SDSS J1430+2303 explained

SDSS J1430+2303
Epoch:J2000
Constellation Name:Boötes
Dist Ly:339Mpc
Size V:0.41 x 0.24
Type:E/Sy
Size:~130,000 ly (diameter)
Z:0.08105
Names:PGC 214276, SDSS J143016.05+230344.4, 2MASS J14301603+2303445

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, no later than 2025.[1] [2]

The original claim of periodic variations was made in January 2022 in an unrefereed preprint, posted to the ArXiv server, that has not yet been published in a refereed journal as of early 2023. The discovery team later published X-ray observations of the object, finding evidence of strong X-ray variability on timescales of a few days.[3] However, subsequent follow-up observations by two independent groups did not find evidence of continued periodic brightness variations, casting doubt on the binary black hole hypothesis.[4] [5]

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]

Notes and References

  1. Clery . Daniel . Crash of the titans: imminent merger of giant black holes predicted . www.science.org . 1 February 2022 . 375 . 6580 . en.
  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 . Tick-Tock: The Imminent Merger of a Supermassive Black Hole Binary . 27 January 2022 . astro-ph.HE . 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 . 10.1051/0004-6361/202244450 . 2208.11968 . 2022A&A...665L...3D . 251800063 . 16 September 2022.
  4. Dotti . Massimo . Bonetti . Matteo . Rigamonti . Fabio . Bortolas . Elisa . Fossati . Matteo . Decarli . Roberto . Covino . Stefano . Lupi . Alessandro . Franchini . Alessia . Sesana . Alberto . Calderone . Giorgio . Optical follow-up of the tick-tock massive black hole binary candidate . Monthly Notices of the Royal Astronomical Society . January 2023 . 518 . 3 . 4172–4179 . 10.1093/mnras/stac3344 . free . 2023MNRAS.518.4172D. 2205.06275 .
  5. Masterson . Megan . Kara . Erin . Pasham . Dheeraj . D'Orazio . Daniel . Walton . Dominic . Fabian . Andrew . Lucchini . Matteo . Remillard . Ronald . Arzoumanian . Zaven . Burhkonov . Otabek . Choi . Hyeonho . Ehgamberdiev . Shurat . Ferrara . Elizabeth . Guolo . Muryel . Im . Myungshin . Kim . Yonggi . Mirzaqulov . Davron . Paek . Gregory . Sung . Hyun-Il . Yoon . Joh-Na . Unusual Hard X-Ray Flares Caught in NICER Monitoring of the Binary Supermassive Black Hole Candidate AT2019cuk/Tick Tock/SDSS J1430+2303 . The Astrophysical Journal Letters . 14 March 2023 . 945 . 2 . L34 . 10.3847/2041-8213/acbea9 . 2023ApJ...945L..34M. 257220283 . 2299/26129 . free . free .

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