Astronomy:OQ 530

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OQ 530
The BL Lacertae object OQ 530
Observation data (J2000.0 epoch)
ConstellationBoötes
Right ascension 14h 19m 46.59s[1]
Declination+54° 23′ 14.78″[1]
Redshift0.152500[1]
Helio radial velocity45,718 km/s[1]
Distance1.989 Gly
Apparent magnitude (V)15.65
Apparent magnitude (B)16.17
Characteristics
TypeOpt. Var. BLLAC[1]
Size~177,600 ly (54.44 kpc) (estimated)[1]
Other designations
2MASS J14194660+5423147, 1418+546, CSO 0633, IVS B1418+546, NVSS J141946+542315, PG 1418+546[1]

OQ 530 is a BL Lacertae object[2][3][4] located in the constellation of Boötes. The redshift of the object is (z) 0.152[1] and it was first discovered in 1978 by astronomers who classified the object to be violently variable based on it displaying optical variations.[5]

Description

OQ 530 is extremely variable, with several outbursts being displayed between 1915 and 1942. Its most prominent outburst was in 1938, when the object underwent a series of violent changes in brightness levels, reaching a maximum peak of 12.5 magnitude.[5] A brightening phase was detected on the first day of April 1990, followed by a faint state three days later.[6] It is also said that OQ 530 can be classified as a blazar due to its variability in the electromagnetic spectrum.[7]

The host galaxy of OQ 530 is a luminous disk galaxy[8][9] based on high resolution imaging, with its surface brightness profile resembling something like a lenticular galaxy.[10][11]

The radio structure of the galaxy is compact. When observed with Very Long Baseline Interferometry (VLBI), it is found to have a radio jet extending outwards by 40 milliarcseconds from the radio core and orientated at a position angle of 130° by southeast direction.[9][12] The jet structure is mainly complex with an outer component that broadens upon reaching a distance of four milliarcseconds. There are three other components and a compact radio core which displays signs of polarization.[13] A hotspot feature with a flat index spectrum is also present.[14] Another component is found west from the core with an elongated appearance. Faint radio emission is also surrounding it, indicating a halo feature is present.[12] A 456-day optical period is suggested for the galaxy, which might be accounted for by either a binary black hole or a helical jet.[15]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "NED Search results for OQ 530". https://ned.ipac.caltech.edu/byname?objname=3C+454&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1. 
  2. ↑ Tagliaferri, G.; Ravasio, M.; Ghisellini, G.; Giommi, P.; Massaro, E.; Nesci, R.; Tosti, G.; Aller, M. F. et al. (2003-03-01). "The BL Lacertae objects OQ 530 and S5 0716+714 - Simultaneous observations in the X-rays, radio, optical and TeV bands" (in en). Astronomy & Astrophysics 400 (2): 477–486. doi:10.1051/0004-6361:20021916. ISSN 0004-6361. Bibcode: 2003A&A...400..477T. https://www.aanda.org/articles/aa/abs/2003/11/aa3234/aa3234.html. 
  3. ↑ Barbieri, C.; Cristiani, S.; Romano, G. (April 1982). "A study of some compact extragalactic objects" (in en). The Astronomical Journal 87: 616. doi:10.1086/113136. ISSN 0004-6256. Bibcode: 1982AJ.....87..616B. https://articles.adsabs.harvard.edu/pdf/1982AJ.....87..616B. 
  4. ↑ Zhang, Bing-Kai; Dai, Ben-Zhong; Zhang, Li; Cao, Zhen (2010-06-22). "Multi-band optical variability of BL Lac object OQ 530". Research in Astronomy and Astrophysics 10 (7): 653–662. doi:10.1088/1674-4527/10/7/004. ISSN 1674-4527. Bibcode: 2010RAA....10..653Z. https://doi.org/10.1088/1674-4527/10/7/004. 
  5. ↑ 5.0 5.1 Miller, H. R. (July 1978). "1418+54: a new, violently variable BL Lacertae object." (in en). The Astrophysical Journal 223: L67–L70. doi:10.1086/182730. ISSN 0004-637X. Bibcode: 1978ApJ...223L..67M. https://articles.adsabs.harvard.edu/pdf/1978ApJ...223L..67M. 
  6. ↑ Carini, M. T.; Miller, H. R.; Goodrich, B. D. (August 1990). "The timescales of the optical variability of blazars. I - OQ 530" (in en). The Astronomical Journal 100: 347. doi:10.1086/115518. ISSN 0004-6256. Bibcode: 1990AJ....100..347C. https://articles.adsabs.harvard.edu/pdf/1990AJ....100..347C. 
  7. ↑ Ghosh, K. K.; Ramsey, B. D.; Sadun, A. C.; Soundararajaperumal, S. (March 2000). "Optical Variability of Blazars". The Astrophysical Journal Supplement Series 127 (1): 11–26. doi:10.1086/313313. ISSN 0067-0049. Bibcode: 2000ApJS..127...11G. https://iopscience.iop.org/article/10.1086/313313/fulltext/. 
  8. ↑ G., Abraham, R.; M., McHardy, I.; S., Crawford, C. (October 1991). "Optical imaging of BL Lac host galaxies." (in en). Monthly Notices of the Royal Astronomical Society 252. doi:10.1093/mnra. ISSN 0035-8711. https://articles.adsabs.harvard.edu/pdf/1991MNRAS.252..482A. 
  9. ↑ 9.0 9.1 Massaro, E.; Mantovani, F.; Fanti, R.; Maesano, M.; Montagni, F.; Nesci, R.; Sclavi, S.; Tosti, G. et al. (2004-09-01). "VLBI imaging and optical variability of the BL Lac object OQ 530 (B1418+546)" (in en). Astronomy & Astrophysics 423 (3): 935–942. doi:10.1051/0004-6361:20040353. ISSN 0004-6361. Bibcode: 2004A&A...423..935M. https://www.aanda.org/articles/aa/pdf/2004/33/aa0353-04.pdf. 
  10. ↑ "OQ 530". http://quasar.square7.ch/fqm/1418+546.html#:~:text=Telescope%20shows%20the%20host%20galaxy%20as%20an%20elongated%20disk%20galaxy%20(image%20inverted)&text=OQ%20530%20is%20a%20radio%20loud%20object,,as%20such,%20it%20has%20been%20catalogued%20by. 
  11. ↑ Wurtz, Ron; Stocke, John T.; Yee, H. K. C. (March 1996). "The Canada-France-Hawaii Telescope Imaging Survey of BL Lacertae Objects. I. Properties of the Host Galaxies". The Astrophysical Journal Supplement Series 103: 109. doi:10.1086/192271. ISSN 0067-0049. Bibcode: 1996ApJS..103..109W. https://articles.adsabs.harvard.edu/pdf/1996ApJS..103..109W. 
  12. ↑ 12.0 12.1 P., Cassaro; C., Stanghellini; M., Bondi; D., Dallacasa; R., della Ceca; A., Zappalà, R. (November 1999). "Extended radio emission in BL Lac objects. I. The images" (in en). Astronomy and Astrophysics Supplement Series 139 (3): 601–616. doi:10.1051/aas:1999511. ISSN 0365-0138. Bibcode: 1999A&AS..139..601C. 
  13. ↑ Gabuzda, D. C.; Pushkarev, A. B.; Cawthorne, T. V. (1999). "1999MNRAS.307..725G Page 725". Monthly Notices of the Royal Astronomical Society 307 (3): 725. doi:10.1046/j.1365-8711.1999.02683.x. Bibcode: 1999MNRAS.307..725G. https://articles.adsabs.harvard.edu/full/1999MNRAS.307..725G. Retrieved 2025-11-23. 
  14. ↑ Baghel, Janhavi; Kharb, P; Hovatta, T; Gulati, S; Lindfors, E; S., Silpa (2023-10-17). "A Kpc-scale radio polarization study of PG BL Lacs with the uGMRT". Monthly Notices of the Royal Astronomical Society 527 (1): 672–688. doi:10.1093/mnras/stad3173. ISSN 0035-8711. 
  15. ↑ Liu, Yi; Li, Juan; Fan, Jun-Hui (June 2007). "A Possible 456-Day Optical Period of OQ 530". Chinese Journal of Astronomy and Astrophysics 7 (3): 380–388. doi:10.1088/1009-9271/7/3/07. ISSN 1009-9271. Bibcode: 2007ChJAA...7..380L. https://iopscience.iop.org/article/10.1088/1009-9271/7/3/07/pdf. 



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