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SDSS J1430+2303 (or SDSS J143016.05+230344.4) is a galaxy with an active galactic nucleus that has been claimed to be undergoing a periodic brightness variability that is speeding up. One explanation for the purported behavior is that it could be a supermassive black hole binary. Initial trajectory models suggested the pair could be merging either before the end of 2022 or, alternatively, within three years.[1][2]

SDSS J1430+2303
Observation data (J2000 epoch)
ConstellationBoötes
Right ascension14h 30m 16.04s
Declination+23° 03′ 44.5″
Redshift0.08105
Characteristics
TypeSy
Other designations
PGC 214276, SDSS J143016.05+230344.4, 2MASS J14301603+2303445

Additional observational data published in September 2022 predict the merger to happen within the next three years.[3]


Galaxy


SDSS J1430+2303 is a Seyfert 1 galaxy, an elliptical galaxy with a mass of 150 billion solar masses.[2]

SDSS J1430+2303 is 1.05 × 1022 km from Earth (or 1.11 billion light years, 339 Mpc) with a redshift of 0.08105.[2]

It has an Hα line emission, blue-shifted by 2400 km/s, relative to other emission lines from the galaxy.[2]

An estimate of a supermassive black hole at its center is 40 million solar masses.[2]


References


  1. Clery, Daniel (1 February 2022). "Crash of the titans: imminent merger of giant black holes predicted". www.science.org. 375 (6580).
  2. Jiang, Ning; Yang, Huan; Wang, Tinggui; Zhu, Jiazheng; Lyu, Zhenwei; Dou, Liming; Wang, Yibo; Wang, Jianguo; Pan, Zhen; Liu, Hui; Shu, Xinwen; Zheng, Zhenya (27 January 2022). "Tick-Tock: The Imminent Merger of a Supermassive Black Hole Binary". arXiv:2201.11633.
  3. Dou, Liming; Jiang, Ning; Wang, Tinggui; Shu, Xinwen; Yang, Huan; Pan, Zhen; Zhu, Jiazheng; Tao, An; Zheng, Zhen-Ya; Yanli, Ai (9 September 2022). "X-ray view of a merging supermassive black hole binary candidate SDSS J1430+2303: Results from the first ∼200 days of observations". Astronomy & Astrophysics. 665 (September 2022): 7. arXiv:2208.11968. doi:10.1051/0004-6361/202244450. Retrieved 16 September 2022.


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