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J2345-0449 or 2MASX J23453268-0449256, is a spiral galaxy located 947 million light-years in the constellation of Aquarius. It contains an active galactic nucleus and is classified as a radio galaxy, containing relativistic jets that are projected out from its spiral host by ~1.6 Mpc, making these jets the largest and rarest known to date. It was first discovered in 2014 by Bagchi and other amateur astronomers.

Physical Properties
Mentioned as a megaparsec-scale object at redshift 0.0757, J2345-0449 is one of the massive spiral galaxies found in the universe. It is also one of the largest radio sources discovered since the galaxy exhibits two sets of radio lobes found nearly aligned together and span over ∼387.2 kpc (∼452) and ∼1.63 Mpc (∼191) wide respectively. According to Very Large Array 6 cm imaging, the inner radio lobes are categorized either of Fanaroff-Riley Class I or FR II morphology.

J2345-0449 contains a fast rotation speed of Vrot = 371/sin (i) = 429 ± 30 km s−1 that is r ≥ 10 kpc away from its galactic center. It has a stellar mass of Mstellar = 4 × 1011 M⊙ and a surrounding ring of molecular gas measured 24 kpc wide in diameter. The galaxy has an average star formation rate with its surface density measured as ΣSFR = 1.8 × 10−3 M⊙ yr−1 kpc−2. However it has a lower factor between 30 and 70 as expected according to the Kennicutt-Schmidt law.

Black hole mass of J2345-0449
The black hole mass estimation is found to be challenging since J2345-0449 has no classical bulge structure. According to Bagchi, the black hole has a mass of 2.5 ± 0.5 × 108 M⊙ but further observations shows it has a mass of 1.4× 109 M⊙ when using an MBH–σ relation proposed by Gültekin. However, according to researchers who obtained the M–σ relation from McConnell & Ma, the actual black hole mass in J2345-0449 is 5 × 109 M⊙.