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CLASS B1152+199

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CLASS B1152+199
SDSS image of CLASS B1152+199.
Observation data (J2000.0 epoch)
ConstellationLeo
Right ascension11h 55m 18.29s[1]
Declination+19° 39′ 42.23″[1]
Redshift1.018900[1]
Heliocentric radial velocity305,459 km/s[1]
Distance7.737 Gly
Apparent magnitude (V)16.89
Apparent magnitude (B)17.15
Characteristics
TypeQSO[1]
Other designations
2MASSI J1155182+193941, PB 03719, RX J1155.2+1939, TXS 1152+199, OCARS 1152+199[1]

CLASS B1152+199 is a gravitationally lensed quasar[2] located in the constellation of Leo. It has a redshift of (z) 1.018[1] and it was first discovered during the Cosmic Lens All-Sky Survey by astronomers in 1999, alongside CLASS B1359+154.[3]

Description

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CLASS B1152+199 is a double quasar. When imaged, it is found to split into two individual flat radio spectrum components with flux densities of 69.5 and 58.1 mJy, at 8.46 and 14.94 GHz frequencies respectively.[3] A third faint source is found located by 23 arcseconds away from the components, although it is unrelated to them.[3]

The redshift of the lens galaxy of CLASS B1152+199, is (z) 0.439 ± 0.0008 based on absorption line systems measurements at two distinctive redshifts.[3][4] It is either classified as either a late-type or an irregular galaxy according to its R-I band color of 0.80 ± 0.05, with its extinction curve best fitted with a Galactic extinction law.[5] It is also classified as a ghostly damped Lyman-alpha system because of its large amount of cold interstellar medium based on both optical extinction and X-ray absorption measurements.[6] A dust-to-gas ratio for the lens galaxy has been calculated as E(B-V)/NH = (2.5 ± 0.2) x 10-22 mag cm-2 atoms-1 with weak evidence suggested for its X-ray flux ratio.[7]

The lens components of CLASS B1152+199 were analyzed, and the components displayed detections of polarized flux with component A containing a polarization percentage of (2.7 ± 0.1)% at 6.1 GHz and (2.4 ± 0.2)% when observed at 8.6 GHz. Component B on the other hand, has a percentage of (1.9 ± 0.4)% at both frequencies. The rotation measurements of both A and B components are 70 and 560 rad/m2.[8] A model time delay of 60 days has been estimated for the components with the A component passing outside the lens galaxy with the B component passing through it.[5]

CLASS B1152+199 shows a compact core in both of the components. There are also extended jet features in the components.[9] A study published in December 2019, showed the jet in component A is 20 milliarcseconds in extent and appears continuous when observed in Very Long Baseline Array imaging. It is straight, displaying a weak blob extension feature suggesting a counter-jet. The jet in component B on the other hand, has a slight downwards curve unlike the jet in component A with three jet components, however in 2022, this was revealed to be a misalignment.[10][11]

References

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  1. ^ a b c d e f g "NED search results for CLASS B1152+199". NASA/IPAC Extragalactic Database. Retrieved 2025-07-04.
  2. ^ Walton, D. J.; Reynolds, M. T.; Miller, J. M.; Reis, R. C.; Stern, D.; Harrison, F. A. (June 2015). "Broad Iron Emission from Gravitationally Lensed Quasars Observed by Chandra". The Astrophysical Journal. 805 (2): 161. arXiv:1503.05255. Bibcode:2015ApJ...805..161W. doi:10.1088/0004-637X/805/2/161. ISSN 0004-637X.
  3. ^ a b c d Myers, S. T.; Rusin, D.; Fassnacht, C. D.; Blandford, R. D.; Pearson, T. J.; Readhead, A. C. S.; Jackson, N.; Browne, I. W. A.; Marlow, D. R.; Wilkinson, P. N.; Koopmans, L. V. E.; de Bruyn, A. G. (June 1999). "CLASS B1152+199 and B1359+154: Two New Gravitational Lens Systems Discovered in the Cosmic Lens All-Sky Survey". The Astronomical Journal. 117 (6): 2565–2572. arXiv:astro-ph/9905043. Bibcode:1999AJ....117.2565M. doi:10.1086/300875. ISSN 0004-6256.
  4. ^ Muñoz, J. A.; Mediavilla, E.; Falco, E. E.; Oscoz, A.; Barrena, R.; McLeod, B. A.; Abajas, C.; Alcalde, D.; Serra-Ricart, M.; Motta, V. (December 2001). "Subarcsecond Optical Images of the Radio Gravitational Lens B1152+199". The Astrophysical Journal. 563 (2): L107 – L109. Bibcode:2001ApJ...563L.107M. doi:10.1086/338735. ISSN 0004-637X.
  5. ^ a b Toft, S.; Hjorth, J.; Burud, I. (May 2000). "The extinction curve of the lensing galaxy of B1152+199 at z=0.44". Astronomy and Astrophysics. 357: 115–119. arXiv:astro-ph/0003098. Bibcode:2000A&A...357..115T. ISSN 0004-6361.
  6. ^ Dai, Xinyu; Bhatiani, Saloni; Chen, Bin (2020-04-23), "Identifying the lens galaxy B 1152+199 as a ghostly damped Lyman α system by the cosmic origins spectrograph", Monthly Notices of the Royal Astronomical Society, 495: 460–465, arXiv:1612.04848, doi:10.1093/mnras/staa1175, retrieved 2025-07-04
  7. ^ Dai, Xinyu; Kochanek, Christopher S. (2009-02-10). "Differential X-Ray Absorption and Dust-To-Gas Ratios of the Lens Galaxies SBS 0909+523, FBQS 0951+2635, and B 1152+199". The Astrophysical Journal. 692 (1): 677–683. arXiv:0803.1679. Bibcode:2009ApJ...692..677D. doi:10.1088/0004-637x/692/1/677. ISSN 0004-637X.
  8. ^ Edwards, P. G.; Lovell, J. E. J.; Hirabayashi, H.; Jauncey, D. L.; Toft, S. (2001). "The structure of the Gravitational Lens System B1152+199". Publications of the Astronomical Society of Australia. 18 (2): 172–175. Bibcode:2001PASA...18..172E. doi:10.1071/AS01013. ISSN 1323-3580.
  9. ^ Rusin, D.; Norbury, M.; Biggs, A. D.; Marlow, D. R.; Jackson, N. J.; Browne, I. W. A.; Wilkinson, P. N.; Myers, S. T. (February 2002). "High-resolution observations and mass modelling of the CLASS gravitational lens B1152+199". Monthly Notices of the Royal Astronomical Society. 330 (1): 205–211. arXiv:astro-ph/0110099. Bibcode:2002MNRAS.330..205R. doi:10.1046/j.1365-8711.2002.05043.x. ISSN 0035-8711.
  10. ^ Asadi, Saghar; Zackrisson, Erik; Varenius, Eskil; Freeland, Emily; Conway, John; Wiik, Kaj (2019-12-09). "The case against gravitational millilensing in the multiply-imaged quasar B1152+199". Monthly Notices of the Royal Astronomical Society. 492 (1): 742–748. doi:10.1093/mnras/stz3450. ISSN 0035-8711.
  11. ^ Zhang, M; Yuan, Q; Liu, J-Y; Zhang, L (2022-01-13). "Role of the companion lensing galaxy in the CLASS gravitational lens B1152+199". Monthly Notices of the Royal Astronomical Society. 511 (1): 1085–1103. doi:10.1093/mnras/stac087. ISSN 0035-8711.
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