OI 287

OI 287
SDSS image of OI 287
Observation data (J2000.0 epoch)
ConstellationGemini
Right ascension07h 55m 37.03s
Declination+25° 42′ 39.02″
Redshift0.444241
Heliocentric radial velocity133,180 km/s ± 12
Distance4.779 Gly
Apparent magnitude (V)18.04
Apparent magnitude (B)18.50
Characteristics
TypeBLLAC
Size~240,000 ly (73.7 kpc) (estimated)
Other designations
B2 0752+25A, NVSS J075537+254236, SDSS J075537.02+254238.9, THING 587732156852142361, 2MASS J07553702+2542389 LEDA 3506791

OI 287 is a quasar located in the constellation of Gemini. The redshift of the object is (z) 0.444 and it was first discovered as a highly polarized object by astronomers in January 1981, but it also has been classified as a blazar in a 1982 study.

Description

The source of OI 287 has a double-lobed structure based on Very Large Array (VLA) observations made in 1984, however at that time it was unresolved. Radio maps made at 20 and 6 centimeters (cm), would reveal the source has a twin-jet structure, depicted as oscillating. The radio spectrum of the source also has a steep appearance between frequencies of 0.36 and 5 GHz. There is a radio core present with an inverted spectrum between 1.4 and 5 GHz but no variability of its flux density. The core is lowly polarized with polarization levels of only 0.25%.

The host galaxy of OI 287 has a circular appearance with an M-R apparent magnitude of -23.0 based on optical imaging. However a study published in 1998, suggested it has a disk morphology when observed through near-infrared imaging, displaying the presence of radio emission. The host is also described as slightly elongated towards its companion located 4.9 kiloparsecs away from it.

The optical spectrum of OI 287 shows the presence of rich emission lines featuring both narrow and broad Balmer components, as well as detections of doubly ionized oxygen [O III] emission. The optical continuum of the spectrum is found to be increasing sharply towards the near-infrared, but gets flatter at around 10 microns. A broad-line region was located inside the quasar, described as having an obscured appearance, with its accretion disk also likely obscured as well. The mass range of the torus is 105–107 M☉ and the total thickness of the narrow-line region is approximately 2 × 10−8 parsecs. The supermassive black hole located in the center of OI 287 has an estimated mass of 1.46+1.89−0.82 × 109 M☉.

References

  1. 1 2 3 4 5 6 7 8 "NED Search results for OI 287". NASA/IPAC Extragalactic Database. Retrieved 2025-12-25.
  2. ↑ Antonucci, Robert; Kinney, Anne L.; Hurt, Todd (September 1993). "Hubble Space Telescope Ultraviolet Spectroscopy of the Highly Polarized but Quiescent Quasar OI 287". The Astrophysical Journal. 414: 506. Bibcode:1993ApJ...414..506A. doi:10.1086/173098. ISSN 0004-637X.
  3. ↑ Moore, R. L.; Stockman, H. S. (January 1981). "The class of highly polarized quasars : observations and description". The Astrophysical Journal. 243: 60–75. Bibcode:1981ApJ...243...60M. doi:10.1086/158567. ISSN 0004-637X.
  4. 1 2 Saikia, D. J.; Salter, C. J.; Neff, S. G.; Gower, A. C.; Sinha, R. P.; Swarup, G. (1987-09-01). "Radio observations of a few selected blazars" (PDF). Monthly Notices of the Royal Astronomical Society. 228 (1): 203–216. doi:10.1093/mnras/228.1.203. ISSN 0035-8711.
  5. ↑ Wardle, J. F. C.; Moore, R. L.; Angel, J. R. P. (April 1984). "The radio morphology of blazars and relationships to optical polarization and to normal radio galaxies". The Astrophysical Journal. 279: 93–111. Bibcode:1984ApJ...279...93W. doi:10.1086/161868. ISSN 0004-637X.
  6. ↑ Ulvestad, James S.; Antonucci, Robert R. J. (May 1988). "Radio Properties of the Highly Polarized, Quiescent Quasar OI 287". The Astrophysical Journal. 328: 569. Bibcode:1988ApJ...328..569U. doi:10.1086/166314. ISSN 0004-637X.
  7. ↑ Hutchings, J. B.; Crampton, D.; Campbell, B. (May 1984). "Optical imaging of 78 quasars and host galaxies". The Astrophysical Journal. 280: 41–50. Bibcode:1984ApJ...280...41H. doi:10.1086/161966. ISSN 0004-637X.
  8. ↑ Wright, S.C.; McHardy, I.M.; Abraham, R.G.; Crawford, C.S. (June 1998). "Near-infrared imaging of the host galaxies of BL Lacertae objects" (PDF). Monthly Notices of the Royal Astronomical Society. 296 (4): 961–976. Bibcode:1998MNRAS.296..961W. doi:10.1046/j.1365-8711.1998.01463.x. ISSN 0035-8711.
  9. ↑ Rudy, Richard J.; Schmidt, Gary D. (August 1988). "The Nature of the Strong, Static Polarization of the Quasar OI 287". The Astrophysical Journal. 331: 325. Bibcode:1988ApJ...331..325R. doi:10.1086/166557. ISSN 0004-637X.
  10. ↑ Li, Zhenzhen; Zhou, Hongyan; Hao, Lei; Wang, Huiyuan; Ji, Tuo; Shi, Xiheng; Liu, Bo; Zhang, Shaohua; Liu, Wen-Juan; Pan, Xiang; Jiang, Peng (2015-10-12). "Detection of the Intermediate-Width Emission Line Region in Quasar Oi 287 with the Broad Emission Line Region Obscured by the Dusty Torus". The Astrophysical Journal. 812 (2): 99. arXiv:1512.02824. Bibcode:2015ApJ...812...99L. doi:10.1088/0004-637x/812/2/99. ISSN 1538-4357.