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PKS 1610-771

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PKS 1610-771
The quasar PKS 1610-771.
Observation data (J2000.0 epoch)
ConstellationApus
Right ascension16h 17m 49.27s
Declination−77° 17′ 18.46″
Redshift1.710000
Heliocentric radial velocity512,645 km/s
Distance9.866 Gly
Apparent magnitude (V)19.0
Apparent magnitude (B)19.19
Characteristics
TypeOpt. Var; FSRQ, blazar
Other designations
PKS 1610-77, LQAC 244-077 001, IRCF J161749.2-771718, LEDA 2828743, WMAP 183, 4FGL J1617.9-7718, 1610-771

PKS 1610-771 is a quasar located in the southern constellation of Apus. Its redshift is (z) 1.710[1][2] and it was first discovered by the Molongo Radio Telescope in 1972.[3] This object is known to be radio-loud[4] and has a radio spectrum, appearing as flat, making it a flat-spectrum radio source.[5][6]

Description

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PKS 1610-771 is found to be a highly reddened quasar with an estimated R-K band color index of 3.1.[7][8] Its spectrum is found to have an unusual convex shape. Although it is not gravitationally lensed, the object has fuzzy elongations in the north and south directions. Evidence points out these elongations are orientated perpendicular to the object's polarization angle indicating they might be related to the quasar.[7]

The radio structure of PKS 1610-771 is found compact. It has an elongated radio core along the position angle of 35° with a flux density of 5.4 Jy. There is also a circular halo, measuring a size of 50 milliarcseconds.[9] When shown on radio imaging during the Very Long Baseline Interferometry Observatory Programme at 8.4 GHz, the source is found resolved into two compact components with their separations showing proper motions of 0.19 ± 0.07 milliarcseconds per year.[10] In the north to west direction, there is a jet extending 5 milliarcseconds from the core, containing bright jet knots. Diffused radio emission can also be seen north of the source.[11]

PKS 1610-771 is shown to display signs of interstellar scintillation at low radio frequencies on a timescale of 400 days.[12][13] A rapid change of flux density was also noted in the quasar, during the four day observation with its peak-to-peak amplitude of 40% and intensity parameter of 0.44 Jy.[14]

PKS 1610-771 has high degree of optical linear polarization.[4] When observed by Australia Telescope Compact Array (ATCA), it is found to have several polarized components inside the inner jet regions with the strongest component having a rotation measure of +107.1 ± 0.2 rad m-2.[12] Its polarized flux density is described having monthly changes.[15]

H I absorption has also been detected towards the quasar's spectrum at a redshift of (z) 0.45.[16]

References

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  1. ^ Hunstead, R. W.; Murdoch, H. S. (1980). "A QSO with a steep optical spectrum". Monthly Notices of the Royal Astronomical Society. 192: 31. Bibcode:1980MNRAS.192P..31H. doi:10.1093/mnras/192.1.31P. ISSN 0035-8711.
  2. ^ "NED search results for PKS 1610-771 (PKS 1610-77)". NASA/IPAC Extragalactic Database. Retrieved 2025-05-17.
  3. ^ Hunstead, R. W. (1972). "Accurate positions of radio sources at 408 MHz". Monthly Notices of the Royal Astronomical Society. 157 (4): 367–402. Bibcode:1972MNRAS.157..367H. doi:10.1093/mnras/157.4.367. ISSN 0035-8711.
  4. ^ a b Courbin, F.; Hutsemekers, D.; Meylan, G.; Magain, P.; Djorgovski, S. G. (February 1997). "Sub-arcsecond imaging and spectroscopy of the radio-loud highly polarized quasar PKS 1610-771". Astronomy and Astrophysics. 317: 656–660. arXiv:astro-ph/9606114. Bibcode:1997A&A...317..656C. ISSN 0004-6361.
  5. ^ Burgess, A. M.; Hunstead, R. W. (January 2006). "The Molonglo Southern 4 Jy Sample (MS4). II. ATCA Imaging and Optical Identification". The Astronomical Journal. 131 (1): 114–132. arXiv:astro-ph/0512590. Bibcode:2006AJ....131..114B. doi:10.1086/498679. ISSN 0004-6256.
  6. ^ Beasley, A. J.; Conway, J. E.; Booth, R. S.; Nyman, L.-Å; Holdaway, M. (1997-09-01). "SEST observations of southern flat–spectrum radio sources" (PDF). Astronomy and Astrophysics Supplement Series. 124 (3): 469–474. Bibcode:1997A&AS..124..469B. doi:10.1051/aas:1997203. ISSN 0365-0138.
  7. ^ a b Courbin, F.; Hutsemékers, D.; Meylan, G.; Magain, P.; Djorgovski, S. G. (September 1996). "PKS 1610-771: a highly reddened quasar?". The Messenger. 85: 27–28. ISSN 0722-6691.
  8. ^ Courbin, F.; Claeskens, J.-F. (June 1997). "High-resolution imaging with bad seeing: PKS 1610-771 as a test case". The Messenger. 88: 32–33. Bibcode:1997Msngr..88...32C. ISSN 0722-6691.
  9. ^ Preston, R. A.; Jauncey, D. L.; Meier, D. L.; Tzioumis, A. K.; Ables, J.; Batchelor, R.; Faulkner, J.; Gates, J.; Greene, B.; Hamilton, P. A.; Harvey, B. R.; Haynes, R. F.; Johnson, B.; Lambeck, K.; Louie, A. P. (July 1989). "The Southern Hemisphere VLBI Experiment". The Astronomical Journal. 98: 1. Bibcode:1989AJ.....98....1P. doi:10.1086/115122. ISSN 0004-6256.
  10. ^ Tingay, S. J.; Reynolds, J. E.; Tzioumis, A. K.; Jauncey, David L.; Lovell, J. E. J.; Dodson, R.; Costa, M. E.; McCulloch, P. M.; Edwards, P. G.; Hirabayashi, H.; Murphy, D. W.; Preston, R. A.; Piner, B. G.; Nicolson, G. D.; Quick, J. F. H. (2002-08-01). "VSOP Space VLBI and Geodetic VLBI Investigations of SouthernHemisphere Radio Sources". The Astrophysical Journal Supplement Series. 141 (2): 311. Bibcode:2002ApJS..141..311T. doi:10.1086/340783. ISSN 0067-0049.
  11. ^ Ojha, R.; Kadler, M.; Böck, M.; Booth, R.; Dutka, M. S.; Edwards, P. G.; Fey, A. L.; Fuhrmann, L.; Gaume, R. A.; Hase, H.; Horiuchi, S.; Jauncey, D. L.; Johnston, K. J.; Katz, U.; Lister, M. (2010-09-01). "TANAMI: tracking active galactic nuclei with austral milliarcsecond interferometry - I. First-epoch 8.4 GHz images" (PDF). Astronomy & Astrophysics. 519: A45. arXiv:1005.4432. Bibcode:2010A&A...519A..45O. doi:10.1051/0004-6361/200912724. ISSN 0004-6361.
  12. ^ a b O’Sullivan, S. P.; Brown, S.; Robishaw, T.; Schnitzeler, D. H. F. M.; McClure-Griffiths, N. M.; Feain, I. J.; Taylor, A. R.; Gaensler, B. M.; Landecker, T. L.; Harvey-Smith, L.; Carretti, E. (2012-04-21). "Complex Faraday depth structure of active galactic nuclei as revealed by broad-band radio polarimetry". Monthly Notices of the Royal Astronomical Society. 421 (4): 3300–3315. arXiv:1201.3161. Bibcode:2012MNRAS.421.3300O. doi:10.1111/j.1365-2966.2012.20554.x. ISSN 0035-8711.
  13. ^ Gaensler, B. M.; Hunstead, R. W. (April 2000). "Long-term Monitoring of Molonglo Calibrators". Publications of the Astronomical Society of Australia. 17 (1): 72–82. arXiv:astro-ph/9911194. Bibcode:2000PASA...17...72G. doi:10.1071/AS00072. ISSN 1323-3580.
  14. ^ Romero, G. E.; Benaglia, P.; Combi, J. A. (August 1997). "Variability observations of selected southern extragalactic radio sources" (PDF). Astronomy and Astrophysics Supplement Series. 124 (2): 307–313. Bibcode:1997A&AS..124..307R. doi:10.1051/aas:1997195. ISSN 0365-0138.
  15. ^ Kedziora-Chudczer, L. L.; Jauncey, D. L.; Wieringa, M. H.; Tzioumis, A. K.; Reynolds, J. E. (August 2001). "The ATCA intraday variability survey of extragalactic radio sources". Monthly Notices of the Royal Astronomical Society. 325 (4): 1411–1430. arXiv:astro-ph/0103506. Bibcode:2001MNRAS.325.1411K. doi:10.1046/j.1365-8711.2001.04516.x. ISSN 0035-8711.
  16. ^ Weng, Simon; Sadler, Elaine M; Foster, Caroline; Péroux, Céline; Mahony, Elizabeth K; Allison, James R; Moss, Vanessa A; Su, Renzhi; Whiting, Matthew T; Yoon, Hyein (2022-03-21). "Observations of cold extragalactic gas clouds at z = 0.45 towards PKS 1610-771". Monthly Notices of the Royal Astronomical Society. 512 (3): 3638–3650. doi:10.1093/mnras/stac747. ISSN 0035-8711.
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