Jump to content

QSO B1524-136

Add links
From Wikipedia, the free encyclopedia
QSO B1524-136
The quasar QSO B1524-136.
Observation data (J2000.0 epoch)
ConstellationLibra
Right ascension15h 26m 59.44s[1]
Declination−13° 51′ 00.26″[1]
Redshift1.687000[1]
Heliocentric radial velocity505,750 km/s[1]
Distance9.952 Gly
Apparent magnitude (V)20.5
Characteristics
TypeOpt var, RLQ[1]
Notable featuresTwo-sided jet
Other designations
PKS B1524-136, OR -140, LEDA 2828423, Cul 1524-136, PAPER J231.68-13.79, NVSS J152659-135100[1]

QSO B1524-136 is a quasar located in the constellation of Libra. It has a redshift of (z) 1.687[1] and it was first identified by astronomers from the Parkes Observatory in 1966.[2] The object is classified as a compact steep spectrum source (CSS)[3] and is noted for its two-sided radio jet.[4]

Description

[edit]

QSO B1524-136 is a radio-loud AGN.[5] It has a radio spectrum that appears as steep but also flat.[6] M. Bondi classifies the source as variable at low frequencies although no significant variations in flux density have been detected.[7][4][8] The supermassive black hole mass for this object is estimated to be 9.52 Mʘ based on assumptions of absorption lines.[9]

The radio structure of QSO B1524-136 is quite compact. Observations with Very Long Baseline Interferometry (VLBI) showed, its structure as elongated at 45° while a double structure imaged by Very Large Array A-array showed it as double.[8][3] When imaged by MERLIN at 5 GHz, the structure has two main components located in north and south directions, with the former having a high peak brightness. A radio image taken by MK2 VLBI, found it having a bright northern hotspot and a jet connecting from the radio core to the hotspot. This jet is estimated to have a width of 7 milliarcseconds and a length of 35 milliarcseconds. A low radio emission gap can also be seen between the core and the jet's start point.[4] Very Long Baseline Array (VLBA) also detected the same jet, displaying a series of knots. They appeared to be bend by 40° before entering the hotspot region. A counter-jet was also detected by VLBA, making QSO B1524-136 having two jets on each side of its nucleus.[4][10]

Polarization has been observed in several jet regions of QSO B1524-136. However its rotation measure value changes as the jet travels from one region to the next. This change might be explained by an external screen whose magnetic field orientation varies along with the jet, in the way rotation measure variations are reproduced.[11] A large rotation measure has been found for its strong northern component, with a value of 20,411 rad m-2.[12]

References

[edit]
  1. ^ a b c d e f g "NED search results for QSO B1524-136 (PKS B1524-136)". NASA/IPAC Extragalactic Database. Retrieved 2025-05-25.
  2. ^ Shimmins, A. J.; Day, G. A.; Ekers, R. D.; Cole, D. J. (1966). "The Parkes Catalogue Of Radio Sources Declination Zone 0° To ?20°". Australian Journal of Physics. 19 (6): 837. Bibcode:1966AuJPh..19..837S. doi:10.1071/ph660837. ISSN 0004-9506.
  3. ^ a b Mantovani, F.; Junor, W.; Fanti, R.; Padrielli, L.; Saikia, D. J. (December 1994). "Gaseous cocoons around compact steep spectrum sources". Astronomy and Astrophysics. 292: 59–66. Bibcode:1994A&A...292...59M. ISSN 0004-6361.
  4. ^ a b c d Mantovani, F.; Saikia, D. J.; Bondi, M.; Junor, W.; Salter, C. J.; Ricci, R. (2002-07-01). "B1524-136: A CSS quasar with two-sided radio jets" (PDF). Astronomy & Astrophysics. 389 (1): L15 – L19. arXiv:astro-ph/0205111. Bibcode:2002A&A...389L..15M. doi:10.1051/0004-6361:20020697. ISSN 0004-6361.
  5. ^ Best, P. N.; Lehnert, M. D.; Miley, G. K.; Rottgering, H. J. A. (2003-07-21). "Red galaxy overdensities and the varied cluster environments of powerful radio sources with z 1.6". Monthly Notices of the Royal Astronomical Society. 343 (1): 1–21. arXiv:astro-ph/0304035. Bibcode:2003MNRAS.343....1B. doi:10.1046/j.1365-8711.2003.06667.x. ISSN 0035-8711.
  6. ^ Steppe, H.; Jeyakumar, S.; Saikia, D. J.; Salter, C. J. (November 1995). "Millimeter-wavelength observations of compact steep-spectrum sources". Astronomy and Astrophysics Supplement Series. 113: 409. ISSN 0365-0138.
  7. ^ Bondi, M.; Padrielli, L.; Fanti, R.; Ficarra, A.; Gregorini, L.; Mantovani, F. (November 1996). "A 15 years monitoring program at 408MHz". Astronomy and Astrophysics Supplement Series. 120: 89–98. doi:10.1051/aas:1996276. ISSN 0365-0138.
  8. ^ a b Mantovani, F.; Junor, W.; Fanti, R.; Padrielli, L.; Browne, I. W. A.; Muxlow, T. W. B. (July 1992). "Obervations at arcsecond resolution of steep-spectrum sources which vary at low frequencies". Monthly Notices of the Royal Astronomical Society. 257 (2): 353–367. doi:10.1093/mnras/257.2.353. ISSN 0035-8711.
  9. ^ Decarli, R.; Falomo, R.; Treves, A.; Kotilainen, J. K.; Labita, M.; Scarpa, R. (March 2010). "The quasar MBH-Mhost relation through cosmic time - I. Data set and black hole masses". Monthly Notices of the Royal Astronomical Society. 402 (4): 2441–2452. arXiv:0911.2983. Bibcode:2010MNRAS.402.2441D. doi:10.1111/j.1365-2966.2009.16048.x. ISSN 0035-8711.
  10. ^ Mantovani, F.; Bondi, M.; Saikia, D. J.; Junor, W.; Salter, C. J.; Ricci, R. (2003). "Two-Sided Radio Jets in B1524-136". Publications of the Astronomical Society of Australia. 20 (1): 85–87. Bibcode:2003PASA...20...85M. doi:10.1071/AS02054. ISSN 1323-3580.
  11. ^ Mantovani, F.; Junor, W.; Ricci, R.; Saikia, D. J.; Salter, C.; Bondi, M. (2002-07-01). "Milli-arcsecond scale rotation measure in the CSS quasars 0548+165 and 1524-136" (PDF). Astronomy & Astrophysics. 389 (1): 58–67. arXiv:astro-ph/0203338. Bibcode:2002A&A...389...58M. doi:10.1051/0004-6361:20020482. ISSN 0004-6361.
  12. ^ Mantovani, F.; Rossetti, A.; Junor, W.; Saikia, D. J.; Salter, C. J. (2013-07-01). "Radio polarimetry of compact steep spectrum sources at sub-arcsecond resolution". Astronomy & Astrophysics. 555: A4. arXiv:1305.1644. Bibcode:2013A&A...555A...4M. doi:10.1051/0004-6361/201220769. ISSN 0004-6361.
[edit]
Retrieved from "https://en.wikipedia.org/w/index.php?title=QSO_B1524-136&oldid=1292234484"