LBQS 1009-0252
| LBQS 1009-0252 | |
|---|---|
 SDSS image of LBQS 1009-0252. | |
| Observation data (J2000.0 epoch) | |
| Constellation | Sextans |
| Right ascension | 10h 12m 15.80s |
| Declination | −03° 07′ 02.00″ |
| Redshift | 2.739000 |
| Heliocentric radial velocity | 821,132 km/s |
| Distance | 10.941 Gly |
| Apparent magnitude (V) | 18.71 |
| Apparent magnitude (B) | 18.82 |
| Characteristics | |
| Type | QSO |
| Other designations | |
| 2MASSI J1012158-030702, QSO B1009-252, 2MASS J10121588-0307031 | |
LBQS 1009-0252 also QSO 1009-252 or Q1009-0252, is a gravitationally-lensed quasar[1] located in the constellation of Sextans. It has a redshift of (z) 2.73[2] and it was first discovered by J. Surdej in February 1994[3] and later described a close-separation quasar pair with magnitudes of 18.2 and 21.2 by a team of astronomers lead by P.C. Hewitt, the same year.[4]
Description
[edit]LBQS 1009-0252 consists of two bright quasars labelled A and B, having a separation gap of 1.53 ± 0.01 arcseconds. When imaged, they are separated into two components and lensed by an elliptical galaxy located at a redshift of (z) 0.871, confirmed by Very Large Telescope observations who found it closer to the fundamental plane redshift measurement calculated by C.S. Kochanek.[4][5][6] A third quasar labelled C, is found at (z) 1.627 although it is fainter and possibly not relating to the pair.[4][7][8] Observations determined the host galaxy of C is mainly responsible for the dominant cosmic shear contribution based on modelling of a isothermal ellipsoid although external shearing is contributed based on a isothermal sphere model by Claeskens with an orientation in the position angle of 11 ± 6 degrees.[9][10]
Ground-based observations and by Hubble Space Telescope have showed LBQS 1009-0252 has time-delays. Based on results, the time delay is found approximately 120.8 h-165 with the A component shown as the leading component based on estimation of the lens galaxy's redshift. Multicolor photometric light curves also showed both the A and B components of the quasars, do display some variations with the B component brightening up and the A component becoming slightly dimmer. This suggests a switch in the blue part of the spectrum in one of the quasars.[5]
Several absorption line systems have been identified in both A and B components of the quasars.[4] When investigated, astronomers found these absorption lines are found rich in magnesium and iron oxides with redshifts of (z) 0.869 and (z) 1.627. Further evidence also pointed out the magnesium absorption system is extended by 40 h50-1 kiloparsecs, coinciding with the third quasar which in turn further extends outwards from it by 45 h50-1 kiloparsecs.[4] More emission lines at (z) 2.739 and 2.740 are also discovered.[5]
References
[edit]- ^ Walton, D. J.; Reynolds, M. T.; Miller, J. M.; Reis, R. C.; Stern, D.; Harrison, F. A. (2015-05-29). "BROAD IRON EMISSION FROM GRAVITATIONALLY LENSED QUASARS OBSERVED BYCHANDRA". The Astrophysical Journal. 805 (2): 161. arXiv:1503.05255. Bibcode:2015ApJ...805..161W. doi:10.1088/0004-637x/805/2/161. ISSN 1538-4357.
- ^ "NED search results for LBQS 1009-0252". NASA/IPAC Extragalactic Database. Retrieved 2025-06-15.
- ^ Refsdal, S.; Surdej, J. (February 1994). "Gravitational lenses". Reports on Progress in Physics. 57 (2): 117–185. Bibcode:1994RPPh...57..117R. doi:10.1088/0034-4885/57/2/001. ISSN 0034-4885.
- ^ a b c d e Hewett, P. C.; Irwin, M. J.; Foltz, C. B.; Harding, M. E.; Corrigan, R. T.; Webster, R. L.; Dinshaw, N. (November 1994). "The Close-Separation Gravitational Lens Candidate Q1009-0252". The Astronomical Journal. 108: 1534. Bibcode:1994AJ....108.1534H. doi:10.1086/117174. ISSN 0004-6256.
- ^ a b c Claeskens, J.-F.; Khmil, S. V.; Lee, Dong Wook; Sluse, D.; Surdej, J. (March 2001). "HST and ground-based observations of the gravitational lens system Q1009-0252 A & B" (PDF). Astronomy and Astrophysics. 367 (3): 748–758. Bibcode:2001A&A...367..748C. doi:10.1051/0004-6361:20000491. ISSN 0004-6361.
- ^ Ofek, Eran O.; Maoz, Dan; Rix, Hans-Walter; Kochanek, Christopher S.; Falco, Emilio E. (2006-04-10). "Spectroscopic Redshifts for Seven Lens Galaxies". The Astrophysical Journal. 641 (1): 70–77. arXiv:astro-ph/0510465. Bibcode:2006ApJ...641...70O. doi:10.1086/500403. ISSN 0004-637X.
- ^ Lehar, J.; Falco, E. E.; Kochanek, C. S.; McLeod, B. A.; Munoz, J. A.; Impey, C. D.; Rix, H.-W.; Keeton, C. R.; Peng, C. Y. (2000-06-20). "Hubble Space Telescope Observations of 10 Two-Image Gravitational Lenses". The Astrophysical Journal. 536 (2): 584–605. arXiv:astro-ph/9909072. Bibcode:2000ApJ...536..584L. doi:10.1086/308963. ISSN 0004-637X.
- ^ Basu, D. (December 2009). "Close separation triple system QSO 1009-0252 with discordant redshifts: Is the spectrum of one component blueshifted?". Journal of Astrophysics and Astronomy. 30 (3–4): 133–143. Bibcode:2009JApA...30..133B. doi:10.1007/s12036-009-0014-9. ISSN 0250-6335.
- ^ Faure, C.; Alloin, D.; Kneib, J. P.; Courbin, F. "A search for clusters and groups of galaxies on the line of sight towards 8 lensed quasars | Astronomy & Astrophysics (A&A)" (PDF). Astronomy & Astrophysics. 428 (3): 741–755. doi:10.1051/0004-6361:20040406. ISSN 0004-6361.
- ^ Leier, Dominik; Ferreras, Ignacio; Saha, Prasenjit; Falco, Emilio E. (2011-10-04). "Resolving the Baryon-Fraction Profile in Lensing Galaxies". The Astrophysical Journal. 740 (2): 97. arXiv:1102.3433. Bibcode:2011ApJ...740...97L. doi:10.1088/0004-637x/740/2/97. ISSN 0004-637X.
