{{Short description|BL Lacertae object in the constellation Boötes}} {{Infobox galaxy|name=OQ 530|epoch=[[J2000.0]]|constellation name=[[Boötes]]|ra={{RA|14|19|46.59}}<ref name="ned" />|dec={{DEC|+54|23|14.78}}<ref name="ned" />|z=0.152500<ref name="ned" />|h_radial_v=45,718 [[kilometer per second|km/s]]<ref name="ned" />|dist_ly=1.989 [[light year|Gly]]|appmag_v=15.65|appmag_b=16.17|type=Opt. Var. BLLAC<ref name="ned" />|names=[[2MASS]] J14194660+5423147, 1418+546, CSO 0633, IVS B1418+546, [[NRAO VLA Sky Survey|NVSS]] J141946+542315, PG 1418+546<ref name="ned" />|size=~{{convert|54.44|kpc|ly|abbr=on|lk=on|order=flip}} (estimated){{r|ned}}|image=File:Image of OQ 530.png|caption=The BL Lacertae object OQ 530}}
'''OQ 530''' is a [[BL Lacertae object]]<ref>{{Cite journal |last1=Tagliaferri |first1=G. |last2=Ravasio |first2=M. |last3=Ghisellini |first3=G. |last4=Giommi |first4=P. |last5=Massaro |first5=E. |last6=Nesci |first6=R. |last7=Tosti |first7=G. |last8=Aller |first8=M. F. |last9=Aller |first9=H. D. |last10=Celotti |first10=A. |last11=Maraschi |first11=L. |last12=Tavecchio |first12=F. |last13=Wolter |first13=A. |date=2003-03-01 |title=The BL Lacertae objects OQ 530 and S5 0716+714 - Simultaneous observations in the X-rays, radio, optical and TeV bands |url=https://www.aanda.org/articles/aa/abs/2003/11/aa3234/aa3234.html |journal=Astronomy & Astrophysics |language=en |volume=400 |issue=2 |pages=477–486 |doi=10.1051/0004-6361:20021916 |arxiv=astro-ph/0301117 |bibcode=2003A&A...400..477T |issn=0004-6361}}</ref><ref>{{Cite journal |last1=Barbieri |first1=C. |last2=Cristiani |first2=S. |last3=Romano |first3=G. |date=April 1982 |title=A study of some compact extragalactic objects |url=https://articles.adsabs.harvard.edu/pdf/1982AJ.....87..616B |journal=The Astronomical Journal |language=en |volume=87 |pages=616 |doi=10.1086/113136 |bibcode=1982AJ.....87..616B |issn=0004-6256 |archive-url=http://web.archive.org/web/20240903145426/https://ui.adsabs.harvard.edu/abs/1982AJ.....87..616B/abstract |archive-date=2024-09-03}}</ref><ref>{{Cite journal |last1=Zhang |first1=Bing-Kai |last2=Dai |first2=Ben-Zhong |last3=Zhang |first3=Li |last4=Cao |first4=Zhen |date=2010-06-22 |title=Multi-band optical variability of BL Lac object OQ 530 |url=https://doi.org/10.1088/1674-4527/10/7/004 |journal=Research in Astronomy and Astrophysics |volume=10 |issue=7 |pages=653–662 |doi=10.1088/1674-4527/10/7/004 |bibcode=2010RAA....10..653Z |issn=1674-4527}}</ref> located in the constellation of [[Boötes]]. The [[redshift]] of the object is (z) 0.152<ref name="ned">{{Cite web |title=NED Search results for OQ 530 |url=https://ned.ipac.caltech.edu/byname?objname=3C+454&hconst=67.8&omegam=0.308&omegav=0.692&wmap=4&corr_z=1 |access-date=2025-11-23 |website=NASA/IPAC Extragalactic Database}}</ref> and it was first discovered in 1978 by [[Astronomer|astronomers]] who classified the object to be violently variable based on it displaying optical variations.<ref name=":0">{{Cite journal |last=Miller |first=H. R. |date=July 1978 |title=1418+54: a new, violently variable BL Lacertae object. |url=https://articles.adsabs.harvard.edu/pdf/1978ApJ...223L..67M |journal=The Astrophysical Journal |language=en |volume=223 |pages=L67–L70 |doi=10.1086/182730 |bibcode=1978ApJ...223L..67M |issn=0004-637X}}</ref>
== 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 and minimum|maximum]] peak of 12.5 [[Magnitude (astronomy)|magnitude]].<ref name=":0" /> A brightening phase was detected on the first day of April 1990, followed by a faint state three days later.<ref>{{Cite journal |last1=Carini |first1=M. T. |last2=Miller |first2=H. R. |last3=Goodrich |first3=B. D. |date=August 1990 |title=The timescales of the optical variability of blazars. I - OQ 530 |url=https://articles.adsabs.harvard.edu/pdf/1990AJ....100..347C |journal=The Astronomical Journal |language=en |volume=100 |pages=347 |doi=10.1086/115518 |bibcode=1990AJ....100..347C |issn=0004-6256 |archive-url=http://web.archive.org/web/20240903023640/https://ui.adsabs.harvard.edu/abs/1990AJ....100..347C/abstract |archive-date=2024-09-03}}</ref> It is also said that OQ 530 can be classified as a [[blazar]] due to its variability in the [[electromagnetic spectrum]].<ref>{{Cite journal |last1=Ghosh |first1=K. K. |last2=Ramsey |first2=B. D. |last3=Sadun |first3=A. C. |last4=Soundararajaperumal |first4=S. |date=March 2000 |title=Optical Variability of Blazars |url=https://iopscience.iop.org/article/10.1086/313313/fulltext/ |journal=The Astrophysical Journal Supplement Series |volume=127 |issue=1 |pages=11–26 |doi=10.1086/313313 |bibcode=2000ApJS..127...11G |issn=0067-0049}}</ref>
The host galaxy of OQ 530 is a luminous [[Disc galaxy|disk galaxy]]<ref>{{Cite journal |last1=G. |first1=Abraham, R. |last2=M. |first2=McHardy, I. |last3=S. |first3=Crawford, C. |date=October 1991 |title=Optical imaging of BL Lac host galaxies. |url=https://articles.adsabs.harvard.edu/pdf/1991MNRAS.252..482A |journal=Monthly Notices of the Royal Astronomical Society |language=en |volume=252 |doi=10.1093/mnra |doi-broken-date=23 November 2025 |issn=0035-8711 |archive-url=http://web.archive.org/web/20221107063659/https://ui.adsabs.harvard.edu/abs/1991MNRAS.252..482A/abstract |archive-date=2022-11-07}}</ref><ref name=":1">{{Cite journal |last1=Massaro |first1=E. |last2=Mantovani |first2=F. |last3=Fanti |first3=R. |last4=Maesano |first4=M. |last5=Montagni |first5=F. |last6=Nesci |first6=R. |last7=Sclavi |first7=S. |last8=Tosti |first8=G. |last9=Venturi |first9=T. |date=2004-09-01 |title=VLBI imaging and optical variability of the BL Lac object OQ 530 (B1418+546) |url=https://www.aanda.org/articles/aa/pdf/2004/33/aa0353-04.pdf |journal=Astronomy & Astrophysics |language=en |volume=423 |issue=3 |pages=935–942 |doi=10.1051/0004-6361:20040353 |bibcode=2004A&A...423..935M |issn=0004-6361}}</ref> based on high resolution imaging, with its [[surface brightness]] profile resembling something like a [[lenticular galaxy]].<ref>{{Cite web |title=OQ 530 |url=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 |access-date=2025-11-23 |website=Frankfurt Quasar Monitoring}}</ref><ref>{{Cite journal |last1=Wurtz |first1=Ron |last2=Stocke |first2=John T. |last3=Yee |first3=H. K. C. |date=March 1996 |title=The Canada-France-Hawaii Telescope Imaging Survey of BL Lacertae Objects. I. Properties of the Host Galaxies |url=https://articles.adsabs.harvard.edu/pdf/1996ApJS..103..109W |journal=The Astrophysical Journal Supplement Series |volume=103 |pages=109 |doi=10.1086/192271 |bibcode=1996ApJS..103..109W |issn=0067-0049}}</ref>
The radio structure of the galaxy is compact. When observed with [[Very-long-baseline interferometry|Very Long Baseline Interferometry]] (VLBI), it is found to have a [[Astrophysical jet|radio jet]] extending outwards by 40 [[Minute and second of arc|milliarcseconds]] from the radio core and orientated at a [[position angle]] of 130° by southeast direction.<ref name=":1" /><ref name=":2">{{Cite journal |last1=P. |first1=Cassaro |last2=C. |first2=Stanghellini |last3=M. |first3=Bondi |last4=D. |first4=Dallacasa |last5=R. |first5=della Ceca |last6=A. |first6=Zappalà, R. |date=November 1999 |title=Extended radio emission in BL Lac objects. I. The images |journal=Astronomy and Astrophysics Supplement Series |language=en |volume=139 |issue=3 |pages=601–616 |doi=10.1051/aas:1999511 |arxiv=astro-ph/9910209 |bibcode=1999A&AS..139..601C |issn=0365-0138 }}</ref> 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 (waves)|polarization]].<ref>{{Cite journal |last1=Gabuzda |first1=D. C. |last2=Pushkarev |first2=A. B. |last3=Cawthorne |first3=T. V. |title=1999MNRAS.307..725G Page 725 |url=https://articles.adsabs.harvard.edu/full/1999MNRAS.307..725G |access-date=2025-11-23 |journal=Monthly Notices of the Royal Astronomical Society |date=1999 |volume=307 |issue=3 |page=725 |doi=10.1046/j.1365-8711.1999.02683.x |doi-access=free |bibcode=1999MNRAS.307..725G }}</ref> A hotspot feature with a flat index [[spectrum]] is also present.<ref>{{Cite journal |last1=Baghel |first1=Janhavi |last2=Kharb |first2=P |last3=Hovatta |first3=T |last4=Gulati |first4=S |last5=Lindfors |first5=E |last6=S. |first6=Silpa |date=2023-10-17 |title=A Kpc-scale radio polarization study of PG BL Lacs with the uGMRT |journal=Monthly Notices of the Royal Astronomical Society |volume=527 |issue=1 |pages=672–688 |doi=10.1093/mnras/stad3173 |doi-access=free |issn=0035-8711}}</ref> 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.<ref name=":2" /> 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.<ref>{{Cite journal |last1=Liu |first1=Yi |last2=Li |first2=Juan |last3=Fan |first3=Jun-Hui |date=June 2007 |title=A Possible 456-Day Optical Period of OQ 530 |url=https://iopscience.iop.org/article/10.1088/1009-9271/7/3/07/pdf |journal=Chinese Journal of Astronomy and Astrophysics |volume=7 |issue=3 |pages=380–388 |doi=10.1088/1009-9271/7/3/07 |bibcode=2007ChJAA...7..380L |issn=1009-9271}}</ref>
== References == <references />
== External links == *[https://simbad.cds.unistra.fr/simbad/sim-id?bibyear1=1850&bibyear2=%24currentYear&submit=Display&Ident=%40500237&Name=ICRF+J141946.5%2B542314&bibdisplay=refsum&bibyear1=1850&bibyear2=%24currentYear#lab_bib OQ 530 on SIMBAD]
{{Boötes}} [[Category:BL Lacertae objects]] [[Category:Boötes]] [[Category:Active galaxies]] [[Category:Blazars]] [[Category:Astronomical objects discovered in 1978]]