These components contain jet knots. Two of the knots are moving at superluminal speeds while the other two are stationary. The jet at 43 GHz, instead shows fast-moving knots with implications of a resolved underlying flow.[19] Faraday rotation was detected in the jet with a rotation measure of −200 ± 88 rad m−2.[21] Very Large Array imaging have showed the jet to bend northeast, forming a lobe at the position angle of 95° and appearing to have a longitudinal magnetic field.[22]
Quasi-periodic oscillation
In 2022, QSO B1823+568 was shown to undergo a quasi-periodic oscillation with a variability period of 283+17-13 days, equivalent to more than 10 days but less than a year. Based on observations, this is likely explained by a nonballistic helical jet motion driven by orbital motion in a binary supermassive black hole system lying in the center of the quasar. The mass of the primary supermassive black hole is estimated to be between 1.92 billion M☉ and 3.43 billion M☉.[23]
References
- 1 2 3 4 5 6 7 8 "NED Search results for QSO B1823+568 (1823+568)". NASA/IPAC Extragalactic Database. Retrieved 2025-05-11.
- ↑ Gabuzda, Denise C.; Cawthorne, Timothy V.; Roberts, David H.; Wardle, John F. C. (December 1989). "The Milliarcsecond Polarization Structure of Six BL Lacertae Objects". The Astrophysical Journal. 347: 701. Bibcode:1989ApJ...347..701G. doi:10.1086/168162. ISSN 0004-637X.
- ↑ Schartel, N.; Walter, R.; Fink, H. H.; Truemper, J. (March 1996). "Redshift dependence of soft X-ray quasar spectra". Astronomy and Astrophysics. 307: 33. Bibcode:1996A&A...307...33S. ISSN 0004-6361.
- ↑ Argue, A. N.; Sullivan, C. (September 1980). "Optical identifications of reference frame benchmark radio sources". Monthly Notices of the Royal Astronomical Society. 192: 779–786. doi:10.1093/mnras/192.4.779 (inactive 1 July 2025). ISSN 0035-8711.
{{cite journal}}: CS1 maint: DOI inactive as of July 2025 (link) - ↑ Stickel, M.; Fried, J. W.; Kuehr, H. (October 1989). "Optical spectroscopy of 1 Jy BL Lacertae objects and flat spectrum radio sources". Astronomy and Astrophysics Supplement Series. 80: 103–114. ISSN 0365-0138.
- ↑ Argote, M.; Benítez, E.; Dultzin-Hacyan, D. (October 1998). "Research Note: CCD Photometry of Blazars 3C 345, 3C 446, and 4C 56.27". Revista Mexicana de Astronomía y Astrofísica. 34: 83–86. Bibcode:1998RMxAA..34...83A. ISSN 0185-1101.
- ↑ Örndahl, E.; Rönnback, J.; Groningen, E. van (2003-06-01). "An optical imaging study of 0.4 z ≤ 0.8 quasar host galaxies - I. Observations and reduction" (PDF). Astronomy & Astrophysics. 404 (3): 883–899. doi:10.1051/0004-6361:20030508. ISSN 0004-6361.
- 1 2 Falomo, Renato; Urry, C. Megan; Pesce, Joseph E.; Scarpa, Riccardo; Giavalisco, Mauro; Treves, Aldo (1997-02-10). "HST Observations of Host Galaxies in Three Radio-selected BL Lacertae Objects". The Astrophysical Journal. 476 (1): 113–119. Bibcode:1997ApJ...476..113F. doi:10.1086/303620. ISSN 0004-637X.
- ↑ Roland, J.; Britzen, S.; Caproni, A.; Fromm, C.; Glück, C.; Zensus, A. (2013-09-01). "Binary black holes in nuclei of extragalactic radio sources" (PDF). Astronomy & Astrophysics. 557: A85. arXiv:1307.3700. Bibcode:2013A&A...557A..85R. doi:10.1051/0004-6361/201219165. ISSN 0004-6361.
- ↑ Falomo, R.; Urry, C. M.; Pesce, J.; Scarpa, R.; Treves, A.; Giavalisco, M. (1997). "HST Imaging of BL Lac Objects". In Clements, David L.; Pérez-Fournon, Ismael (eds.). Quasar Hosts. ESO Astrophysics Symposia. Berlin, Heidelberg: Springer. pp. 194–199. doi:10.1007/978-3-540-69648-3_35. ISBN 978-3-540-69648-3.
- ↑ Kotilainen, J. K.; Hyvönen, T.; Falomo, R. (2005-09-01). "The luminous host galaxies of high redshift BL Lac objects" (PDF). Astronomy & Astrophysics. 440 (3): 831–843. arXiv:astro-ph/0505443. Bibcode:2005A&A...440..831K. doi:10.1051/0004-6361:20042548. ISSN 0004-6361.
- ↑ 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" (PDF). Astronomy & Astrophysics. 519: A62. arXiv:1005.2177. Bibcode:2010A&A...519A..62K. doi:10.1051/0004-6361/200913550. ISSN 0004-6361.
- ↑ Heidt, Jochen (1997). "Near-IR Imaging of BL Lac Host Galaxies". In Clements, David L.; Pérez-Fournon, Ismael (eds.). Quasar Hosts. ESO Astrophysics Symposia. Berlin, Heidelberg: Springer. pp. 200–205. doi:10.1007/978-3-540-69648-3_36. ISBN 978-3-540-69648-3.
- ↑ Borgeest, K.-J. Schramm U.; Kühl, D.; von Linde, J.; Linnert, M. D.; Schramm, T. (March 1994). "The Hamburg Quasar Monitoring Program (HQM) at Calar Alto III. Lightcurves of optically violent variable sources". Astronomy and Astrophysics Supplement Series. 106: 349. arXiv:astro-ph/9403050. Bibcode:1994A&AS..106..349S.
- ↑ Stevens, J. A.; Robson, E. I.; Holland, W. S. (1996-05-01). "Millimeter and Submillimeter Polarization Observations of Blazars". The Astrophysical Journal. 462 (1): L23–L26. doi:10.1088/1538-4357/462/1/l23. ISSN 0004-637X.
- ↑ Paiano, Simona; Falomo, Renato; Treves, Aldo; Scarpa, Riccardo (November 2024). "Optical spectrum of the BL Lac object 4FGL J1824.1+5651 (4C +56.27)". The Astronomer's Telegram. 16925: 1. Bibcode:2024ATel16925....1P.
- ↑ Rudnick, L.; Jones, T. W. (April 1982). "Compact radio sources : the dependence of variability and polarization on spectral shape". The Astrophysical Journal. 255: 39–47. Bibcode:1982ApJ...255...39R. doi:10.1086/159800. ISSN 0004-637X.
- ↑ 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 Cheng, X.-P.; An, T.; Hong, X.-Y.; Yang, J.; Mohan, P.; Kellermann, K. I.; Lister, M. L.; Frey, S.; Zhao, W.; Zhang, Z.-L.; Wu, X.-C.; Li, X.-F.; Zhang, Y.-K. (2018-01-01). "The Most Compact Bright Radio-loud AGNs. II. VLBA Observations of 10 Sources at 43 and 86 GHz". The Astrophysical Journal Supplement Series. 234 (1): 17. arXiv:1712.06314. Bibcode:2018ApJS..234...17C. doi:10.3847/1538-4365/aa9e4b. ISSN 0067-0049.
- 1 2 Gabuzda, D. C.; Cawthorne, T. V. (December 2000). "VLBI polarization images of eight compact active galactic nuclei at λ=1.3cm". Monthly Notices of the Royal Astronomical Society. 319 (4): 1056–1066. Bibcode:2000MNRAS.319.1056G. doi:10.1046/j.1365-8711.2000.03881.x. ISSN 0035-8711.
- ↑ Zavala, R. T.; Taylor, G. B. (2003-05-20). "A View through Faraday's Fog: Parsec-Scale Rotation Measures in Active Galactic Nuclei". The Astrophysical Journal. 589 (1): 126–146. arXiv:astro-ph/0302367. Bibcode:2003ApJ...589..126Z. doi:10.1086/374619. ISSN 0004-637X.
- ↑ Cawthorne, T. V.; Wardle, J. F. C.; Roberts, D. H.; Gabuzda, D. C.; Brown, L. F. (October 1993). "Milliarcsecond Polarization Structure of 24 Objects from the Pearson-Readhead Sample of Bright Extragalactic Radio Sources. I. The Images". The Astrophysical Journal. 416: 496. Bibcode:1993ApJ...416..496C. doi:10.1086/173253. ISSN 0004-637X.
- ↑ Li, Huai-Zhen; Gao, Quan-Gui; Qin, Long-Hua; Yi, Ting-Feng; Chen, Qi-Rui (2022-04-29). "Quasi-periodic Oscillation Analysis for the BL Lacertae Object 1823+568". Research in Astronomy and Astrophysics. 22 (5): 055017. Bibcode:2022RAA....22e5017L. doi:10.1088/1674-4527/ac630e. ISSN 1674-4527.
External links
- QSO B1823+568 on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
- QSO B1823+568 on SIMBAD
