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PKS 1519-273

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PKS 1519-273
The BL Lacertae object PKS 1519-273.
Observation data (J2000.0 epoch)
ConstellationLibra
Right ascension15h 22m 37.676s
Declination−27° 30′ 10.786″
Redshift1.297000
Heliocentric radial velocity388,831 km/s
Distance8.529 Gly
Apparent magnitude (V)18.5
Apparent magnitude (B)18.72
Characteristics
TypeBLLAC
Other designations
NVSS J152237-273010, 4FGL J1522.6-2730, IRCF J152237.6-273010, PKS J1522-2730

PKS 1519-273 is a BL Lacertae object located in the constellation of Libra. Its redshift is (z) 1.297[1] and was first discovered by the Very Large Array (VLA) as a strong extragalactic radio source in 1981[2] The radio spectrum of PKS 1519-273 is flat, leading to its classification as a flat-spectrum radio source.[3][4]

Description

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PKS 1519-273 is an intraday variable source. It displays significant variations in both linear and circular polarization at centimeter wavelengths.[5][6] When observed in August 2000, its circular polarization was found to differ between frequencies of 1.4 and 8.6 GHz on an hour-to-day timescale. According to scientists who studied it, the variability likely originated from interstellar scintillation of a compact source component containing about 3.8% of the circular polarization.[7] Irregular variability was detected in PKS 1519-273 on hourly timescales, with the object showing flux changes at higher amplitudes of 8.6 and 4.8 GHz. These flux changes were subsequently accompanied by anticorrelated polarization variability.[8]

The source of PKS 1519-273 is found to be compact. It has a slightly extended structure located in the west direction with an unresolved radio core based on Very Long Baseline Interferometry observations.[9][10] It is estimated to have a flux density of 2.2 Jansky, a brightness temperature that is greater than 3.2 trillion Kelvin and an estimated size of 0.25 milliarcseconds.[10][11]

PKS 1519-273 is classified as a blazar according to an optical polarimetry study conducted in 1988, with an inverted spectrum during flaring periods.[12][13] Radio variability was also detected by the Australia Telescope Compact Array, with its mean flux density shifting between 1.8 and 2.2 Jansky.[14] In October 2023, it showed gamma ray activity, which was detected by the Large Area Telescope.[15]

References

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  1. ^ Sbarufatti, B.; Treves, A.; Falomo, R.; Heidt, J.; Kotilainen, J.; Scarpa, R. (February 2005). "ESO Very Large Telescope Optical Spectroscopy of BL Lacertae Objects. I. New Redshifts". The Astronomical Journal. 129 (2): 559–566. arXiv:astro-ph/0410692. Bibcode:2005AJ....129..559S. doi:10.1086/427138. ISSN 0004-6256.
  2. ^ Ulvestad, J.; Johnston, K.; Perley, R.; Fomalont, E. (July 1981). "A VLA survey of strong radio sources". The Astronomical Journal. 86: 1010–1035. Bibcode:1981AJ.....86.1010U. doi:10.1086/112977. ISSN 0004-6256.
  3. ^ Siebert, J.; Brinkmann, W.; Drinkwater, M. J.; Yuan, W.; Francis, P. J.; Peterson, B. A.; Webster, R. L. (November 1998). "X-ray properties of the Parkes sample of flat-spectrum radio sources: dust in radio-loud quasars?". Monthly Notices of the Royal Astronomical Society. 301 (1): 261–279. arXiv:astro-ph/9808065. Bibcode:1998MNRAS.301..261S. doi:10.1046/j.1365-8711.1998.02019.x. ISSN 0035-8711.
  4. ^ Veron-Cetty, M.-P.; Veron, P. (September 1993). "Spectroscopic observations of sixteen BL Lacertae candidates". Astronomy and Astrophysics Supplement Series. 100: 521–529. Bibcode:1993A&AS..100..521V. ISSN 0365-0138.
  5. ^ Bennett, W.; Macquart, J. P.; Johnston, H.; Jauncey, D. (December 2005). "Circular Polarization in PKS 1519-273". American Astronomical Society Meeting Abstracts. 207: 127.02. Bibcode:2005AAS...20712702B.
  6. ^ Ruszkowski, Mateusz; Begelman, Mitchell C. (2002-07-10). "Circular Polarization from Stochastic Synchrotron Sources". The Astrophysical Journal. 573 (2): 485–495. arXiv:astro-ph/0112090. Bibcode:2002ApJ...573..485R. doi:10.1086/340659. ISSN 0004-637X.
  7. ^ Macquart, J.-P.; Kedziora-Chudczer, Lucyna; Rayner, David P.; Jauncey, David L. (August 2000). "Strong, Variable Circular Polarization in PKS 1519−273". The Astrophysical Journal. 538 (2): 623–627. Bibcode:2000ApJ...538..623M. doi:10.1086/309184. ISSN 0004-637X.
  8. ^ Kedziora-Chudczer, L. L.; Jauncey, D. L.; Wieringa, M. H.; Reynolds, J. E.; Tzioumis, A. K. (1998). "Four Southern Intraday Variable Radio Sources". International Astronomical Union Colloquium. 164: 271–272. Bibcode:1998ASPC..144..271K. doi:10.1017/s0252921100045516. ISSN 0252-9211.
  9. ^ 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.
  10. ^ a b Shen, Z.-Q.; Wan, T.-S.; Moran, J. M.; Jauncey, D. L.; Reynolds, J. E.; Tzioumis, A. K.; Gough, R. G.; Ferris, R. H.; Sinclair, M. W.; Jiang, D.-R.; Hong, X.-Y.; Liang, S.-G.; Costa, M. E.; Tingay, S. J.; McCulloch, P. M. (November 1997). "A 5-GHz Southern Hemisphere VLBI Survey of Compact Radio Sources.I.". The Astronomical Journal. 114: 1999. arXiv:astro-ph/9709128. Bibcode:1997AJ....114.1999S. doi:10.1086/118621. ISSN 0004-6256.
  11. ^ 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.
  12. ^ Impey, C. D.; Tapia, S. (October 1988). "New Blazars Discovered by Polarimetry". The Astrophysical Journal. 333: 666. Bibcode:1988ApJ...333..666I. doi:10.1086/166775. ISSN 0004-637X.
  13. ^ Edwards, P. G.; Tingay, S. J. (2004-09-01). "New candidate GHz peaked spectrum and compact steep spectrum sources" (PDF). Astronomy & Astrophysics. 424 (1): 91–106. arXiv:astro-ph/0407010. Bibcode:2004A&A...424...91E. doi:10.1051/0004-6361:20035749. ISSN 0004-6361.
  14. ^ Carter, Steven J. B.; Ellingsen, Simon P.; Macquart, Jean–Pierre; Lovell, James E. J. (2009-07-01). "Annual cycles in the interstellar scintillation time–scales of PKS B1519–273 and PKS B1622–253". Monthly Notices of the Royal Astronomical Society. 396 (3): 1222–1230. arXiv:0903.5384. Bibcode:2009MNRAS.396.1222C. doi:10.1111/j.1365-2966.2009.14824.x. ISSN 0035-8711.
  15. ^ Bartolini, Chiara (October 2023). "Fermi-LAT detection of gamma-ray activity from the BL Lac source PKS 1519-273". The Astronomer's Telegram. 16313: 1. Bibcode:2023ATel16313....1B.
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