J2345-0449 Explained

J2345-0449
Epoch:J2000
Constellation Name:Aquarius
Z:0.075566
H Radial V:22,654 km/s
Dist Ly:947 Mly (290.3 Mpc)
Appmag V:0.086
Appmag B:0.113
Sbrightness:16.19
Size V:0.62' x 0.31'
Notes:One of the most massive spiral galaxies containing a radio jet
Names:PGC 1052974, GRS J2345-0449, 2MASX J23453268-0449256, 6dF J2345327-044925

J2345-0449 or 2MASX J23453268-0449256, is a spiral galaxy located 947 million light-years in the constellation of Aquarius.[1] 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.[2] [3] It was discovered in 2014 by amateur astronomers, making it the third spiral DRAGN after ESO 0313-192 and Speca.

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.[4] It is also one of the largest radio sources discovered since the galaxy exhibits two sets of radio lobes found in near alignment and spanning a width of ∼387.2 kpc (∼452) and ∼1.63 Mpc (∼191). According to Very Large Array 6 cm imaging, the inner radio lobes are categorized either 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.[5] It has a mass of Mstellar = 4 × 1011 M⊙ and a surrounding ring of molecular gas measured 24 kpc wide in diameter. The galaxy has a star formation rate with a surface density measured to be ΣSFR = 1.8 × 10−3 M⊙ yr−1 kpc−2.[6] However it has a low factor between 30 and 70 as expected according to the Kennicutt-Schmidt law.[7]

Black hole mass of J2345-0449

The black hole mass estimation is challenging since J2345-0449 has no classic bulge structure. According to Bagchi, the black hole has a mass of 2.5 ± 0.5 × 108 M⊙. Further observations shows it has a mass of 1.4× 109 M⊙ when calculating the MBH–σ relation proposed by Gültekin.[8] However, according to researchers obtaining the M–σ relation from McConnell & Ma,[9] the actual mass of J2345-0449 is 5 × 109 M⊙.

References

  1. Web site: Your NED Search Results . 2024-07-16 . ned.ipac.caltech.edu.
  2. Bagchi . Joydeep . Vivek . M. . Vikram . Vinu . Hota . Ananda . Biju . K. G. . Sirothia . S. K. . Srianand . Raghunathan . Gopal-Krishna . Jacob . Joe . 2014-06-05 . Megaparsec Relativistic Jets Launched from an Accreting Supermassive Black Hole in an Extreme Spiral Galaxy . The Astrophysical Journal . 788 . 2 . 174 . 10.1088/0004-637x/788/2/174 . 0004-637X. 1404.6889 .
  3. Walker . Stephen . 2013-09-01 . Detecting the hot gaseous halo around an extremely massive and relativistic jet launching spiral galaxy . Chandra Proposal . 3824. 2013cxo..prop.3824W .
  4. Posti . Lorenzo . Fraternali . Filippo . Marasco . Antonino . 2019-06-01 . Peak star formation efficiency and no missing baryons in massive spirals . Astronomy and Astrophysics . 626 . A56 . 10.1051/0004-6361/201935553 . 1812.05099 . 2019A&A...626A..56P . 0004-6361.
  5. Walker . S. A. . Bagchi . J. . Fabian . A. C. . 2015-04-09 . A deep Chandra observation of the hot gaseous halo around a rare, extremely massive and relativistic jet launching spiral galaxy . Monthly Notices of the Royal Astronomical Society . 449 . 4 . 3527–3534 . 10.1093/mnras/stv616 . free . 0035-8711. 1411.1930 .
  6. Nesvadba . N. P. H. . Wagner . A. Y. . Mukherjee . D. . Mandal . A. . Janssen . R. M. J. . Zovaro . H. . Neumayer . N. . Bagchi . J. . Bicknell . G. . 2021-10-01 . Jet-driven AGN feedback on molecular gas and low star-formation efficiency in a massive local spiral galaxy with a bright X-ray halo . Astronomy & Astrophysics . en . 654 . A8 . 10.1051/0004-6361/202140544 . 0004-6361. 2103.12816 .
  7. Drevet Mulard . M. . Nesvadba . N. P. H. . Meenakshi . M. . Mukherjee . D. . Wagner . A. . Bicknell . G. . Neumayer . N. . Combes . F. . Zovaro . H. . Janssen . R. M. J. . Bagchi . J. . Dabhade . P. . Prunet . S. . 2023-08-01 . Star formation in a massive spiral galaxy with a radio-AGN . Astronomy and Astrophysics . 676 . A35 . 10.1051/0004-6361/202245173 . 2023A&A...676A..35D . 0004-6361.
  8. Gültekin . Kayhan . Cackett . Edward M. . Miller . Jon M. . Di Matteo . Tiziana. Tiziana Di Matteo (astrophysicist) . Markoff . Sera . Richstone . Douglas O. . 2009-11-01 . The Fundamental Plane of Accretion onto Black Holes with Dynamical Masses . The Astrophysical Journal . 706 . 1 . 404–416 . 10.1088/0004-637X/706/1/404 . 0906.3285 . 2009ApJ...706..404G . 0004-637X.
  9. McConnell . Nicholas J. . Ma . Chung-Pei . 2013-02-01 . Revisiting the Scaling Relations of Black Hole Masses and Host Galaxy Properties . The Astrophysical Journal . 764 . 2 . 184 . 10.1088/0004-637X/764/2/184 . 1211.2816 . 2013ApJ...764..184M . 0004-637X.

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