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QSO B1954+513

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QSO B1954+513
The quasar QSO B1954+513.
Observation data (J2000 epoch)
ConstellationCygnus
Right ascension19h 55m 42.73s[1]
Declination+51° 31′ 48.54″[1]
Redshift1.220000[1]
Heliocentric radial velocity365,747 km/s[1]
Distance8.533 Gly
Apparent magnitude (V)18.5
Characteristics
TypeLPQ FSRQ[1]
Other designations
OV +591, TXS 1954+513, WMAP 051, RX J1955.6+5131, IRCF J195542.7+513148, 2MASS J19554274+5131487, CRATES J195542.73+513148.5, 1954+513[1]

QSO B1954+513 is a quasar located in the constellation of Cygnus. It has a redshift of (z) 1.22[1] and it was first discovered by astronomers J.D. Kraus and M.R. Gearhart from the Ohio State University Radio Observatory in 1975.[2] The radio spectrum of the source appears to be flat, making the quasar a flat-spectrum radio source, but also has low polarization.[3][4][5]

Description

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QSO B1954+513 is classified as a radio-loud quasar.[6] It has an X-ray luminosity of 1043 erg s−1 and its optical spectrum has broad emission lines. The R and B magnitudes of the quasar are estimated to be 17.34 and 18.87 respectively. It is also a blazar mainly due to its X-ray, optical and radio characteristics.[7] A gamma ray flare was detected in October 2020 by Large Area Telescope.[8]

The source of QSO B1954+513 is found compact. It has a classical triple Fanaroff-Riley Class II radio structure made up of a radio core and two radio lobes which is orientated in a north to south direction. The source's extent is estimated to be 130 kiloparsecs.[6][9] Radio imaging by Very Large Array at 5 GHz, showed it has a slightly elongated southern component towards the core. There is a faint extended component resolved by both VLBI Space Observatory Programme and Very Long Baseline Array 5 GHz image. This component is separated from the core by around 0.4 milliarcseconds with a position angle of -27°.[10]

The jet of QSO B1954+513 is extended towards northwest direction. Based on observations, it measures at least 10 milliarcseconds in length at an 70° position angle.[11] When shown on an image taken with Very Large Array (VLA), the jet is found connecting with the core towards north. At the end of the jet, there is an elongated knot made of two components.[12] An image taken at 43 GHz showed the quasar has an inner jet which is resolved into 5 jet components. These components are found following a straight line which reaches at 1.3 milliarcseconds. There, the jet then subsequently bends into a jet component located at a -68° position angle. Polarized emission in the bending angle is present, suggesting the jet had interacted with an interstellar cloud which in turn changed the jet's direction.[6]

QSO B1954+513 shows signs of rotation measure. Based on high frequency rotation-mapping by Very Long Baseline Array in March 2013, its rotation measure is found either inverted or faded out upon moving from the core region.[13] H I absorption was also detected from the quasar at high ultraviolet luminosities indicating the survival of neutral hydrogen in active galactic nuclei.[7]

References

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  1. ^ a b c d e f g "Results for QSO B1954+513 (1954+513)". NASA/IPAC Extragalactic Database. Retrieved 2025-05-10.
  2. ^ Kraus, J. D.; Gearhart, M. R. (January 1975). "Radio spectra and redshifts of 179 QSOs". The Astronomical Journal. 80: 1–8. Bibcode:1975AJ.....80....1K. doi:10.1086/111705. ISSN 0004-6256.
  3. ^ Moore, P. K.; Browne, I. W. A.; Daintree, E. J.; Noble, R. G.; Walsh, D. (1981-11-01). "A statistical study of flat-spectrum radio sources at 966 MHz". Monthly Notices of the Royal Astronomical Society. 197 (2): 325–337. Bibcode:1981MNRAS.197..325M. doi:10.1093/mnras/197.2.325. ISSN 0035-8711.
  4. ^ Bloom, Steven D.; Marscher, Alan P.; Moore, E. M.; Gear, Walter; Teräsranta, Harri; Valtaoja, Esko; Aller, Hugh D.; Aller, Margo F. (May 1999). "Multiwaveband Observations of Quasars with Flat Radio Spectra and Strong Millimeter-Wave Emission". The Astrophysical Journal Supplement Series. 122 (1): 1–27. arXiv:astro-ph/9812089. Bibcode:1999ApJS..122....1B. doi:10.1086/313204. ISSN 0067-0049.
  5. ^ Teraesranta, H.; Tornikoski, M.; Mujunen, A.; Karlamaa, K.; Valtonen, T.; Henelius, N.; Urpo, S.; Lainela, M.; Pursimo, T.; Nilsson, K.; Wiren, S.; Laehteenmaeki, A.; Korpi, M.; Rekola, R.; Heinaemaeki, P. (November 1998). "Fifteen years monitoring of extragalactic radio sources at 22, 37 and 87 GHz" (PDF). Astronomy and Astrophysics Supplement Series. 132 (3): 305–331. Bibcode:1998A&AS..132..305T. doi:10.1051/aas:1998297. ISSN 0365-0138.
  6. ^ a b c 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. (January 2018). "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.
  7. ^ a b Aditya, J. N. H. S.; Kanekar, Nissim; Prochaska, J. Xavier; Day, Brandon; Lynam, Paul; Cruz, Jocelyn (2016-12-05). "Giant Metrewave Radio Telescope detection of associated H i 21-cm absorption at z = 1.2230 towards TXS 1954+513". Monthly Notices of the Royal Astronomical Society. 465 (4): 5011–5015. arXiv:1612.01139. doi:10.1093/mnras/stw3105. ISSN 0035-8711.
  8. ^ Mereu, I.; Cheung, C. C. (October 2020). "Fermi-LAT detection of a hard-spectrum GeV flare from the FSRQ OV 591". The Astronomer's Telegram. 14066: 1. Bibcode:2020ATel14066....1M.
  9. ^ Perley, R. A. (June 1982). "The positions, structures and polarizations of 404 compact radio sources". The Astronomical Journal. 87: 859–880. Bibcode:1982AJ.....87..859P. doi:10.1086/113167. ISSN 0004-6256.
  10. ^ 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.
  11. ^ Zensus, J. A.; Ros, E.; Kellermann, K. I.; Cohen, M. H.; Vermeulen, R. C.; Kadler, M. (August 2002). "Sub-milliarcsecond Imaging of Quasars and Active Galactic Nuclei. II. Additional Sources". The Astronomical Journal. 124 (2): 662–674. arXiv:astro-ph/0205076. Bibcode:2002AJ....124..662Z. doi:10.1086/341585. ISSN 0004-6256.
  12. ^ Kollgaard, R. I.; Wardle, J. F. C.; Roberts, D. H. (October 1990). "High Dynamic Range VLA Observations of Eight Core-Dominated Quasars". The Astronomical Journal. 100: 1057. Bibcode:1990AJ....100.1057K. doi:10.1086/115579. ISSN 0004-6256.
  13. ^ Algaba, J. C. (2013-01-17). "High-frequency very long baseline interferometry rotation measure of eight active galactic nuclei". Monthly Notices of the Royal Astronomical Society. 429 (4): 3551–3563. arXiv:1212.3423. doi:10.1093/mnras/sts624. ISSN 1365-2966.
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